List of Kamen Rider Fourze characters

Gentaro Kisaragi (如月 弦太朗, Kisaragi Gentarō) is a second-year, later third-year, student at Amanogawa High School, who has a bad-boy image due to his delinquent yankee fashion sense yet is very sociable and willing to take big risks in making friends with almost everyone he comes across. He also has a special handshake he does with his friends and is commonly used whenever Gentaro makes a new friend. When he meets Kengo Utahoshi on his first day at AGHS, it starts the chain of events leading to him becoming Kamen Rider Fourze and the formation of the school's Kamen Rider Club. Eventually, his club grows in members as does his array of Switches to utilize as he eventually faces off against the Horoscopes which they learn is under the control of the school chairman Mituaki Gamou. After Gamou's defeat, promising to meet the Presenters in the chairman's stead, Gentaro reforms the Kamen Rider Club into the Space Kamen Rider Club with the intent to befriend everyone in the universe.

By 2017 in the future timeline of Movie War Ultimatum, after the events of Heisei Generations Final, Gentaro became an AGHS teacher and new advisor of the Kamen Rider Club whose sole member is Miyoko Ohkiwhile encountering the Monster League whom are being manipulated by a criminal named Banba who is working with the Akumaizer trio. Reunited with his school mates, Gentaro manages to win Saburo's trust by destroying the Fourze Driver to convince the youth that he can change. Though this allowed Saburo become Inazuman and defeat Banba, Gentaro pursues Eel to 2012 alongside Kamen Riders Meteor and Nadeshiko. Borrowing the Fourze Driver from his past self in his third year, Gentaro aids Kamen Rider Wizard in defeating the Akumaizers while creating a paradox where he possesses the Fourze Engage Ring that made their team up possible.

The Fourze System was originally developed by Rokuro Utahoshi from reverse-engineering the Presenters' Core Switch to create a spacesuit that harnesses a mysterious form of energy called Cosmic Energy (コズミックエナジー, Kozumikku Enajī). Rokuro was inspired by his visit to Kyoto and used a hypothetical system its occupants used in ancient times in designing the Fourze after the Four Chinese constellations as reflected in the specific symbols on the Kamen Rider's limbs: Byakko (白虎, Circle), Suzaku (朱雀, Cross), Seiryū (青竜, Triangle), and Genbu (玄武, Square). Mituaki Gamou compares Fourze's power to that of a gravitational lens, particularly on how the Kamen Rider influences both Astroswitches and Zodiarts Switches. The message that Rokuro left behind also reveals the driving force behind the Fourze System are the bonds of friendship, making Gentaro the only one who can bring out the technology's full potential.

When Gentaro places the Fourze Driver (フォーゼドライバー, Fōze Doraibā) belt on with four Astroswitches placed in Switch Sockets (スイッチソケット, Suitchi Soketto) while flipping Transwitches (トランスイッチ, Toransuitchi), he pushes the Enter Lever (エンターレバー, Entā Rebā) on the side of the belt, transforming into Fourze in his default Base States (ベースステイツ, Bēsu Suteitsu). After transforming into Kamen Rider Fourze, Gentaro shouts "Space, here I come!" (宇宙キター！, Uchū kitā!) and says "Kamen Rider Fourze, Let's settle this once and for all!" (仮面ライダーフォーゼ、タイマン張らせてもらうぜ！, Kamen Raidā Fōze, Taiman harasete morau ze!) before battle. While this form usually uses Rocket, Launcher, Drill, and Radar Switches, he can switch each with other Astroswitches in different combinations via the Modules on his armlets and anklets. He can push the Enter Level for his Limit Break (リミットブレイク, Rimitto Bureiku) finishers, with his usual attack being the Rider Rocket Drill Kick (ライダーロケットドリルキック, Raidā Roketto Doriru Kikku) while using the Rocket and Drill Modules simultaneously and its Rider Rocket Drill Space Kick (ライダーロケットドリル宇宙キック, Raidā Roketto Doriru Uchū Kikku) variant. When pushing the lever a second time, Kamen Rider Fourze can perform the Rider Rocket Drill Big Space Kick (ライダーロケットドリル大宇宙キック, Raidā Roketto Doriru Dai Uchū Kikku) Double Limit Break, where the auras around the Rocket and Drill Modules are enlarged and allowing Kamen Rider Fourze to bore through things his initial Limit Break could not before. But it exhausts the Cosmic Energy of the Rocket and Drill Switches rendering them inactive until they are recharged.

1. Rocket (ロケット, Roketto, Circle): The Rocket Switch arms Kamen Rider Fourze with the Rocket Module on his right arm. The exhaust thrusters at the end of the rocket add power to his Rider Rocket Punch (ライダーロケットパンチ, Raidā Roketto Panchi) attack. While capable of adjusting the exhaust's power at will, he cannot turn off the exhaust once turned on, until either finishing a Limit Break or deactivating the switch. First used in Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals.
2. Launcher (ランチャー, Ranchā, Cross): The Launcher Switch arms Kamen Rider Fourze with the Launcher Module on his right leg, allowing him to launch a series of five missiles to attack an enemy. However, if Kamen Rider Fourze is not using the Radar Module to lock on or at least have some idea where to direct the missiles, the flight pattern of the missiles will be erratic.
3. Drill (ドリル, Doriru, Triangle): The Drill Switch arms Kamen Rider Fourze with the Drill Module on his left leg, arming him with a drill that can spin at 200 RPM, fast enough to pierce through enemies and through the ground. This is often Fourze's go-to Module, once using it on its own to execute the Rider Drill Kick (ライダードリルキック, Raidā Doriru Kikku) attack.
4. Radar (レーダー, Rēdā, Square): The Radar Switch arms Kamen Rider Fourze with the Radar Module on his left arm, allowing him to reflect certain waves of energy and usually used as a communicator to contact the Rabbit Hatch or the Astroswitch Kaban, ringing whenever there is an incoming call from them. It can also be used to give the other Modules homing capabilities. First used in Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals.
5. Magic Hand (マジックハンド, Majikkuhando, Circle): The Magic Hand Switch arms Kamen Rider Fourze with the Magic Hand Module, arming him with a manipulator arm that can extend up to 10 meters (33 ft) and pick up heavy objects using the End Effect Pinch (エンドエフェクトペンチ, Endo Efekuto Pinchi) claw. First used in Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals.
6. Camera (カメラ, Kamera, Square): The Camera Switch arms Kamen Rider Fourze with the Camera Module on his left arm, allowing him to view far distances. It can also receive data from the environment nearby. This Astroswitch is generally used to operate the Burgermeal Foodroid, though it is implied there are other Burgermeals being used for lookout without the use of the Camera Switch. Also, the capabilities of the Module is greater than that of the Camera Switch in a Burgermeal.
7. Parachute (パラシュート, Parashūto, Square): The Parachute Switch arms Kamen Rider Fourze with the Parachute Module on his left arm, allowing him to use three parachutes to land safely on the ground during free-fall from a significant height. When the parachutes are not in use, they are stored in the box on Kamen Rider Fourze's arm.
8. Chainsaw (チェーンソー, Chēnsō, Cross): The Chainsaw Switch arms Kamen Rider Fourze with the Chainsaw Module on his right leg, allowing him to use the saw on his foot that has a powerful engine that can rotate the blade up to 15,000 RPM, allowing his kicks to deal devastating cuts. Because the blade is on the foot, maneuverability is an issue to make sure Kamen Rider Fourze does not cut himself.
9. Hopping (ホッピング, Hoppingu, Triangle): The Hopping Switch arms Kamen Rider Fourze with the spring-loaded Hopping Module on his left leg, allowing him to significantly increase the jumping height, from 20 meters (66 ft) to 40 meters (130 ft). However, it is difficult to control and is ineffective in closed spaces.
10. Elek (エレキ, Ereki, Circle): The Elek Switch enables Fourze to utilize electricity while transforming him inti his gold-armored Elek States (エレキステイツ, Ereki Suteitsu) form with use of the Billy The Rod (ビリーザロッド, Birī Za Roddo) nightstick. Initially, it just changes his right forearm's color to gold and arms him with his weapon before suffering backlash shock from the power due to Gentaro's unfamiliarity with the Switch's States-changing powers. But following Gentaro's experience in befriending JK, he idea of "befriending" the Elek Switch by accepting all its qualities enables him to transform without any unwanted side-effects. In addition to the Limit Breaks performed solely through Billy The Rod like the Rider 10 Billion Volt Break (ライダー100億ボルトブレイク, Raidā Hyaku Oku Boruto Bureiku), Rider 10 Billion Volt Shoot (ライダー100億ボルトシュート, Raidā Hyaku Oku Boruto Shūto), and Rider 10 Billion Volt Burst (ライダー100億ボルトバースト, Raidā Hyaku Oku Boruto Bāsuto), Elek States can also perform a Rider Kick called the Rider Lightning Drill Kick (ライダー電光ドリルキック, Raidā Denkō Doriru Kikku), allowing Kamen Rider Fourze to use both the Billy The Rod and the Drill Module on his target.
11. Scissors (シザース, Shizāsu, Square): The Scissors Switch arms Kamen Rider Fourze with the Scissors Module on his left arm, which allows him to cut through even metal. In the opening sequence of the television series, it is shown firing a pulse of energy for a long-range attack. This Astroswitch is generally used to operate the Potechokin Foodroid.
12. Beat (ビート, Bīto, Cross): The Beat Switch arms Kamen Rider Fourze with the Beat Module on his right leg, a large speaker that can produce sonic waves with a range of 20 Hz-5 kHz and a tweeter with a range of 5 kHz-24 kHz.
13. Chainarray (チェーンアレイ, Chēn'arei, Circle): The Chainarray Switch arms Kamen Rider Fourze with the Chainarray Module on his right arm. The heavy ball on the end of the chain called the Blowing Star (ブローイングスター, Burōingu Sutā) weighs about 120 kg. The Rough Spikers (ラフスパイカー, Rafu Supaikā) are made from a newly discovered metal known as Astorium (アストリウム, Asutoriumu). It seems old-fashioned and low-tech, but it was created using space development technology nonetheless, and deals heavy damage when thrown. Like any chained weapon, inertia is a factor to make sure Kamen Rider Fourze does not end up smacking the Module into himself, and there is also the chance of the Module being reflected back onto Kamen Rider Fourze.
14. Smoke (スモーク, Sumōku, Cross): The Smoke Switch arms Kamen Rider Fourze with the Smoke Module on his right leg, allowing him to emit smoke within a 5-meter radius for 5 minutes to obstruct a target's vision in close combat, as well as disorient said target from the choking smoke. It can easily backfire on him and has his vision clouded instead should he get caught in the smoke emitted himself.
15. Spike (スパイク, Supaiku, Triangle): The Spike Switch arms Kamen Rider Fourze with the Spike Module on his left leg, giving Kamen Rider Fourze an advantage in close-range kicks. The Spike Module consists of Rough Spikers, again made out of Astorium, only they extend seconds before impact for maximum damage. It is also quite heavy, as Kamen Rider Fourze has to use both arms to lift his leg out of a foot-deep hole speculated to be caused by the Spike Module when it is first activated, which happens off-screen.
16. Winch (ウインチ, Uinchi, Square): The Winch Switch arms Kamen Rider Fourze with the drum-style Winch Module on his left arm, which has a spinning turbine. The Winch Module's Boost Hooker (ブーストフッカー, Būsuto Hukkā) shoots out at high speed and can pull objects with up to 5 tons.
17. Flash (フラッシュ, Furasshu, Circle): The Flash Switch arms Kamen Rider Fourze with the Flash Module on his right arm, allowing Kamen Rider Fourze to blind enemies (or anybody else for that matter, including himself) with the light of the sun. This Astroswitch is generally used to operate the Hulashake Foodroid.
18. Shield (シールド, Shīrudo, Square): The Shield Switch arms Kamen Rider Fourze with the shuttle-like Shield Module on his left arm, allowing Kamen Rider Fourze to block or deflect any enemy attacks, although it is rather small in size. The Shield Module is also made from Astorium.
19. Gatling (ガトリング, Gatoringu, Triangle): The Gatling Switch arms Kamen Rider Fourze with the Gatling Module on his left leg, allowing Kamen Rider Fourze to shoot 10 rounds per second. The bullets have enough power to pierce into concrete.
20. Fire (ファイヤー, Faiyā, Circle): The Fire Switch enables Fourze to utilize heat while transforming him inti his red-armored Fire States (ファイヤーステイツ, Faiyā Suteitsu) with use of the Hee-Hackgun (ヒーハックガン, Hī Hakkugan) firearm, which has a flamethrower-like Flame Gun Mode (火炎モード, Kaen Mōdo, Flame Mode) and an extinguisher-like Quench Gun Mode (消火モード, Shōka Mōdo, Extinguisher Mode). Gentaro's experience with the Elek Switch and befriending Tomoko allowed to easily access Fire States. While in Fire States, Fourze can also absorb all thermal energy and release it in his Rider Exploding Shoot (ライダー縛熱シュート, Raidā Bakunetsu Shūto) Limit Break.
21. Stealth (ステルス, Suterusu, Cross): The Stealth Switch arms Kamen Rider Fourze with the Stealth Module on his right leg, allowing Kamen Rider Fourze to turn invisible for five-seconds when activated, and can easily be activated again by merely stomping his foot on the ground. The looks of the module was based on the design of Lockheed Martin X-33, an aborted experimental suborbital space plane developed in the 90's. It works by absorbing reflected light off of the Fourze System.
22. Hammer (ハンマー, Hanmā, Square): The Hammer Switch arms Kamen Rider Fourze with the Hammer Module on his left arm, arming him with a powerful hammer-like weapon.
23. Water (ウォーター, Wōtā, Triangle): The Water Switch arms Kamen Rider Fourze with the Water Module on his left leg, which looks like a tap, enabling him to shoots highly pressurized blasts of water at a target.
24. Medical (メディカル, Medikaru, Square): The Medical Switch arms Kamen Rider Fourze with the Medical Module on his left arm, which allows him access to special medicine created by Cosmic Energy to cure anomalies in a human body. It also used in by transmitting waves with medicinal effect into an ill person.
25. Pen (ペン, Pen, Cross): The Pen Switch arms Kamen Rider Fourze with the Pen Module on his right leg, which is a brush that can materialize writings in solid form with metallic hardness with its ink, such as impromptu shields that can absorb energy blasts or a powerful whip attached to the brush. A Limit Break using the Pen Module allows Fourze to use a series of kicks splashing ink all over anything it hits.
26. Wheel (ホイール, Hoīru, Triangle): The Wheel Switch arms Kamen Rider Fourze with the Wheel Module on his left leg, which allows him to dash at high speeds without the need for the Machine Massigler.
27. Screw (スクリュー, Sukuryū, Triangle): The Screw Switch arms Kamen Rider Fourze with the Screw Module on his left leg, allowing him to propel himself underwater.
28. Hand (ハンド, Hando, Cross): The Hand Switch arms Kamen Rider Fourze with the Hand Module on his right leg, allowing him to utilize another manipulator arm that functions like an extra hand, attending to some tasks while Fourze's attention is required by something else.
29. Schop (スコップ, Sukoppu, Circle): The Schop Switch is used to operate the Horuwankov Foodroid. It also arms Kamen Rider Fourze with the Schop Module on his right arm.
30. N Magnet (Ｎマグネット, Enu Magunetto, Circle): The N Magnet Switch arms Fourze with the N Magnet Module on his right arm in unison with the S Magnet Switch, which initially prove difficult to use until they were integrated in the NS Magphone (NSマグフォン, Enu Esu Magufon) cellphone for better control while it doubles as an alternate means for Gentaro to communicate with the Rabbit Hatch and the Astroswitch Kaban, instead of relying on the Radar Module. The NS MagPhone enables Fourze to utilize electromagnetic energies while transforming him into his silver-armored Magnet States (マグネットステイツ, Magunetto Suteitsu) with use of the shoulder-mounted N Magnet Cannon (Ｎマグネットキャノン, Enu Magunetto Kyanon) and S Magnet Cannon (Ｓマグネットキャノン, Esu Magunetto Kyanon) railguns, which he can link up into the NS Magnet Cannon (NSマグネットキャノン, Enu Esu Magunetto Kyanon) for his Rider Super Electromagnetic Bomber (ライダー超電磁ボンバー, Raidā Chōdenji Bonbā) Limbit Break that compresses the target with destructive magnetic force.
31. S Magnet (Ｓマグネット, Esu Magunetto, Square): The S Magnet Switch arms Kamen Rider Fourze with the S Magnet Module on his left arm in unison with the N Magnet Switch. However, the two Magnet Switches prove to have a really powerful magnetic pull and are later integrated into the Magphone for better control. Fourze can use the S Magnet Switch on its own while loaning the N Magnet Switch to Meteor for their Rider Super Electromagnetic Strike (ライダー超電磁ストライク, Raidā Chōdenji Sutoraiku) team attack.
32. Freeze (フリーズ, Furīzu, Cross): The Freeze Switch is used to operate the Softonya Foodroid. It also arms Kamen Rider Fourze with the refrigerator-like Freeze Module on his right leg, which emits super-cold vapors that can freeze any liquid.
33. Claw (クロー, Kurō, Circle): The Claw Switch arms Kamen Rider Fourze with the Claw Module on his right arm, which has claws that can slice through anything.
34. Board (ボード, Bōdo, Triangle): The Board Switch arms Kamen Rider Fourze with the Board Module on his left leg, producing a sliding board that can travel on any surface.
35. Giant-foot (ジャイアントフット, Jaiantofutto, Cross): The Giant-foot Switch arms Kamen Rider Fourze with the Giant-foot Module on his right leg, allowing him to focus and amplify gravity at a certain point to bring opponents down, by stomping his foot on the ground. An enlarged mirage of the Giant-foot Module appears above the opponent as a side effect, making Kamen Rider Fourze seem like he is mentally creating a construct of Cosmic Energy to crush his opponents.
36. Aero (エアロ, Earo, Triangle): The Aero Switch arms Kamen Rider Fourze with the Aero Module on his left leg, allowing him to suck in large quantities of air so that Fourze can expel the pressurized air at a target to disorient it.
37. Gyro (ジャイロ, Jairo, Square): The Gyro Switch is used to operate the Nuggegyroika Foodroid. It also arms Kamen Rider Fourze with the Gyro Module on his left arm, creating a large fan that can allow Kamen Rider Fourze to hover. While the Rocket Module serves the same purpose and is much faster, Kamen Rider Fourze has more utility and control with the Gyro Module.
38. Net (ネット, Netto, Cross): The Net Switch arms Kamen Rider Fourze with the Net Module on his right leg, allowing him to create a large electromagnetic net to trap his target within.
39. Stamper (スタンパー, Sutanpā, Triangle): The Stamper Switch arms Kamen Rider Fourze with the Stamper Module on his left leg, allowing him to perform a pile driver kick that stamps the Kamen Rider Club's logo on the opponent. The logo detonates several seconds after being applied as a secondary attack, with Fourze being able to control the time until detonation.
40. Cosmic (コズミック, Kozumikku, Circle): When all 39 Astroswitches are completed, the detonator-like Cosmic Switch manifests to allow Kamen Rider Fourze to transform into his electric blue-covered ultimate form Cosmic States (コズミックステイツ, Kozumikku Suteitsu). Fourzed absorbed the other Astroswitches at the moment of his transformation, freely using their power by accessing the touch screen on his Switching Lung (スイッチングラング, Suitchingu Rangu) and using most Cicle Astrowitches in conjunction with his space shuttle-shaped Barizun Sword (バリズンソード, Barizun Sōdo). The Barizun's Sword's club-like Boost Mode (ブーストモード, Būsuto Mōdo) enables Fourze to perform a warp drive, while its Sword Mode (ソードモード, Sōdo Mōdo) allows him to channel Cosmic Energy for attacks which include his Rider Super Galaxy Finish (ライダー超銀河フィニッシュ, Raidā Chō Ginga Finisshu) Limit Break. The Cosmic Switch functions on a powerful bond of friendship and Gentaro's faith in hi forged friendships to maintain Cosmic States while giving him added protection from the effects of Horoscopes Zodiarts even when in civilian form. Fourze can also use a Rider Kick Limit Break with his right leg rather than with the left.

During the events of Movie War Mega Max, before gaining Magnet States, Gentaro acquires the S-Rocket (ロケットスーパーワン, Roketto Sūpā Wan, Circle) from Nadeshiko which allows him to transform into the orange-colored Rocket States (ロケットステイツ, Roketto Suteitsu) with two Rocket Modules on his arms. This States had shown to perform two Limit Breaks, both of which are Rider Kicks. The default Limit Break is the Rider Tailspin Crusher (ライダーきりもみクラッシャー, Raidā Kirimomi Kurasshā), which has two variations, a blow with two Rocket Modules and a corkscrew kick. With the Drill Module, Fourze can pull off the Rider Double Rocket Drill Kick (ライダーダブルロケットドリルキック, Raidā Daburu Roketto Doriru Kikku), which is a stronger version of Base States' Rider Rocket Drill Kick. In the aftermath, some of the excess Cosmic Energy from the conflict briefly consolidated into the Clear Drill (クリアドリル, Kuria Doriru, Triangle), which Fourzes uses to Rocket and Drill Modules to create the Rocket Drill Module and transform him into Rocket Drill States.

During the events of Kamen Rider Fourze The Movie: Everyone, Space is Here!, Fourze acquire the Fusion (フュージョン, Fyūjon, Square) which was created by the energies of the Astroswitches channeling through each of the people that have been affected by Gentaro's presence. The Fusion Switch serves as a catalyst, Fourze first using it with the Meteor (メテオ, Meteo, Circle) Switch to transform into the purple-armored Meteor Fusion States (メテオフュージョンステイツ, Meteo Fyūjon Suteitsu). In this State, able to use the Clear Launcher (クリアランチャー, Kuria Ranchā, Cross) and Clear Drill Astroswitches and the Barizun Sword while able to use Meteor's Meteor Galaxy and Jeet Kune Do fighting style, Fourze uses the Rider Fusion Drill Kick (ライダーフュージョンドリルキック, Raidā Fyūjon Doriru Kikku). Fourze later uses the Nadeshiko (なでしこ, Cross) during the events of Movie War Ultimatum to transform into Meteor Nadeshiko Fusion States (メテオなでしこフュージョンステイツ, Meteo Nadeshiko Fyūjon Suteitsu) with two silver Rocket Missile Modules on his arms and Hovering Lifter (ホバリングリフター, Hobaringu Rifutā) on his legs to glide around at high speeds. Two Limit Break finishers for Meteor Nadeshiko Fusion States are the Rider (Double) Rocket Missile (ライダー（ダブル）ロケットミサイル, Raidā (Daburu) Roketto Misairu), where Kamen Rider Fourze launches a Rocket Module (or both Rocket Modules) at the enemy, and the Rider Ultimate Crusher (ライダーアルティメットクラッシャー, Raidā Arutimetto Kurasshā), a stronger version of Rocket States' Rider Tailspin Crusher. Meteor Nadeshiko Fusion States appears in Kamen Rider × Kamen Rider Wizard & Fourze: Movie War Ultimatum.

Gentaro Kisaragi is portrayed by Sota Fukushi (福士 蒼汰, Fukushi Sōta). As a child, Gentaro is portrayed by Tatsuki Ishikawa (石川 樹, Ishikawa Tatsuki).

Kengo Utahoshi (歌星 賢吾, Utahoshi Kengo) is a second-year and Gentaro's partner who is also very level-headed and intelligent. However, he has a strange medical condition that causes sharp pains whenever he overexerts himself. A year prior to the series' start, Kengo receives an anonymous letter along with an Astroswitch. The portal connecting to the Rabbit Hatch lunar base, which is all that remains of the OSTO complex on the moon, is opened in a locker in an abandoned club activity room when Kengo just so happens to throw the activated Switch inside. Inside the base, he discovers existence of the Zodiarts and Astroswitches, motivating him to follow through with his father's plans to fight the menace that is to come. Though he originally intends to fight the Zodiarts on his own, his physique is so weak that even manning the Powerdizer exo-suit for extended periods is an extremely difficult task for him. He is forced to give Gentaro the means to become Kamen Rider Fourze and aid the Kamen Rider by providing him with his arsenal as well as acting as Gentaro's tactician. However, Kengo does not acknowledge the existence of the Kamen Rider Club and refuses to be a member of the club. He later changes his mind when he is trapped on the moon due to the mistaken actions of Mr. Ohsugi, and becomes Gentaro's friend and an official member of the club. Though Gentaro's antics still irk him somewhat, he is later seen to be more willing to put up with Gentaro's seemingly stupid plans as he proceeds to create more Astroswitches for him to use.

In his third year, having finished the Cosmic Switch, Kengo learns that Tachibana is the one who gave him the Gate Switch as he begins to learn more of his father from Emoto and Gamou during his trip to Kyoto. Eventually, Kengo learns that Emoto is both the Virgo Zodiarts and Tachibana as he reveals to the boy the full story behind his father's death and that the Horoscopes must be stopped from having all twelve switches. During the incident with the Gemini Zodiarts that followed, Gamou noticed a power emitting from Kengo. From the contents of Emoto's flash drive, Kengo learns of his true nature as the Core Child (コアチャイルド, Koa Chairudo), a physical construct made of Cosmic Energy from within the Core Switch which the Presenters sent to OSTO to prove humanity's worth to contact them. However, only his adopted father Rokuro Utahoshi knew the truth with Kuniteru Emoto, who regretted his role, bringing Kengo to Earth. He uses this newfound knowledge to awaken his powers to negate the 12 Horoscopes Switches, thwarting Gamou's plan to seek the Presenter. However, becoming emotionless to make his next action less painful as he can now use the Fourze Driver, Kengo reveals his true nature to his friends in the Kamen Rider Club that he must leave Earth to present what he has learned to the Presenters' home world. However, Gentaro sees through Kengo's facade and convinces him that he is still a person while promising him that they would meet again. Unfortunately, refusing to let him leave the Milky Way, Kengo's departure is interfered by Gamou assuming his Sagittarius Nova form to knock the youth down and destroy the Core Switch, causing Kengo's body to dissolve into particles of light. However, on the verge of death, Gamou uses the Aquarius Switch's power to repair the Core Switch and bring Kengo back to life.

Kengo is named after Kamen Rider 1, also known as Takeshi Hongo (本郷 猛, Hongō Takeshi); うたほしけんご（歌星賢吾） is an anagram of ほんごうたけし（本郷猛）.[6]

Kengo Utahoshi is portrayed by Ryuki Takahashi (高橋 龍輝, Takahashi Ryūki).

Yuki Jojima (城島 ユウキ, Jōjima Yūki) is a second-year student and is Gentaro's childhood friend with a bright and cheerful personality who cares deeply for her friends. As a child, Yuki heard a voice from the stars which influenced her with the desire to become an astronaut. Since then, Yuki became what she refers to as a "space otaku", called a "geek" by everyone else, with her dream motivating her reasons for attending Amanogawa High and occasionally going to the JAXA building after school. She is a friend of Kengo's, meeting him on the day he found the Rabbit Hatch out of her interest to know his father better, and has since supported him in his activities in preparation for the Zodiarts' appearance. She plays a role in Gentaro becoming Fourze and allows Kengo to let Gentaro help them, becoming one of the founding members of the Kamen Rider Club.

During her third-year, Yuki became the Kamen Rider Club's new president after Miu graduated and is capable of leading the club with her ingenuity through Miu's return as the club's chairwoman makes Yuki a figurehead leader. Yuki also has a plushy satellite toy she affectionately calls "Hayabusa", which seems to have different facial expressions depending on the situation. During the incident with the Gemini Zodiarts, an embodiment of her darkness who ruins her life, Yuki finds herself ceasing to be before Gentaro saves her.

Yuki is named after Riderman, also known as Joji Yuki (結城 丈二, Yūki Jōji).[6]

Yuki Jojima is portrayed by Fumika Shimizu (清水 富美加, Shimizu Fumika). As a child, Yuki is portrayed by Kanon Kasuga (春日 香音, Kasuga Kanon).

Miu Kazashiro (風城 美羽, Kazashiro Miu) is a cocky third-year, later graduate, student who comes from an upper-class family. She is also the head cheerleader and has been elected the "Queen of the School" (学園の女王, Gakuen no Joō) for having won the yearly Queen Festival (クイーンフェス, Kuīn Fesu) two years in a row putting a lot of effort and hard work into getting where she is now, and has a large number of fans. Among her philosophies as queen, Miu believes that she needs to know everything that occurs within the school grounds. Though she is well-loved by many in school, Miu has a sense of superiority over the student body and sees those who are infatuated with her to be nothing but leeches, as to her, they only leech onto her for their own failure to shine. She takes an immediate dislike to Gentaro and calls him trash when she first meets him. This mentality is later used against her by her sidekick Tamae Sakuma during this year's Queen Festival, as Tamae had secretly recorded Miu destroying her adoring public's gifts and have the video played in front of the entire student body. Humbled, and with Gentaro's help, Miu is reminded of her passion and returns to compete in the Festival despite the odds against her. Soon after, she accepts Gentaro's hand in friendship and manages to win the Queen Festival yet again and keep her title, as well as the love of the student body in general with a powerful speech about working hard to shine with one's own power. Soon after, as her way to let Gentaro off the hook on the bet they made prior to the contest, Miu has him bring her to the Rabbit Hatch. Miu is made a member of the Kamen Rider Club, much to Yuki's chagrin when Miu announces that she is the club president. The position fits her well as she is a born leader and capable of being level-headed under crisis, even more so than Kengo himself, shown where she is capable of keeping cool and speak confidently even when a Zodiarts is terrorizing the place around her, and when she stops Yuki from revealing details about their club to save Kengo when he got trapped on the moon, never forgetting that their primary role is to stop the Zodiarts. These traits make her the team's de facto leader, as she is constantly seen mobilizing the team and helping to direct strategies and actions alongside Kengo. While she keeps her elitist attitude (used more towards a comedic effect), she also becomes genuinely more caring towards others, especially with her fellow Kamen Rider Club Members and would go to lengths for their sake, even if it means doing field work and getting herself really dirty. Miu has a strange habit of saying "oops" when making a mistake or if something strange happens.

Realizing that she and Shun would soon be graduating, she contemplates her activities in the Kamen Rider Club and chooses Yuki to be the next president when she is gone. After seeing the work she has put into the group when finding out about the Coma Zodiarts, she realizes not only has she made the right choice, but that she would soon leave the club seeing how everyone can handle themselves without her. Upsetting herself over this, she directs her fury at Shun who desperately attempts to ask her out to prom when she wants to ask Gentaro, instead. She gets her wish to dance with Gentaro due to Shun's insistence and realizes that though she is leaving the high school, she will always be a part of the Kamen Rider Club. After graduating, she finds out that her college is close to AGHS so she can continue her Kamen Rider Club activities as chairwoman. This effectively returns the leadership of the club to her, and thus rendering Yuki's appointment moot and the "Club President" title rendered empty. In the end, Shun proposes to her but is soon enamored by a ring from a mysterious man.

Miu is named after Kamen Rider V3, also known as Shiro Kazami (風見 志郎, Kazami Shirō); かざしろみう（風城美羽） is an anagram of かざみしろう（風見志郎）.[6]

Miu Kazashiro is portrayed by Rikako Sakata (坂田 梨香子, Sakata Rikako).

Kaizo Jingu (神宮 海蔵, Jingū Kaizō), known better by his nickname JK (JK（ジェイク）, Jeiku, pronounced as "Jake"), is student who has a gaudy appearance and acts as an information broker to other students, but he only trades secrets for favors. However, he is known to be a coward as he constantly flees from difficult situations. Prior to attending AGHS, JK had dreams of becoming a rock musician like his father since he was a child and formed a rock band with Tojiro Goto called Gene Goto. However, while in middle school, JK was forced to give up on his dream upon learning that he lacks the vocal talent for it. During his first year in AGHS, JK learned of Gentaro's identity as Kamen Rider Fourze, agreeing to keep his mouth shut about it prior to talking Gentaro into protecting him from Fumihiro Nitta, a student he wronged by tricking him into being his bodyguard. Seeing the power of the Astroswitches in action personally, JK arranges the theft of the Elek Switch from Gentaro to teach him a lesson in trusting people, as well as to have him stick around in case Nitta comes for him again. However, once found out, JK is held captive by Nitta who allows him to call for help on the promise to release him if even one of his associates came to his aid. Though none came, Gentaro arrived to save JK despite his betrayal. The experience Gentaro learned from befriending someone like JK, to both the pros and cons of a person, allows him to assume Elek States. After JK learns what friendship really means, he is made a member of the Kamen Rider Club and uses his connections to aid the group in identifying Zodiarts' Switchers and their targets through his connections. When Miu and Shun graduate, JK is named the new pilot of the Powerdizer through the process of elimination (Kengo and Ryusei are tech support and Yuki and Tomoko are too weak to use it). While he proves to have a talent in piloting the heavy machine, his lack of experience and lasting stamina prevents him from piloting effectively. Luckily, as his college is near AGHS, Shun returns to the club to continue his role as the Powerdizer pilot, but mostly coaches JK in his new duties. JK is also known to be a skilled breakdancer, which is especially noted during the fight with the Pegasus Zodiarts when he successfully uses his moves to dodge a powerful kick. He also incorporates that same style whenever he pilots the Powerdizer.

During his second year in AGHS, JK creates the alias of DJ Gene to set up an internet radio show called DJ Gene Milky Night Carnival as a means to live out his dream of becoming a rock star, but the show becomes more popular than he expects. He is also reunited with middle school friend Tojiro Goto, but becomes conflicted between his loyalties to his old friend who is one of the Horoscopes and to his new friends in the Kamen Rider Club. Goto urges JK to continue with the show, using his sonic powers as the Capricorn Zodiarts to make them even more popular since it makes their musical skills better than before. JK's internal conflicts continue when he discovers the Capricorn Zodiarts' powers are brainwashing everyone in the school, but he does not want to be like his father who gave up on his dreams, so he keeps the show running and leaves the Kamen Rider Club due to his new-found understanding on the frailty of friendship and wants to live for his future instead. However, after seeing Gentaro stopping the Capricorn Zodiarts's music with his father's song, and being forgiven for his role in his former friend's scheme, JK ends his broadcast and dream with the intent to cherish the friendships he has with the Kamen Rider Club.

JK is named after Kamen Rider X, also known as Keisuke Jin (神 敬介, Jin Keisuke); "JK" are Jin's initials.[6] JK's real name is also a play on Kamen Rider X being a "Kaizorg" (カイゾーグ, Kaizōgu).

JK is portrayed by Shion Tsuchiya (土屋 シオン, Tsuchiya Shion). As a child, JK is portrayed by Wataru Sekine (関根 航, Sekine Wataru).

Shun Daimonji (大文字 隼, Daimonji Shun) is a third-year, later graduate, student who is captain of the American Football team, thus treated like a king by the student body. He is a stereotypical jock whose life has been planned out by his father, raised to believe that those under him are trash and how to play them to suit his needs. As he is consciously compelled not to shame his father and their family name, Shun distances himself from anything that he thinks could destroy his reputation, as he does with Miu when she fell from grace during the Queen Festival. Though he tries to reconcile with her, Shun is surprised when Miu breaks up with him and starts hanging out with Gentaro and his friends. He later gets forced into Mr. Satake's detention class for attacking one of his teammates who insulted his leadership abilities. Though he resolves to pass so he can return to his club activities, Shun's attempts to keep the Kamen Rider Club members in the class eventually result with him being labelled as a delinquent by Mr. Satake as well. Gentaro's earnest effort in wanting to know him better eventually gets through to Shun, and he reveals in tears that he only wants to live up to his father's expectations, without being truly happy with who he is and what he has achieved. Furthermore, his holier-than-thou attitude only makes him an outcast of sorts and he confesses his envy towards the Kamen Rider Club members, where the members stick together and have real fun. His story moved Gentaro to tears to his surprise. Although Gentaro respects his wish to live up to his father's expectations, he tells him that he should also do what he truly wants to. This compels Shun to accept Gentaro as a friend and later battle alongside Gentaro, joining the Kamen Rider Club and providing his athletic prowess as the Powerdizer's official pilot. He is proven to be very adept at manning the machine as he even can do acrobatics with it without suffering any detrimental side effects. He is seen to be more humble and friendly after befriending Gentaro, willingly help the club with anything. He is also very uncomfortable confronting his old attitude, especially when others are following his old example, and attempts to atone for his previous ways like straightening out his teammates when they are acting like he used to, and out of guilt for pushing Miura over the edge, tries to bring Miura back to school by visiting him and apologize to him personally over and over again, even though his apologies always fall on deaf ears.

When Shun and Miu are graduating, Shun insists on asking Miu to prom in very outlandish ways revealing that he has true feelings for her. However, he finds out the Miu wants to go to prom with Gentaro and becomes upset over this, even throwing a punch at Gentaro who went out of his way to get Miu to go with Shun to prom. While dancing with Miu, he realizes that the Kamen Rider Club are fighting to protect their prom and finds it hard to sit with that fact and just enjoy themselves, prompting him and Miu to leave the prom early to assist them. Afterward, he insists that Gentaro dance with Miu like she wanted to, as Shun wants to send her off happy. After graduation, Shun finds out that both his and Miu's college is near AGHS, allowing both of them to continue their duties in the Kamen Rider Club, thus graduating only from high school and not the club. Eventually, after the defeat of the Horoscopes, Shun attempts to ask Miu for her hand in marriage before the moment is ruined by the appearance of a mysterious young man.

Shun is named after Kamen Rider 2, also known as Hayato Ichimonji (一文字 隼人, Ichimonji Hayato); by combining the kanji 一 and 人 in Ichimonji's name, you get the kanji 大 in Daimonji's name.[6]

Shun Daimonji is portrayed by Justin Tomimori (冨森 ジャスティン, Tomimori Jasutin).

Tomoko Nozama (野座間 友子, Nozama Tomoko) is a first-year, later second-year, goth girl who works at the Witches' Sacrifice occult store after school. Always seen with an iPad, Tomoko has a weird laugh and fixates over weird things, going so far as to delete the school's database because her bow is crooked when photos of her doing school activities were taken, "Earning" her a place in Mr. Satake's detention class. Tomoko also has an acute sixth sense in sensing things others cannot, along with moving around undetected and giving people chills whenever she is around. Her unorthodox thinking always allows her to notice things that most people usually overlook. She is also capable of detecting energies of the Astroswitches. She is revealed to have knowledge of the urban legends of other Kamen Riders, playing an indirect role in the creation of the Kamen Rider Club. Since watching Yuki perform at the Queen Festival, seeing a kindred spirit in her, Tomoko has begun to stalk her. Before she joins the Kamen Rider Club, she is one of the few students to be aware of the existence of the Rabbit Hatch, but she does not know at the time that it is located on the Moon where she wishes to live on. Eventually, Tomoko joins a group of other goth students in a witches' coven called the Lunar Witches as its leader Ritsuko Usaka offers to make her dream of leaving the Earth to live on the Moon a reality. But she is devastated when she finds out that the Lunar Witches are shams, which leads Tomoko to be approached by the Scorpion Zodiarts to receive a Zodiarts Switch. Believing she has nowhere to go except the Moon, and that her Zodiarts Switch may fulfill her dreams and become a new person, Gentaro takes her to the Rabbit Hatch to show her what the moon really looks like. Although she is disappointed there is nothing but cold space, Tomoko is glad that she has finally gone to the Moon while finding comfort and acceptance in the Kamen Rider Club members, especially Gentaro as he tells her she is just fine as she currently is. This leads to her renouncing her membership with the Lunar Witches and accepting Gentaro's hand in friendship while later, much to Kengo's chagrin, throws her yet-to-be activated Zodiarts Switch into the river near school. She becomes uncomfortable with occults, something unusual for a goth, after her experience with the Luna Witches. As a Kamen Rider Club member, Tomoko mainly uses her sixth sense to help out with investigations and detect things the others overlook. She starts to keep notes on Ryusei as she realizes strange things happen to him. Ryusei loses her trust at first for betraying the club and she tells him that he is not a true Kamen Rider. At the end, she sees Ryusei redeeming himself without the power of the Meteor Driver. Once the Aries Zodiarts is defeated, Ryusei regains her trust. At the end of Episode 40, Tomoko is banished to the Dark Nebula after she discovers that the Virgo Zodiarts is actually Professor Kuniteru Emoto but is soon brought back after revealing himself to the other club members.

Tomoko is named after Kamen Rider Amazon, also known as Amazon (アマゾン); "Nozama" is "Amazon" backwards.[6]

Tomoko Nozama is portrayed by Shiho (志保).

Ryusei Sakuta (朔田 流星, Sakuta Ryūsei) is a mysterious young man who attended Subaruboshi High School (昴星高校, Subaruboshi Kōkō),[Note 2] and later on transfers to AGHS in Gentaro's class. He is initially part of the Anti-Zodiarts Union (反ゾディアーツ同盟, Han Zodiātsu Dōmei) and fights as Kamen Rider Meteor (仮面ライダーメテオ, Kamen Raidā Meteo).

Ryusei's friend Jiro Iseki foolishly used a Zodiarts Switch, which self-destructed and rendered him in a coma afterward. Ryusei never forgave himself for being unable to prevent his friend's injury and afterward vowed to never make friends. He receives the Meteor System equipment from Tachibana and the mission to find the Aries Zodiarts soon after Jiro's hospitalization. Ryusei as Kamen Rider Meteor first appears in a post-credits scene of Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max, defeating the remaining members of Foundation X under Lem Kannagi while wondering if the Aries Zodiarts will be at Amanogawa High School. Once transferred to AGHS, his Kamen Rider alter ego had a rocky start with Kamen Rider Fourze. Ryusei sought to join the Kamen Rider Club in order to observe them for Tachibana. Initially, Ryusei acts timid and runs away in the face of danger in order to hide his true identity, a farce that led to Gentaro Kisaragi only letting Ryusei join the club after briefly expressing his true feelings. As a Kamen Rider Club member, Ryusei helped in assisting Kengo in the creation of several Astroswitches and the NS Magphone. Eventually, learning that the Aries Zodiarts has been at Subaruboshi High the entire time, Ryusei loses his focus and his desire to save Jiro results with him protecting the Horoscopes member while nearly killing Gentaro with a one-inch punch to the chest. With his identity as Kamen Rider Meteor exposed as a result, the Aries Zodiarts honoring his promise to revive, Ryusei learns Jiro's condition is worsening and is guilt-ridden of his actions. As a result, Ryusei nearly gets himself killed before Gentaro arrives and fully accepts him as his friend. After the Aries Zodiarts is defeated, Ryusei is forgiven by the rest of Kamen Rider Club as they agree to help keep his identity secret. However, Ryusei later learns that Tachibana is Emoto, the Horoscopes' Virgo Zodiarts who has been secretly acting against his group. Though Emoto is killed off, he had set the M-BUS on automatic to Ryusei can transform freely. After Sagittarius Nova's defeat, Ryusei returns to Subaruboshi High.

Five years later, during the events of Movie War Ultimatum, Ryusei became an Interpol agent alongside Inga Blink, a fellow Seishin Dairin Fist he encountered while with the Kamen Rider Club. While on a mission, Ryusei learns of Gamou's former associate Banba and returns to Japan to enlist Gentaro's help. Though Banba is brought to justice, Ryusei learns of the Akumaizer trio and accompanies Gentaro and Nadeshiko to the past to help the Kamen Riders defeat the monsters.

By himself, Ryusei is a proficient martial artist, often yelling very much like the martial artist Bruce Lee did, right down to the trademark Howatchā (ホワッチャーッ) when firing his punches or kicks. His fighting style is the Seishin Dairin Fist (星心大輪拳, Seishin Dairinken, Star-Mind Large-Ring Fist)[Note 3] style, Jeet Kune Do. As Kamen Rider Meteor, Ryusei uses the Meteor Driver (メテオドライバー, Meteo Doraibā) to transform once using the Meteor (メテオ, Meteo) Astroswitch. One of the conditions of using the Meteor System is to keep Kamen Rider Meteor's identity an absolute secret from everyone else, under the threat that he would no longer be able to transform should his identity be exposed. This happened twice in fact; first when Cancer Zodiarts managed to catch him out of transformation and second when murdering Gentaro.

• After transforming into Kamen Rider Meteor, Ryusei says "Kamen Rider Meteor, I'll decide your fate!" (仮面ライダーメテオ、お前の運命は俺が決める!, Kamen Raidā Meteo, Omae no sadame wa ore ga kimeru!). Kamen Rider Meteor has two Limit Break finishers on his own. The first is the spinning attack called the Meteor Tornado (メテオトルネード, Meteo Torunēdo) and the second is a Rider Kick called the Meteor Strike (メテオストライク, Meteo Sutoraiku).[7][8][9] His weapon of choice is the Meteor Galaxy (メテオギャラクシー, Meteo Gyarakushī), a gauntlet on Kamen Rider Meteor's right arm. By pressing one of the three levers and then activating the Finger Mount Panel (フィンガーマウントパネル, Fingā Maunto Paneru), Kamen Rider Meteor can summon Cosmic Energy to harness the power of either Mars, Jupiter or Saturn. When the Meteor Switch is inserted into the Meteor Galaxy's Switch Socket, it initiates a Rider Punch Limit Break known as the Starlight Shower (スターライトシャワー, Sutāraito Shawā).
• Kamen Rider Meteor Storm (仮面ライダーメテオストーム, Kamen Raidā Meteo Sutōmu): Meteor's blue and yellow powered-up form accessed by the Meteor Storm Switch (メテオストームスイッチ, Meteo Sutōmu Suitchi). After changing into Kamen Rider Meteor Storm, Ryusei says "Kamen Rider Meteor Storm, my fate will deliver a storm!" (仮面ライダーメテオストーム、俺の運命は嵐を呼ぶぜ!, Kamen Raidā Meteo Sutōmu, ore no sadame wa arashi o yobuze!). His weapon is the Meteor Storm Shaft (メテオストームシャフト, Meteo Sutōmu Shafuto) gun staff. When the Meteor Storm Switch is inserted in the Meteor Storm Shaft, it initiates the Limit Break finisher called the Meteor Storm Punisher (メテオストームパニッシャー, Meteo Sutōmu Panisshā),[10] which launches the Storm Topper on the Meteor Storm Switch, absorbing some of a Zodiarts's Cosmic Energy with each strike and increasing its attack strength each time.

He originally attended transferring to AGHS and weaseling his way into the Kamen Rider Club in order to track down the yet to manifest Aries Zodiarts for his personal agenda. After the Aries Zodiarts makes his appearance and his identity as Kamen Rider Meteor is revealed to the members of the Kamen Rider Club, Ryusei properly joins the Kamen Rider Club as an official member and one of Gentaro's friends.

Ryusei Sakuta is portrayed by Ryo Yoshizawa (吉沢 亮, Yoshizawa Ryō).

Chuta Ohsugi (大杉 忠太, Ōsugi Chūta) is the second year geography teacher, and later third-year homeroom teacher, with a habit of punctuating his sentences with a snap of the suspenders he always wears. He is a middle-aged man who has bad looks and a bad personality who is disliked by many students, as it is part of his belief that teachers should not be friends with students, but he does take his role as a teacher very seriously. He is infatuated with Ms. Sonoda, even though she does not have any interest in him and would always walk away when he is about to confess his feelings. Mr. Ohsugi also gets into arguments with Gentaro over him not wearing the school uniform, among many other things, and has since listed him as the top problematic student in the school. Ryusei also gets on Mr. Ohsugi's bad side by pointing out that Gentaro is within his rights in terms of the dress code not being strictly mandatory. He also happens to be very superstitious, reading the weekly horoscope (he is a Scorpio) and believing in curses. He likes to put up a strong front, only to shirk and cower later when things go haywire. He is also shown to be jealous of Hayami, as he is almost a complete opposite of what he is and Hayami is very close to Ms. Sonoda. He is very obviously devastated in Ms. Sonoda's "absence due to illness" for extended periods, even more so when he heard that she quit her job altogether later, blaming Gentaro and the others for her health trouble to the point of arranging it that he would be their homeroom teacher in their third year, as well as putting those three he deems problematic in his class in the front seats so to keep an eye on them. His obsession with catching their misdeeds eventually leads him to discover the Rabbit Hatch and the existence of the Kamen Rider Club. He finds it absurd that not only are the three students he deems problematic are in the technically illegal club, second-year students and even star alumni are in too. Even after hearing their reasons to have the club as such, Mr. Ohsugi still intends to disband the club as it has failed in following the rules of being approved by a faculty member, eventually escaping the Rabbit Hatch with a confiscated Net Switch to hand over to Principal Hayami. However, upon learning from Ran that some of the faculty are playing a role in the monster attacks, and after seeing the Kamen Rider Club in action when they save him from the Musca Zodiarts, Mr. Ohsugi gives the club his approval to be a legitimate school club and becomes the group's academic adviser, stating that it his duty as a teacher to look out for his students and gaining the respect from the club members, and reconciling with the three he deems to be nothing but trouble. JK later tells Mr. Ohsugi everything about the identity of the Horoscopes and he is surprised to learn that Ms. Sonoda was the Scorpion Zodiarts. When the Leo Zodiarts tries to destroy the Rabbit Hatch, Mr. Ohsugi jumps into the fray and tries to stop the Zodiarts from harming his students, showing that he has become very close to the Kamen Rider Club.

Chuta Ohsugi is portrayed by Takushi Tanaka (田中 卓志, Tanaka Takushi) of the owarai duo Ungirls.

Miyoko Ohki (大木 美代子, Ōki Miyoko), nicknamed Miyoppe (ミヨッペ), is a student at Amanogawa High after 5 years after the end of the original series. She is the new (and only) member of the Space Kamen Rider Club at this time. She appears in Kamen Rider × Kamen Rider Wizard & Fourze: Movie War Ultimatum.

Miyoko is an homage to Satoko Ohki (大木 サトコ, Ōki Satoko), the heroine of the Inazuman manga.

Miyoko Ohki is portrayed by Rika Adachi (足立 梨花, Adachi Rika).

Toshiya Miura (三浦 俊也, Miura Toshiya) is a second-year student who is a member of the AGHS football team, but due to how Shun's father is forcing Shun to make unpopular decisions for the team, Toshiya is demoted to equipment manager. To enact his revenge, he acquires the means to become the Orion Zodiarts to attack Shun for ruining his football chances. Kamen Rider Fourze manages to defeat the Orion Zodiarts, and Toshiya is told that he need not have resorted to such means. Months later, Toshiya has not returned to school and the Kamen Rider Club goes to find him where he tells them that he will not be returning to AGHS, despite the requests of his girlfriend Mari. It is later revealed that the reason why he doesn't want to return to school is that he became addicted to Switches, and would start looking for one if he is around school. He became afraid of himself and thus decided to shut himself in. In this time when the Kamen Rider Club go look for him, he is also sought after by the Scorpion Zodiarts so he may become the Orion Zodiarts once again. When he is reminded of how he was before he was given the Zodiarts Switch and wanting to return to his old self, Toshiya manages to reject the Scorpion Zodiarts's temptation on his own without any external interference. He then befriends Gentaro and returns to AGHS, although rather than join the Kamen Rider Club, he joins the photography club to be with Mari.

Toshiya Miura is portrayed by Masanori Mizuno (水野 真典, Mizuno Masanori).

Tamae Sakuma (佐久間 珠恵, Sakuma Tamae) is a third-year student who is Miu's sidekick and fellow member in the cheerleading squad. She feigns her friendship with Miu, as she secretly resents losing to her every year in the Queen Festival, and uses the opportunity given to her by the Scorpion Zodiarts to enact her revenge as the Chameleon Zodiarts. When she is defeated by Kamen Rider Fourze, Miu encourages her to work harder the following year.

Tamae Sakuma is portrayed by Maria Yoshikawa (吉川 まりあ, Yoshikawa Maria).

Jun Shigeno (繁野 ジュン, Shigeno Jun) is a second-year student who is Miu's sidekick and fellow member in the cheerleading squad. She comes off as an airhead with a hearty appetite, but is left in charge of the cheerleaders by Miu since there was are no other substitutes for the moment, while Miu decides to spend more time in her role as the Kamen Rider Club President. As Miu's term is about to end, she comments on how much the squad improved on Jun's watch.

Jun Shigeno is portrayed by Arisa Fujisaki (藤嵜 亜莉沙, Fujisaki Arisa).

Reiko Hirota (広田 玲子, Hirota Reiko) is a first-year student that Gentaro tries to convince to enter the Queen Festival to unseat Miu from her yearly winning streak. However, an attack by the Chameleon Zodiarts scares her into backing out of the contest. Reiko later becomes Shun's girlfriend after Miu dumps him. Eventually, she dumps Shun after seeing him with Gentaro and the others working as groundskeepers during their detention. She later ends up indirectly involved in the incident with Hiroki Makise as one of the girls involuntarily dragged into a bus about to drive off a bridge by his Zodiarts form. She and the other girls would later be saved by Shun in the Powerdizer and dealt with Makise personally after he was defeated as the Pyxis Zodiarts.

Reiko Hirota is portrayed by Yurika Tachibana (橘 ゆりか, Tachibana Yurika).

Chosuke Ban (番 長介, Ban Chōsuke) is a third-year student who leads a group of other delinquent students who hang out behind the school. He and his gang pick fights with Gentaro whenever he is looking for information, and they are single-handedly beaten by Gentaro each time. He is seen in the seventh episode, having given JK a tip on a mysterious student with other delinquents in a new hang out. In the Net Movies, Chosuke is interviewed by Hayami as a potential final Horoscopes member. Though Chosuke would be an ideal candidate due to his history with Gentaro, his constellation is Pictor.

Chosuke Ban is portrayed by Takahiro Kuroishi (黒石 高大, Kuroishi Takahiro).

Mari Yamamoto (山本 麻里, Yamamoto Mari) is a student who is Toshiya Miura's girlfriend and a member of the AGHS photography club. She seeks out Shun's assistance into getting Toshiya into attending school again.

Mari Yamamoto is portrayed by Natsumi Ishibashi (石橋 菜津美, Ishibashi Natsumi).

Junta Abe (阿部 純太, Abe Junta) is a second-year student who is the president of the AGHS glee club.

Junta Abe is portrayed by Tokimasa Tanabe (田辺 季正, Tanabe Tokimasa).

Taira Katagiri (片桐 平, Katagiri Taira) is an overweight first-year student who is a member of the AGHS glee club. In the Net Movies, Taira is interviewed by Hayami as a potential final Horoscopes member. However, his constellation is Pisces Austrinus.

Taira Katagiri is portrayed by Yosuke Nishi (西 洋亮, Nishi Yōsuke).

Ibuki Watanabe (渡辺 伊吹, Watanabe Ibuki) is a student in Gentaro, Yuki, and Kengo's class who is a member of the AGHS glee club.

Ibuki Watanabe is portrayed by Ibuki Yoshida (吉田 伊吹, Yoshida Ibuki).

Rumi Egawa (江川 留美, Egawa Rumi) is a second-year student who is a member of the AGHS track and field club. She has inferiority complex regarding her above average height and size for girls, which resulted in her falling into a slump both in her enthusiasm as well as performance as a member of the team. Kengo attempts to help her out by giving her advise in improving her performance, but the club captain, Jin Nomoto berated both her, for taking advise from outsiders, and Kengo, for meddling in the club's affairs. She got Kengo joined the club to be her personal adviser for the coming competition to circumvent Nomoto's reasoning, but that only angers Nomoto further as he sees that as an insult to him. She eventually won the competition and gives her plaque to Kengo as a gift.

Rumi Egawa is portrayed by Youki Kato (加藤 侑紀, Katō Yūki).

Misa Toriizaki (鳥居崎 ミサ, Toriizaki Misa) is member of AGHS's ballet club who leads the Ugly Duckling Society (醜いアヒルの子の会, Minikui Ahiru-no-ko no Kai), a club whose members follow the Cygnus Zodiarts after being saved by him. As the head of the Society, she grades people in a way similar to how Cygnus believes people are worthy of his presence. The Kamen Rider Club initially believes that she is the Cygnus Zodiarts before learning that it was an alternate personality of Norio Eguchi. However, being faithful to Cygnus, Misa forces Eguchi to transform before seeing the Cygnus Zodiarts' true colors and disbanding the group soon after.

Misa Toriizaki is portrayed by Kaya Asano (浅野 かや, Asano Kaya).

Yukina Takamura (高村 優希奈, Takamura Yukina) is a third-year student who is in the same class as Gentaro, Yuki, Kengo, and Ryusei. Having watched Gentaro for a long time and learning he was Kamen Rider Fourze, she genuinely feels sorry for him, believing that all of the fighting he is doing is taking away from his chance to live a normal life as a teenager. Accompanying them on the class trip to Kyoto, Yukina zealously does everything she can to become Gentaro's girlfriend to ensure Gentaro is having a good time, while holding Yuki's Hayabusa plush doll hostage to force her to cooperate. After Gentaro reveals his identity as Kamen Rider Fourze to her, she reveals that she had known the fact that he is a Kamen Rider all along and attempts to convince him to quit by stealing the Fourze Driver, but she is persuaded afterwards by both Gentaro and Yuki to return the Driver, when the Libra Zodiarts attacks the last altar keeping The Hole above Kyoto from collapsing. She comes to understand that to Gentaro, going lengths to help any friend in trouble is completely normal, with or without Kamen Rider Fourze's powers. In exchange for returning the Fourze Driver, she asks that they take a picture with their most beautiful smiles together before they go back to school.

Yukina Takamura is portrayed by Mika Akizuki (秋月 三佳, Akizuki Mika).

Sayaka Mibu (壬生 彩加, Mibu Sayaka) is a third year student and AGHS's student council president. She and Sugiura never saw eye to eye and have always been butting heads over a variety of matters concerning the student body, chief among them a quartet of reckless students abusing the school's policies of allowing freedom. She insists on implementing measures to keep students in check while Sugiura insists on allowing students maximum freedom. Confronting Kamou, Kiyama, Kito, and Umezawa about it when they went too far, Sayaka fell down the stairs and is hospitalized as Sugiura assumes her duties. Though she thinks Sugiura has finally come to his senses and accepts her views, Sayaka learns that Sugiura actually has feelings for her and instead of adopting her views, Sugiura is only doing it for her sake. She agrees to help Gentaro reach Sugiura to stop the madness in school. Though she assures him that she will resume her duties in a matter of weeks, Sayaka is horrified to find Sugiura sucked into the Dark Nebula.

Sayaka Mibu is portrayed by Yuka Eda (江田 結香, Eda Yuka).

Shoko Oki (沖 荘子, Oki Shōko) is the head of the student council's decency committee. She has feelings for Sugiura and though knowing that Sugiura has feelings for Sayaka, she follows his lead faithfully and dutifully carries out Sugiura's orders despite the bizarreness, thinking that Sugiura will notice her feelings for him if she keeps doing what he tells her to. She eventually breaks down when Sugiura disregards her loyalty all these while altogether and chooses to punish her for her inability to capture Tomoko instead. She indirectly help to bring an end to all the madness happening in the school by telling Gentaro all she knows about Sugiura and Sayaka.

Shoko Oki is portrayed by Seira Maeda (前田 聖来, Maeda Seira).

Keisuke Yanami (矢波 敬介, Yanami Keisuke) is a member of the student council.

Keisuke Yanami is portrayed by Ryotaro Sakaguchi (坂口 涼太郎, Sakaguchi Ryōtaro).

Takato Daimonji (大文字 高人, Daimonji Takato) is Shun's father who made his son's decisions so Shun could meet his father's expectations. He presents a statue in honor of the AGHS football team's win at the regional tournament.

Takato Daimonji is portrayed by Ryo Kamon (加門 良, Kamon Ryō).

Nadeshiko Misaki (美咲 撫子, Misaki Nadeshiko) is a transfer student at AGHS whom Gentaro falls in love with. However Nadeshiko was actually the SOLU, short for "Seeds Of Life from the Universe", from the meteorites which copied a human form. By seeing Gentaro transform into Kamen Rider Fourze, she copies it to make a Nadeshiko Driver (なでしこドライバー, Nadeshiko Doraibā) which enables her to transform into Kamen Rider Nadeshiko (仮面ライダーなでしこ, Kamen Raidā Nadeshiko). Her belt is also compatible with the Astroswitches, but can only use Astroswitches for the arms and lacks the use of Limit Break. It contains copies of the Rocket Switch and Radar Switch. She also creates the Mega Burgermeal Foodroid and a copy of the Camera Switch. She is later taken by Suddendath and turned into the SOLU Switch for Kannagi to transform into the Super Gingaoh. She creates the S-Rocket Switch for Kamen Rider Fourze to use, which she leaves Gentaro before being captured. Kamen Rider Nadeshiko's Rider Kick is the Nadeshiko Rocket Kick (なでしこロケットキック, Nadeshiko Roketto Kikku), which is based on the heel kick performed by Homare Sawa during the 2011 FIFA Women's World Cup. She can also perform the Double Rider Rocket Punch (ダブルライダーロケットパンチ, Daburu Raidā Roketto Panchi) with Kamen Rider Fourze.

During the events of Kamen Rider × Kamen Rider Wizard & Fourze: Movie War Ultimatum, Nadeshiko was reunited with Gentaro through the help of XVⅡ as she participate, along with other Kamen Riders, in the final battle against the Akumaizer before she gave the Nadeshiko Switch to Gentaro in order to become Fourze Meteor Nadeshiko Fusion States.

Nadeshiko was originally meant to be named after Electro-Wave Human Tackle, also known as Yuriko Misaki (岬 ユリコ, Misaki Yuriko), Kamen Rider Stronger's partner, with Nadeshiko's surname written in different kanji.

Nadeshiko Misaki is portrayed by Erina Mano (真野 恵里菜, Mano Erina) of Hello! Project.[11]

Jiro Iseki (井石 二郎, Iseki Jirō) is one of Ryusei's friends from Subaruboshi High School who somehow acquired a Zodiarts Switch because he wanted to be stronger than Ryusei. However, the Switch is incompatible with him and thus backfired, which caused a massive explosion that severely injured Jiro, rendering him in a coma ever since. The Zodiarts Switch stayed in a turned-on state since then and as only he himself can turn the switch off, the lingering effects in him rendering him unable to helped by modern medicine. This event would lead to Ryusei becoming Kamen Rider Meteor to find Aries Zodiarts under Tachibana's orders. Though he is not sure what the Horoscopes can do, but he knows that the said Zodiarts can save Jiro. When the Aries Zodiarts finally makes its appearance, Ryusei betrays both Tachibana and the Kamen Rider Club in order to fulfill his wish to save Jiro. The Aries Zodiarts honors his deal with Ryusei and awakens Jiro, with Ryusei finally being able to get him to turn the Zodiarts Switch off. The joy is short-lived however, as Jiro is still critically injured despite being awakened and relapses, due to losing the will to live after Ryusei tells him the lengths he went to save him. After being inspired by Kengo's method in reviving Gentaro, Ryusei visits and talks to Jiro to helps him out of his physical coma, and Ryusei is finally able to help into a speedy recovery.

Jiro Iseki is portrayed by Ryusei Yokohama (横浜 流星, Yokohama Ryūsei).

Goro Kisaragi (如月 吾郎, Kisaragi Gorō) is Gentaro's grandfather who looks after Gentaro since his parents died in an accident several years ago. He owns a local motorcycle shop called Kisaragi Motorcycle Engineering (如月モータース, Kisaragi Mōtāsu).

Goro Kisaragi is portrayed by Nobuo Yana (八名 信夫, Yana Nobuo).

Mei Shirakawa (白川 芽以, Shirakawa Mei) is a student at Subaruboshi High School who is friends with Ryusei before he transfers to Amanogawa High School, though she wants to be his girlfriend.

Mei Shirakawa is portrayed by Runa Natsui (夏居 瑠奈, Natsui Runa).

Azusa Seta (瀬田 あずさ, Seta Azusa) is the physical education teacher at Subaruboshi High, forced into Yamada's play by becoming the English teacher. However, her inability to speak the English language fairly well has her be constantly threatened by Yamada for failing his expectations.

Azusa Seta is portrayed by Mitsumi Hiromura (広村 美つ美, Hiromura Mitsumi).

Rokuro Utahoshi (歌星 緑郎, Utahoshi Rokurō) is Kengo's father who worked for the OSTO on the lunar base that would later become the Rabbit Hatch. Studying Cosmic Energy together with Gamou and Emoto, he managed to develop both the Fourze Driver and the Astroswitches from the Core Switch yet expected the finalized versions would be made by future generations after his death. Seventeen years prior to the beginning of the series, Emoto's actions in taking the Zodiarts Switches to Earth for Gamou led to the destruction of most of the base with Rokuro stranded on the moon to die. However, he left an inscription on the outer wall of the Rabbit Hatch, explaining the legacy he meant to leave behind with the Astroswitches and Fourze Driver, which is also the belief that he upholds steadfastly.

Rokuro Utahoshi is portrayed by Toru Kazama (風間 トオル, Kazama Tōru).

Keizo Jingu (神宮 敬蔵, Jingū Keizō) is JK's father who currently works as a fisherman, but he was once a popular musician and inspired JK to want to be a rock singer despite his own lack of talent. His leaving of this life behind prompted JK and Goto to follow their dreams of forming a rock band together, referring to him as a loser who gave up on his dreams (夢をあきらめた負け犬, yume o akirameta makeinu). He teaches Gentaro how to play the song he used to play to his son, which enables Gentaro to not only regain JK's friendship and snap him out of his delusions, but also indirectly leading Gentaro to beat the Capricorn Zodiarts. At the end of the episode, he and JK talk to each other through their cellphones, having a heart to heart chat.

Keizo Jingu is portrayed by Seigi Shimizu (志水 正義, Shimizu Seigi). As a young musician, Keizo is portrayed by Ryo of defspiral.

Yuki's father and mother are two eccentric people. As much as Yuki is in love with space travel, they are in love with different cultures as they like to dress up in the fashion matching the meals they make. For example, if they prepare French food, they dress up in French-style clothing.

Yuki's father is portrayed by Yuu Kamio (神尾 佑, Kamio Yū) and her mother by Mari Takahashi (高橋 麻理, Takahashi Mari).

Tsuyoshi Satake (佐竹 剛, Satake Tsuyoshi) is the teacher in charge of the Sunday remedial class/detention session, where allegedly only the most troublesome students in the school get forced into, and labeled by many students as "Study Hell" (地獄補習, Jigoku Hoshū) as he is a cruel and unforgiving man who makes his purpose to teach those in his class to become productive members of society. Mr. Satake also has an extreme intolerance towards delinquents, likening them to spots of dirt in a clean campus. He went so far to even call Gentaro a "bad boy" (バッドボーイ, baddo bōi), as well as giving him more severe punishments than all others in his class. However, after Gentaro saves his son from himself, Mr. Satake has a change of heart and gives Gentaro a passing grade in the test suggested by Shun just to give Gentaro a hard time. In the series epilogue, with Hayami gone, Mr. Satake takes over the role of principal.

Tsuyoshi Satake is portrayed by Satoshi Jinbo (神保 悟志, Jinbo Satoshi).

Haruka Utsugi (宇津木 遥, Utsugi Haruka) replaces Sarina Sonoda as the homeroom teacher for class 2-B, though she is rather uninterested with the job and always muses about quitting her job as a teacher, even in front of the students. She is a well-trained kickboxer and quite wary of her surroundings. Unlike the sour face she puts on at school, she is shown to be truly happy when she is training. She takes up a teaching job only because she is unsure if she can make a living out of kickboxing. Due to her fighting style, she is set up to look like as if she is the Switcher of the Pegasus Zodiarts. Gentaro eventually learns the truth while counseling Ms. Haruka, revealing his identity as Kamen Rider Fourze to her. He tells her that she has to stay true to her path in life, suggesting that she should try to balance her life both as a kickboxer and a teacher instead, just like how he is balancing his life both as a student and a Kamen Rider. Eventually she opts to stay at AGHS, forming a kickboxing club and, to Gentaro's chagrin, insists that he take some lessons from her, as his form is rather sloppy and inefficient.

Haruka makes a brief appearance in Kamen Rider × Kamen Rider Wizard & Fourze: Movie War Ultimatum, where it is stated that in addition to teaching, she has now become a champion kick boxer.

Haruka Utsugi is portrayed by Nao Nagasawa (長澤 奈央, Nagasawa Nao).[12]

Mr. Morota (諸田先生, Morota-sensei) is an effeminate math teacher at AGHS who has romantic feelings for Hayami. In the Net Movies, during his search for the final Horoscopes member, Hayami has a horrible nightmare where Morota is the Pisces Zodiarts.

Mr. Morota is portrayed by Satoshi Morota (諸田 敏, Morota Satoshi), who is also the show's director.

Mitsuaki Gamou (我望 光明, Gamō Mitsuaki), previously referred to as the red-eyed man (赤い目の男, akai me no otoko), is Amanogawa High School's school board chairman who often uses space metaphors in his speech. As a child, Gamou heard the call of the Presenters at the time of the Apollo 11 exploration, motivating him to join NASA and the Russian Federal Space Agency in attempts to fulfill his promise to meet them. While able to encourage others, believing the Presenters' call and promise to be destiny, Gamou has ultimately always been friendless and considered the concept beneath him. Twenty years prior to the beginning of the series, while a member of OSTO, Gamou and Utahoshi found the Core Switch that the Presenters sent to the moon as a test for sentient life in the solar system. The two cracked the majority of the puzzle of the Core Switch, but clashed over the method by which the Presenters should be contacted. Seeing Utahoshi's Fourze System a dead end as it would be generations before it was completed, Gamou's egocentric nature leads him to create the Zodiarts Switches as a means to forced evolve humans into beings able to withstand the rigors of transwarp travel. Three years after the finding, Gamou had Emoto steal the completed Zodiarts Switches from the OSTO lunar station and murder Utahoshi, though Emoto instead left him stranded on the moon.

A decade before the events of the series, Gamou built Amanogawa High directly under The Hole, ostensibly in order to foster a love of space exploration in future generations. But in reality, with a funding arrangement set up with Foundation X, Gamou utilized the school to create and raise Zodiarts in order to find and gather all twelve members of the Horoscopes for the Day of Awakening. To that end, Gamou became one of the first Horoscopes, the powerful Sagittarius Zodiarts (サジタリウス・ゾディアーツ, Sajitariusu Zodiātsu) who can generate a bow on his left forearm called Gilgamesh (ギルガメッシュ, Girugamesshu) to unleash a barrage of Cosmic Energy arrows known as the Apostolos (アポストロス, Aposutorosu). Like Tatsugami, it is seen that Gamou can utilize other Horoscopes Switches, but rarely does so as he prefers the overwhelming power of his own Switch. Because of his saturation with massive levels of negative cosmic energy, even in his human form Gamou is shown to possesses supernatural abilities such as giving other members of the Horoscopes the ability to acquire Supernova powers and the ability to conduct hypnotic suggestion that he uses on outsiders to drive them away, thus keeping his true agenda a secret from prying eyes.

During the first half of the series, Gamou uses the principle he set up in his school to encourage the manifestation of individuality in students so that Zodiarts selected from among them can do whatever pleases them in hope they can become Horoscopes, even if it means doing extensive damage to the school. Only the Horoscopes members are accounted for if they are defeated by a Kamen Rider too many times. Gamou almost sends Principal Hayami to the Dark Nebula for his repeated failures but kept him as his awaken Supernova power would quicken the search for their remaining members while learning from Tatsugami, through Goto's powers, that the Core Switch still exists. With only two Horoscopes left, after Emoto reveals his true colors in aiding Fourze and Meteor, Gamou makes himself known in his Zodiarts form as he easily defeats the two Kamen Riders. During the incident with the Gemini Zodiarts, whom he had a personal interest in due to Yuki having heard the Presenter like he had, Gamou begins to suspect Kengo to possess the Core Switch. Although he does not initially see the boy to be a threat, his identity being revealed in the process, Gamou's Day of Awakening is thwarted by Kengo using his Core Child powers to negate the Horoscopes Switches. Knowing that Kengo would need to die to achieve his goals and not be beaten to the Presents, Gamou assumes his Sagittarius Nova (サジタリウス・ノヴァ, Sajitariusu Nova) form, trading his bow and armor for a much lighter body. In this state, Gamou can launch arrows from his left hand and perform a flying kick attack similar to a Rider Kick, with his leg surrounded by an aura of negative Cosmic Energy resembling an arrow. After sending the Leo Zodiarts to attack the Rabbit Hatch and lure out Kengo as he was about to leave Earth, Gamou crushes the Core Switch that maintains Kengo's life. Though he believes he will succeed this time, Sagittarius Nova finds himself facing Fourze before being defeated by the Kamen Rider's Rider Rocket Drill Kick attack. Defeated and finally accepting Gentaro's ideals, he accepts Gentaro's friendship, but his body begins to evaporate into stardust due to side-effect of his forced evolution. After asking the Kamen Rider Club to meet the Presenters in his stead, Gamou leaves to spend his final moments alone and use what little time he has left in mending the broken Core Switch with the Aquarius Zodiarts' healing powers to resurrect Kengo.

The kanji that comprise Gamou's given name can be translated as "bright light" (光明, kōmei), which is one of the epithets of the Greek sun god Apollo which befits Gamou's connection to the Sagittarius constellation and Emoto's comparison of the man to the sun in terms of his genius intellect.

Mitsuaki Gamou is portrayed by Shingo Tsurumi (鶴見 辰吾, Tsurumi Shingo). As a child, Gamou is portrayed by Musashi Takahata (高旗 武蔵, Takahata Musashi).[13]

Sarina Sonoda (園田 紗里奈, Sonoda Sarina) is the youthful and beautiful homeroom teacher of class 2-B who teaches classical literature. Though she appears to be a well-loved teacher, Sonoda is actually a Horoscopes member who uses her pleasant facade to know students better to find ideal Horoscope candidates. She herself was originally an AGHS student until she met Hayami, who gave her a Zodiarts Switch that enabled her to become the Canis Minor Zodiarts (カニスミノル・ゾディアーツ, Kanisu Minoru Zodiātsu).[14] Eventually, after her Zodiarts Switch assumed its Last One state and her Resurrection Star glowed, Sonoda discarded her humanity and evolved into the Scorpion Zodiarts (スコーピオン・ゾディアーツ, Sukōpion Zodiātsu). While in her Scorpion Zodiarts state, likely to conceal her identity, Sonoda's voice deepens to sound masculine. Out of Gamou's inner circle, Ms. Sonoda is among the most loyal to his cause and serves as his right hand.

Using the special Scorpion Switch to assume her Zodiarts form, the Scorpion Zodiarts uses a kick-based fighting style. She is also armed with powerful claw gauntlets and a scorpion's tail-like ponytail that doubles as a whip and can inject an agonizing venom into her victims. The Scorpion Zodiarts initially works behind the scenes, distributing Zodiarts Switches to students motivated by revenge on those who wronged them. The Scorpion Zodiarts later fights Fourze during the events of the Chameleon Zodiarts's vendetta against Miu, mainly to keep the Kamen Rider from interfering as Gamou gave his subordinates orders to not eliminate the Kamen Rider. But Gamou retracts his order when Sonoda begins to give Miura a new Zodiarts Switch, unlocking her Supernova power to assume the scorpion man-like Scorpion Nova (スコーピオン・ノヴァ, Sukōpion Nova). This enables her to battle the now visibly stronger Fourze while holding enough energy mass to destroy a city, only for Fourze to defeat her after getting her into space with a Big Space Rider Rocket Drill Kick. Spirited away by Hayami with her identity protected, Sonoda is relieved of her Zodiarts Switch until she pleads Gamou into giving it back to her in response to the appearance of Kamen Rider Meteor. But her loss against Meteor results with her being seemingly banished into the Dark Nebula by the Virgo Zodiarts as punishment for her repeated failures. Though later revealed to be alive and in suspended animation within the M-BUS, Sonoda's Scorpion Switch is given to Gamou before he entrusts its use to Tatsugami. Sonoda's disappearance is covered up soon after to make it seem that she is on a sabbatical and then a resignation due to health reasons.

An anagram of her name Sonoda Sarina (そのださりな) is the phrase Sasori na no da (さそりなのだ), which means "I am the scorpion".[15]

Sarina Sonoda is portrayed by Yuka Konan (虎南 有香, Konan Yuka). The masculine voice of the Scorpion Zodiarts is provided by Eiji Takemoto (竹本 英史, Takemoto Eiji).[16][17]

Kouhei Hayami (速水 公平, Hayami Kōhei) is the principal of Amanogawa High School. He is an attractive and charming young man who has a Ph.D in Physics, that most of the student body and faculty, even the mothers of the students, save for Mr. Ohsugi, fall for. In actuality, he is a loyal member of the Horoscopes who uses the Libra Switch to transform into the Libra Zodiarts (リブラ・ゾディアーツ, Ribura Zodiātsu) who uses his khakkhara called Dikē (ディケ, Dike) to create illusions to fool his targets. Though capable of holding his own in a fight, the Libra Zodiarts is one of the weaker members within the Horoscopes in terms of combat capabilities as he overwhelmed when the Kamen Riders have access to their upgrade forms. He is a shrewd character with an inquisitive nature and has managed to prevail thus far, due to him actively avoid direct confrontation with the Kamen Riders and undying loyalty to Gamou. True to the nature of his Zodiarts form, which is based on a star sign that takes the form of a scale, Hayami has a habit of using terms related to weight like "light" and "heavy" when talking to others.

In his first appearance before the Kamen Rider Club, he saves the unconscious Ms. Sonoda while casting an illusion over her to protect her identity from Kamen Rider Fourze. Hayami then reluctantly takes over her duties in the distribution of Zodiarts Switches, targeting those among his prized pupils who have the potential to become Horoscopes. He also rarely intervenes with the businesses of his Zodiarts recruits by fighting Kamen Rider Fourze. After Ms. Sonoda is sent to the Dark Nebula, Hayami is ordered by a worrisome Gamou to speed up his recruitment strategy. Playing an indirect role in bringing Natsuji Kijima into the Horoscopes' ranks, not tolerating the newcomer's blatant disrespect towards him on many levels, Hayami takes advantage of Kijima's defeat by Kamen Rider Meteor Storm to get him sent into Kijima into the Dark Nebula while he gives Gamou the Cancer Switch. Using a field trip to Kyoto have Kamen Rider Fourze's presence reveal four altars gathering Cosmic Energy to The Hole above the city, with Tatsugami assigned to oversee his progress, Hayami destroys the four altars so only The Hole above AGHS can amass Cosmic Energy. Though he succeeds, his defeat by Kamen Rider Fourze deems him as of no further use to Gamou.

However, Hayami's desperation of being exiled causes him to manifest his Supernova state in the form of the Eye of Laplace (ラプラスの瞳, Rapurasu no Hitomi), a power that enables him to see a person's "Fate of the Stars" (星の運命, Hoshi no Sadame) to see not only one's potential to become a Horoscopes member but eventually locate other Horoscopes Switches. With this newfound power, Gamou allows Hayami to stay so they can put his new power in recruiting the Capricorn, Aquarius, and Taurus Zodiarts. But as the final phase of Gamou's plan begins, playing a role in Emoto's death and in Dark Yuki's creation, Hayami begins to question the Horoscopes' goal and where he fits in it once his usefulness comes to an end before being welcomed into Gamou's inner circle as he learns the nature of the Day of Awakening. As revealed in the Net Movies, with Tatsugami harassing him to no end, Hayami spends his time searching for the final Horoscopes member by interviewing students before finally finding Ran. From there, Hayami formulates a scheme where he appears to betray Gamou to ensure that Ran becomes the Pisces Zodiarts, giving his Libra Switch to the Kamen Rider Club as a proof of his conviction before it ends up being Tatsugami who secretly gives it back to him. But once everything goes to plan, Hayami reveals his true colors before taking a Rider Super Galaxy Finish meant for the Sagittarius Zodiarts. Drifting into the Dark Nebula, satisfied with his self-sacrifice, the Libra Zodiarts is vaporized by the vortex's lightning.

His given name Kōhei (公平) is also the Japanese word for "fairness", "impartial", and "justice", referencing that the constellation of Libra represents the scales of Astraea, the Greek goddess of justice.

Kouhei Hayami is portrayed by Kousei Amano (天野 浩成, Amano Kōsei).[18]

The Virgo Zodiarts (ヴァルゴ・ゾディアーツ, Varugo Zodiātsu) is a feminine-appearing Zodiarts who serves as the judge and executioner amongst the Horoscopes. Armed with the Rhodia (ロディア, Rodia) halberd, the Virgo Zodiarts can produce barriers strong enough to deflect even the Limit Breaks of Fourze Cosmic States, fire black hole-like orbs that consume anything they touch, and conjure a portal to send victims to what is claimed to be the Dark Nebula. It is ultimately revealed that the Virgo Zodiarts is actually a man named Kuniteru Emoto (江本 州輝, Emoto Kuniteru), a research associate in OSTO with Rokuro Utahoshi and Mituaki Gamou studying Cosmic Energy. But Emoto was jealous of Utahoshi, comparing him and Gamou to the Earth and Sun while seeing himself as the moon, paling in comparison to either but reflecting the sun's light. Forming a partnership with Gamou, Emoto played a role in stealing the Zodiarts Switches from the OSTO space station, leaving Utahoshi stranded on the moon. But coming to regret his actions, vowing to take Utahoshi's place as the Earth in their relationship to Gamou, Emoto became one of the first members of the Horoscopes while using his space-time warping to travel from Amanogawa High to the Kyoto Space University (宇宙京都大学, Uchū Kyōto Daigaku) where he works as a professor studying The Hole above Kyoto.

Emoto also uses his teleportation powers to travel to the M-BUS satellite where he dons a mask and adopts the alias of "Tachibana" (タチバナ), using voice-altering software and claiming to be from the Anti-Zodiarts Union to use Ryusei as Kamen Rider Meteor while giving Kengo the Gate Switch which eventually lands him on the Rabbit Hatch. These actions are part of his ultimate motive to actually subvert Gamou's agenda. Furthermore, lying that he sent former members to die in the Dark Nebula, Emoto actually sends the former Horoscopes members to the M-BUS where they enter suspended animation for their own protection.

First appearing in his Zodiarts form during the events of Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max, Emoto attempts to capture Nadeshiko for Gamou before being forced to fall back after being hit with the Double Rider Rocket Punch.[19][20] Soon after sending Ryusei to Amanogawa High with instructions to conceal his identity, allowing him to continue being a Kamen Rider after the Kamen Rider Club learned his identity, Emoto proceeds to watch over the events to follow as Tachibana and the Virgo Zodiarts. After The Hole in Kyoto is negated, Emoto transfers to Miraikan where he becomes an instructor to Kengo, Yuki, and Tomoko. When Tomoko learned of his identity as the Virgo Zodarts while inspecting the Dark Nebula, Emoto sends her to the M-BUS to conceal his secret before using scare tactics to intimidate Yuki, Miu, Shun, and JK into leaving the Kamen Rider Club. This act was so Emoto, as Tachibana guise, can train Gentaro into using the Cosmic Switch through ruthlessness rather than friendship. But Emoto failed to take account for Kengo's ingenuity and the Libra Zodiarts' evolving Supernova powers, with his identities as both Tachibana and the Virgo Zodiarts are accidentally revealed to both sides along with his agenda. Once doubting the power of friendship as he had experienced its frailty first hand, Emoto regains faith in the sentiment after seeing Gentaro's reinforced faith in the friendship along with the Kamen Rider Club members staying by his size regardless of whatever danger looms ahead. But as Emoto becomes Gentaro's friend, he is mortally wounded by the Sagittarius Zodiarts prior to spiriting Kengo away to reveal the truth of his father's death. After pleaing Kengo to stop the Horoscopes, the greatly weakened Emoto is landed the final blow by the Leo Zodiarts after teleporting them and the Libra Zodiarts away from Kengo. Losing the Virgo Zodiarts Switch to Gamou as he is left to die, Emoto's final thoughts are the knowledge that he has gained new true friends and has done something worthwhile. Emoto also left behind a flash drive that Kengo finds, the contents of which detail his origins and the window of opportunity should the Day of Awakening start.

His surname Emoto (江本) when romanized is the Japanese word Otome (乙女), translated as "Virgin", read backwards.[21] The kanji that make up his given name Kuniteru (州輝) can be read as Supika (スピカ, "Spica"), which is a combination of su, an alternate reading of kuni (州), and pika, a Japanese onomatopoeia for the word kagayaku (輝く, "to shine"). As "Tachibana", Emoto took his name from the legendary man who aided the first seven Kamen Riders: Tōbei Tachibana (立花 藤兵衛, Tachibana Tōbee).

Kuniteru Emoto is portrayed by Hajime Yamazaki (山崎 一, Yamazaki Hajime). The female voice of the Virgo Zodiarts is provided by Rie Tanaka (田中 理恵, Tanaka Rie), who also voices Shun's mother.[22] The voice of Tachibana is performed by Nobuyuki Hiyama (檜山 修之, Hiyama Nobuyuki), who is also the series' narrator.

Kou Tatsugami (立神 吼, Tatsugami Kō) is a skilled martial artist who originally fought in street fights with little to live for. But it was after meeting and being bested by Gamou that Tatsugami found purpose in his life in the Horoscopes, becoming fanatically loyal to Gamou and serving as both his personal aide and bodyguard. He usually is seen crushing two walnuts with his bare hand as a display of his strength and drinks liquor alone in a quiet environment, taking offense to anyone who disrupts him at the time and attacking them regardless if they are allies. Though he knows Gamou's plan would destroy everything, Tatsugami is willing to die if helps his master. As the member of the Horoscopes as the Leo Zodiarts (レオ・ゾディアーツ, Reo Zodiātsu), one of the strongest fighters of the group with his massive clawed gauntlets and powerful lion's roar shock-wave attack, super speed, and toughness capable of shaking off Limit Breaks effortlessly. The Leo Zodiarts, compared to other Horoscopes, can also produce his own personal kabuki-themed retainers known as the Leo Dustards (レオ・ダスタード, Reo Dasutādo) that use twin Duswords. Prior to his formal meeting with the Kamen Rider Club, Tatsugami assumed his Zodiarts form to oversee the transaction of Gamou giving a set of Zodarts Switches to Lem Kannagi.[19][20] Tatsugami is sent by Gamou to oversee Hayami's progress in Kyoto, assuming his Zodiarts form to over power both Kamen Riders at once without any help. Meeting Tojiro Goto, Tatsugami cryptically revealed the new member's ability might be useful in locating the Core Switch, proven later by Gamou himself that he is now able to sense faint traces of the mysterious Switch. Like Gamou, Tatsugami has a unique physique where he can use the Zodiarts Switches of other Horoscopes members, his natural fighting abilities allowing him to effectively fight better than their original Switchers. After executing Emoto for his betrayal, Tatsugami takes over the role of obtaining the final two Horoscopes Switches. In the end, having had constant battles with Ryusei since their first meeting, Tatsugami is defeated by Kamen Rider Meteor Storm and his body dissolves away into stardust.

An alternate reading of his surname Tatsugami (立神) is Tategami, which is also the Japanese word for "mane" (鬣, tategami). The kanji used in his given name Kō (吼) is one of the kanji used for the word hoeru (吼える, "to roar").

Kou Tatsugami is portrayed by Kazutoshi Yokoyama (横山 一敏, Yokoyama Kazutoshi).[23]

Natsuji Kijima (鬼島 夏児, Kijima Natsuji) is an arrogant second-year student with a sharp tongue and who displays hostility toward anyone who irritates him. Originally president of the AGHS rakugo club, Kijima found a Zodiarts Switch by chance that the Libra Zodiarts dropped during a fight with Kamen Rider Fourze and becomes the Pegasus Zodiarts (ペガサス・ゾディアーツ, Pegasasu Zodiātsu), acquiring a new-found taste for power.[24] Using his newfound power, Kijima seeks revenge, while also for fun, on the new 2-B homeroom teacher Ms. Haruka Utsugi for taking his rakugo fan by attacking any martial artists he finds, mimicking her fighting style so the Kamen Rider Club would believe she is the Switcher. However, the club learns the truth before Kamen Rider Fourze Elek States destroys the Pegasus Zodiarts. Unfortunately, with the Virgo Zodiarts's help when his Zodiarts form resurrects, Kijima is able to evolve into the Cancer Zodiarts (キャンサー・ゾディアーツ, Kyansā Zodiātsu), who is armed with sharp and heavy pincers on his left forearm, capable of cutting just about anything, liquify himself to retreat or disappear, and his body is protected by a hard-spiky carapace strong enough to withstand even the Rider Super Electromagnetic Bomber Limit Break unscathed. All of the above combat-specific features, along with the ability to remove the life force of people and place them in comas, enable him to become the most powerful Hororscopes warrior so far. Although being the fifth Horoscopes and winning Gamou's favor, Kijima flaunts his strength around without discretion unlike his other Horoscopes comrades, and constantly picks fights with the Kamen Riders. He has also made an enemy out of Hayami by not only insisting on being treated as an equal, but also belittling the principal at every turn.

While learning Kamen Rider Meteor's identity, proceeding to mess with him for his amusement, Kijima somehow manages to evoke his latent Supernova powers on his own, enabling him to transform into the more crab-like Cancer Nova (キャンサー・ノヴァ, Kyansā Nova), with even more impregnable armor than his regular Cancer Zodiarts form. This amuses Gamou even more, although the chairman does muse behind Kijima's back that the Cancer Zodiarts's evolution is going too fast. After being defeated in his Supernova form by Kamen Rider Meteor's newly obtained Meteor Storm form, Kijima limps onto the AGHS campus and drops his Zodiarts Switch, which Principal Hayami takes. Though Kijima pleads with the principal, saying that he knows the true identity of Kamen Rider Meteor and the information would prove useful enough to win back Gamou's favor, Hayami states his intent to do away with him regardless. Finding himself in the form of a meddling detective by Hayami's illusion, Kijima is sent to the Dark Nebula by an unsuspecting Virgo Zodiarts after Hayami talks her into it. Hayami later conceals his actions by claiming that Kijima had died in battle, unaware that Kijima is actually in suspended animation within the M-BUS, as he gives Gamou the Cancer Switch before it is entrusted to Tatsugami.

The kanji that make up his given name Natsuji (夏児) are read in the on'yomi method as kani (かに), the Japanese word for "crab."

Natsuji Kijima is portrayed by Soran Tamoto (タモト 清嵐, Tamoto Soran).[25][26]

Tatsumori Yamada (山田 竜守, Yamada Tatsumori) is a transfer student at SBHS who is originally a quiet member of AGHS's drama club. However, upon arriving to Subaruboshi High, Yamada used the Zodiarts Switch he obtained to become the Lepus Zodiarts before evolving into the sixth member of the Horoscopes known as the Aries Zodiarts (アリエス・ゾディアーツ, Ariesu Zodiātsu). Armed with a scepter called Coppelius (コッペリウス, Kopperiusu), the Aries Zodiarts emits an aura that can slow down or speed up a person's bodily functions, allowing him to easily tire people out as well as rendering people unconscious. While not shown to be powerful in direct combat, the Aries Zodiarts's ability to put his opponent to sleep makes him extremely dangerous regardless, even to fellow Horoscopes if he wants to. He abuses this ability and developed a god complex to the point of totally disregarding the Horoscopes' interest in general and not meeting with Gamou. Yamada transfers to Subaruboshi High to break away from the chairman's scrutiny, and takes on the title of "The Apostle of Sleep (眠りの使徒, Nemuri no Shito) as he gets the entire school under his control and has everyone act in the roles he assigns them. However, being able to speed up bodily functions of a person means that he can easily revive someone as well. He is eventually brought before the chairman by the Virgo Zodiarts and Hayami advises to him to brace himself for a scolding. To the principal's surprise however, Gamou is rather delighted with Yamada's performance in SBHS, praising Yamada's work so far to be very individualistic and gives him full permission to do as he pleases.

Though Ryusei is only looking for the Aries Zodiarts under Tachibana's orders initially, he sees a way to save Jiro in the said Zodiarts. As a result, against Tachibana's orders, Ryusei decides to make a deal with Yamada, by killing Kamen Rider Fourze, to save Jiro. Honoring his end of the bargain, Yamada proceeds to orchestrate the Kamen Rider Club's deaths when Ryusei arrives to save them before Gentaro overpowers the Aries Zodiarts as Kamen Rider Fourze Cosmic States. Enraged, the Aries Zodiarts briefly transforms into Aries Nova (アリエス・ノヴァ, Ariesu Nova), with his horns changing shape while his eyes turn blue and his cape retracting. Though his full abilities in Supernova form are not seen, firing spheres of yellow energy at his opponent, the Aries Zodiarts is defeated by Kamen Rider Fourze's Rider Super Galaxy Finish. As the resulting attack places him in a coma, Yamada's Aries Switch is retrieved by the Virgo Zodiarts and given to Gamou, who then gives it to Tatsugami for safekeeping.

The kanji that make up his given name Tatsumori (竜守) translate into "dragon guard", referencing the dragon in the legend of the Golden Fleece of the ram Aries.

Tatsumori Yamada is portrayed by Kazuma Kawahara (川原 一馬, Kawahara Kazuma).[27]

Tojiro Goto (五藤 東次郎, Gotō Tōjirō) is a recent transfer student to AGHS who happens to be an old friend of JK's from junior high school. He is a rocker with a hearty appetite, though his guitar playing is terrible. Goto is found by Hayami, using his Eye of Laplace, to possess the potential to evolve from the Lyra Zodiarts (unnamed) into the Capricorn Zodiarts (カプリコーン・ゾディアーツ, Kapurikōn Zodiātsu), and is given a Zodiarts Switch prior to evolving into the said Horoscopes member. Unlike other Horoscopes members, he bears no ill will to anyone and just wants to be big as a rocker. As the Capricorn Zodiarts, he is armed with an electric guitar like weapon called Multi-stringed Koto Uruk (多弦琴 ウルク, Tagenkin Uruku) that is able to manipulate sound, generating devastating sonic shock waves and entrancing people with his music, as well as trapping people with a Cosmic Energy manifestation of the musical staff. The entranced people will go on a "high" for a period of time before suffering a serious adrenaline crash that can last for days. The Capricorn Zodiarts can also use his music to resonate with certain Switches, with Tatsugami setting up a theory that Goto can find the Core Switch. When Gamou hears the hypothesis, he is impressed and bestows the Supernova powers to the Capricorn Zodiarts to increase the chance that they may succeed in this task.

After becoming one of the Horoscopes, Goto tracks down JK to convince him to reform their band as the new Gene God Dark Night Carnival after discovering that JK is hosting the popular DJ Gene internet radio show, improving JK's singing and his guitar playing through his Capricorn Zodiarts form's powers. However, Goto really wants to use the radio show as a means to brainwash their listeners into becoming crazed fans, though it begins to weaken them overtime. When JK discovers this, he tries to cancel the program, but Goto reminds him of his father's past, which changes his mind, and JK quits the Kamen Rider Club upon revealing they will have a live show a few days later. However, Gentaro, having been taught a song by JK's father that he used to sing to his son when growing up, manages to get through to JK who realizes that he should not be attaining his dream like this. Despite Gentaro's poor guitar skills, JK's terrible singing and the Capricorn Zodiarts' jeering, Gentaro manages to break his spell on the student body, whom all flee when they see a Zodiarts nearby, thus infuriating him. He battles Kamen Rider Fourze once more, but with JK's return to Gentaro's circle of friends, he is able to utilize Cosmic States once more and the Capricorn Zodiarts is defeated before he can even use the Supernova abilities Gamou gave him. Goto is then spirited away to Gamou's headquarters where his Capricorn Switch is confiscated and his memory erased, rather than being banished to the Dark Nebula, as he confirmed the Core Switch is still active.

His surname is pronounced similarly to the English word "goat" (ゴート, gōto). Additionally, his rock star name "God" is a reference to Kamen Rider X's antagonists Secret Organization G.O.D., as JK's namesake is Kamen Rider X's Keisuke Jin.

Tojiro Goto is portrayed by Ryousuke Kawamura (川村 亮介, Kawamura Ryōsuke).[28]

Erin Suda (エリーヌ須田, Erīnu Suda) is a third-year student at AGHS who transferred to AGHS from an American school. She is an elite student, although she is not perfectly fluent in Japanese. She came to the school to pursue her dreams of becoming an astronaut like her father prior to his retirement before even getting the chance to go into space by participating in the school's annual Astronaut Selection Exam (宇宙飛行士選抜試験, Uchūhikōshi Senbatsu Shiken). Found by the Libra Zodiarts, Erin is given the means to evolve into the Aquarius Zodiarts (アクエリアス・ゾディアーツ, Akueriasu Zodiātsu). As the Aquarius Zodiarts, she is armed with a whip called Nectar (ネクタル, Nekutaru) and the vases of water on her shoulders can be used to heal herself or others, making her immune to even Limit Breaks from Kamen Rider Fourze Cosmic States unless both vases are shattered at almost the same time. She meets Gentaro and quickly befriends him, but is distressed after learning her new friend is also Kamen Rider Fourze, someone whom she is tasked to eliminate. Upon meeting Yuki during the Astronaut Selection Exam, Erin expresses utter disdain towards the girl as she reminds her of a colleague of her father's, a people-person she sees has robbed her father of his last chance to go to space. Her disdain of Yuki grew further after a misunderstanding where she thought Yuki had sabotaged her in the exam. On the contrary, thanks to Yuki's clever thinking, Erin is actually saved by Yuki instead. Though she eventually manages to make peace with Yuki, Erin states that they cannot be friends, due to her respect and dedication to Gamou as a Horoscopes member. These conflicting sentiments lead her to a conclusion that one of them must fall, which ultimately leads her to have a final showdown with Gentaro. She is eventually defeated when both vases on her shoulders are shattered, robbing her healing abilities once and for all. After being defeated by Fourze Cosmic States, the Virgo Zodiarts spirits Erin anyway to take her Aquarius Switch and erases her memory of the whole ordeal. Soon after, unable to attend Miraikan alongside the latter, Erin meets Gentaro and Yuki while starting her friendship with them anew.

An anagram of her name "Erin Suda" is "Eridanus", a river in Greek mythology that is sometimes associated with the myth of Aquarius the Water Bearer.

Erin Suda is portrayed by Karen Takizawa (滝沢 カレン, Takizawa Karen).[29]

Yuta Sugiura (杉浦 雄太, Sugiura Yūta) is a third year student and AGHS's student body president, having replaced the previous president Sayaka Mibu after she is hospitalized. While participating in the school's annual Astronaut Selection Exam, Sugiura is found by the Libra Zodiarts whose Eye of Laplace show him to have the potential to evolve into the Taurus Zodiarts (タウラス・ゾディアーツ, Taurasu Zodiātsu). He hold steadfastly onto the school's policies of allowing as much freedom as possible to the student body previously and constantly bickered with Sayaka over idealistic differences. This eventually indirectly led to her being injured and hospitalized and to everyone's surprise, he lost his cool, seriously panicked and rushed to Sayaka's side immediately after hearing the news from Shoko. With his newfound powers, motivated by his feelings for Sayaka under the delusion that he is doing it for the right reasons, Sugiura creates the Amanogawa Campus Bylaws, various rules that limit the individuality of the student body. As the Taurus Zodiarts, his main power is to force people into keeping with a contracted promise through the use of his scepter called Gu-anna (グアンナ, Guanna) as well as taking people's souls and turning them into loyal drones. He is also physically imposing, being both strong and fast in executing short range attacks. Sugiura nearly manages to get the entire school under his control before Gentaro gets Sayaka to convince Sugiura to break his hold, through her breaking a list of bylaws he imposed. Sugiura finally breaks down before her and Gentaro as he is incapable of punishing her for he terrorized the school for her sake in the first place. Though the Virgo Zodiarts offers him a final chance to redeem himself, the Taurus Zodiarts opts to fight the senior Horoscopes instead before being sent into the Dark Nebula. Though later revealed to be alive and in suspended animation within the M-BUS, Sugiura's Taurus Switch is given to Gamou.

The kana that make up Yuta Sugiura's name すぎうらゆうた can be rearranged to form たうらすぎゆう, or Taurusu Gyū (タウラス 牛, Taurus Bull).

Yuta Sugiura is portrayed by Kenta Itogi (絲木 建太, Itogi Kenta).[30]

The Gemini Zodiarts (ジェミニ・ゾディアーツ, Jemini Zodiātsu) is a doppelgänger of Yuki Jojima known as "Dark Yuki" (闇ユウキ, Yami Yūki), created when Yuki is forced by the Libra Zodiarts and the Leo Zodiarts to activate a Zodiarts Switch. As a result, instead of melding into her Zodiarts body, the Gemini Switch causes the darkest aspects of her personality to be given a physical form that is identical to Yuki, but with a white mask that has blank expression on her face. Due to Yuki's passion for space, Gamou sees Dark Yuki as a kindred spirit due to Yuki hearing the Presenter as he had. As the Gemini Zodiarts, she has an unorthodox fighting style and is armed with two types of exploding cards: Red cards known as Lynceus (リュンケウス, Ryunkeus) that explode upon contact and the blue cards called Idas (イーダス, Īdasu) that explode as the Horoscopes wills them to. Her Supernova ability allows the Gemini Zodiarts to produce a clone of herself that doubles as a living explosive. As a result of the separation, while acting on Yuki's darkest desires, Dark Yuki reveals that she has a 24-hour window to usurp Yuki as the dominant aspect while the original self ceases to be. Though she succeeds in that retrospect, taking everything Yuki has for her own, Dark Yuki loses her dominance over Yuki thanks to Gentaro giving the girl a very strong memory to reverse the process. After Dark Yuki is destroyed, Tatsugami retrieves the Gemini Switch for Gamou.

An alternate romanization of Yuki Jojima's name is "Yuuki Jousima", which is an anagram of "I am Soujikyuu"; Sōjikyū (双児宮) is the Japanese name of Gemini in astrology.

Dark Yuki is portrayed by Fumika Shimizu (清水 富美加, Shimizu Fumika), who also portrayed Yuki Jojima, while the character's voice is provided by Hiromi Konno (今野 宏美, Konno Hiromi).[31]

Ran Kuroki (黒木 蘭, Kuroki Ran) is a new first-year student who is proficient in swimming and aikido. Though Gentaro tries to befriend her and her best friend Haru Kusao, she rejects his friendship outright due to a bad experience with senior students from her old middle school, that convinced her to trust no student older than her and to protect Haru. However, Ran's ideals led to Haru to embrace being the Musca Zodiarts as he rejects her pleas to discard the Zodiarts Switch so she can protect him. When Haru throws away his friendship bracelet into the river, Ran goes to look for it on her own while refusing Gentaro's help. But after Gentaro found the bracelet with the Kamen Rider Club's help, having not told him what she iss looking for, Ran decides to put her trust in her new seniors. Ran is able to snap Haru out of his madness by apologizing for making him feel weak and useless through her protection, allowing Kamen Rider Fourze to destroy the Musca Zodiarts without any further psychological problems to deal with later. Afterwards, she and Haru both ask to join the Kamen Rider Club, and they are made provisional members until Haru is fully recovered.

Ran is later revealed to be the last predestined member of the Horoscopes: the Pisces Zodiarts (ピスケス・ゾディアーツ, Pisukesu Zodiātsu) with the ability to liquify herself, swim through solid surfaces, and shoot high pressure water streams. Though Hayami attempted to keep her from becoming the Pisces Zodiarts, Ran is forced into transforming regardless when the Leo Zodiarts brutalizes the principal, as she sees no other way to get out of the situation and save the principal. Though a member of the Horoscopes, her Pisces Switch starts out colored blue to signify its immaturity. Additionally, Ran still considers herself a part of the Kamen Rider Club and resolves to use her newfound powers to fight Gamou and Tatsugami. However, this is all eventually revealed to be a setup, as the Hororscopes need her to activate the switch willingly, as the Pisces Switch will not awaken unless activated and used willingly by the Switcher. Principal Hayami has Tatsugami abduct Haru to force Ran into fully maturing her Pisces Switch before taking it from her. Ran is later taken to the hospital where Haru looks after her before she returns to school and becomes an official Kamen Rider Club member with him.

When Ran Kuroki's name is literally translated, the meanings are "unbarked lumber" (黒木, kuroki) and "orchid" (蘭, ran); the initials of these, "U" and "O", are the Japanese word for "fish" (魚, uo), the symbolic representation of Pisces.

Pisces in the series was a proficient hand-to-hand combatant. In the movie however, he/she instead used a double ended Trident-like weapon

Ran Kuroki is portrayed by Rin Honoka (ほのか りん, Honoka Rin).[32]

Lem Kannagi (レム・カンナギ, Remu Kannagi) is the mysterious agent of Foundation X who is the main antagonist of Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max. He searches for a mysterious substance called SOLU which is found in two meteorites that collided with the Earth. Kannagi is also responsible for the creation of the Super Evolved Lifeform Mutamits (超進化生命ミュータミット, Chō Shinka Seimei Myūtamitto), humans he induced mutation on, and the Dummy Inhumanoids (ダミー怪人, Damī Kaijin), composed of Museum Dopants and the four Greeed. He operates in a lab in the Exodus (エクソダス, Ekusodasu) spaceship. Kannagi also demonstrates the ability to utilize his breath as a repelling or attracting force, or to dissolve unprotected humans. Upon gathering the items needed for his master plan, Kannagi betrays Foundation X to carry out his scheme to rule the world.

He eventually gains the ability to transform into Super Gingaoh (超銀河王, Chō Ginga Ō) by using the Gingaoh Driver (ギンガオードライバー, Gingaō Doraibā), also known as the Medal Switch Driver (メダルスイッチドライバー, Medaru Suitchi Doraibā) due to utilizing both Kamen Rider Poseidon's Core Medals and the SOLU Switch (SOLUスイッチ, Soru Suitchi). In this form he becomes able to stop time with the powers of the Core Medals from the future, though this ability is ineffective against Kamen Rider OOO Super TaToBa Combo, whose Medals also come from the future. He also demonstrates a hover pack like that of Kamen Rider Fourze and the ability to remove his cape in order to turn it into a large boomerang-shaped sword. Super Gingaoh is defeated by Kamen Rider OOO Super TaToBa Combo and Kamen Rider Fourze Rocket States, sent flying in front of the Exodus and exploding when the shuttle goes through him. Super Gingaoh is based on Gingaoh (銀河王, Ginga Ō), the villain from the Skyrider movie.

Lem Kannagi is portrayed by Toru Masuoka (益岡 徹, Masuoka Tōru).

Katal (カタル, Kataru) is one of Lem Kannagi's subordinates. Foundation X experiments have turned him into a Mutamit known as Suddendath (サドンダス, Sadondasu), who resembles a dragon with a breath weapon of bright blue energy. Katal fight Kamen Rider Fourze and the Kamen Rider Club before meeting his end at the hands of Kamen Rider Fourze Rocket States's Rider Tailspin Crusher. Katal's Mutamit form Suddendath is based on the design of Suddendass of the Skyrider movie.

Katal is portrayed by Dante Carver (ダンテ・カーヴァー, Dante Kāvā).

Solaris (ソラリス, Sorarisu) is one of Lem Kannagi's subordinates. She has also been transformed into a Mutamit by Foundation X who demonstrates catlike abilities without transforming, but never transforms into full Mutamit form. Instead she utilizes a Zodiarts Switch to become a copy of the Unicorn Zodiarts. She is defeated by Kamen Rider Double CycloneJokerXtreme.

Solaris is portrayed by Sanae Hitomi (人見 早苗, Hitomi Sanae).

Chancellor Kiima (キイマ総統官, Kiima-sōtōkan) is Lem Kannagi's superior in Foundation X. She is killed by Kannagi after his agenda to take over the world is exposed.

Chancellor Kiima is portrayed by Azusa Watanabe (渡辺 梓, Watanabe Azusa).

The Space Ironmen Kyodain (宇宙鉄人キョーダイン, Uchū Tetsujin Kyōdain) are the first two evil Space Ironmen who suddenly became activated and gained their own personalities, seeing themselves as superior to humans. Before dying from his injuries, Professor Blink has XVⅡ remove the Kyodains' functions and send them to Earth as humans. However, creating the organization OSTO Legacy (オスト・レガシー, Osuto Regashī) as a front, the Kyodain employ the Kamen Rider Club to restore their full abilities and use XVⅡ to launch an attack on Earth. Though destroyed, the Kyodain resurface as members of Space Shocker during the events of Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z. However, due to their sense of honor and desire to fight Gavan, the two are destroyed by Space Ika-Devil for acting against their cause.

Groundain (グランダイン, Gurandain) is the blue car-like older brother of the Kyodain who was forced to assume the identity of Harumi Saeba (冴葉 晴海, Saeba Harumi), the general manager of OSTO Legacy. He tricks the Kamen Rider Club into disabling XVⅡ so he and Skydain can regain their abilities. As Groundain, he is armed with a powerful cannon built into his chest called the Grounblaster X (グランブラスターX, Guranburasutā Ekkusu) and has the ability to use his Cosmic Energy to summon Dustards like the Horoscopes. Groundain is able to transform into a car-like form known as the Grouncar (グランカー, Gurankā).

Groundain and his ability to transform into a car is a homage to Grounzel from Space Ironman Kyodain.

Groundain and Harumi Saeba is voiced and portrayed by Kohki Okada (岡田 浩暉, Okada Kōki).

Skydain (スカイダイン, Sukaidain) is the red jet-like younger sister of the Kyodain, who acts in her human form as Shizuka Shirayama (白山 静, Shirayama Shizuka), Saeba's personal secretary. Like her brother, she gains her own personality and wants to rebel against humanity. She is armed with built-in blades in her arms called the Skycutters (スカイカッター, Sukaikattā). Skydain is able to transform into a jet-like form called the Skyjet (スカイジェット, Sukaijetto) that has the ability to fire the Skymissiles (スカイミサイル, Sukaimisairu).

Skydain and her ability to transform into a jet is a homage to Skyzel from Space Ironman Kyodain.

Skydain and Shizuka Shirayama is voiced and portrayed by Ayumi Kinoshita (木下 あゆ美, Kinoshita Ayumi).

Black Knight (ブラックナイト, Burakku Naito) is the third Space Ironman created by the Alicia Federation who works alongside an agent from the Alicia Federation named Inga Blink. Unlike the Kyodain, Black Knight had not developed at the same mental capacity and is loyal to his human partner. His strong armor making him more defense than offensive, Black Knight is armed with a rapier called the Blackest Reaper (ブラッケスト・リーパー, Burakkesuto Rīpā) and a machine gun built into his chest. Black Knight sacrificed himself in order to protect Inga and the Kamen Rider Club from the Kyodain.

Black Knight is an homage to Black Knight of the Robot Army Corps, the main antagonist from Space Ironman Kyodain.

Professor Blink (ブリンク博士, Burinku-hakase) is a scientist of the Alicia Federation who created the Space Ironmen. However, after the Kyodain were awakened with evil intentions, he commands XVⅡ to banish the Kyodain to Earth and trap them in human forms.

Professor Blink is portrayed by Ken Nishida (西田 健, Nishida Ken).

Inga Blink (インガ・ブリンク, Inga Burinku) is a female agent of the Alicia Federation and the daughter of Professor Blink dressed all in black who works alongside Black Knight. She tries to prevent the Kamen Rider Club from going into space who were deceived by the Kyodain in their human forms. Her fighting style is the same as Ryusei's.

Inga's name is an anagram for Gaburin Queen (ガブリンクィーン, Gaburin Kwīn), one of Planet Dada's Earth Invading Robot Army members from Space Ironman Kyodain.

Inga Blink is portrayed by Mikie Hara (原 幹恵, Hara Mikie).

Saburo Kazeta (風田 三郎, Kazeta Saburō) young man who possesses psychic power that is the leader of the Monster League. Due to his immense psychic power, he has the ability to become an armored larva-like mutant known as Sanagiman (サナギマン). Despite his group being supported by Banba, Saburo learns he is being manipulated after being given a device called the Zeber (ゼーバー, Zēbā), which is thought to enhance psychic powers but is actually a device that stores his psychic energy. After realizing his mistake and learning to trust Gentaro, at cost of Gentaro to throw the Fourze Driver into a lava pit to gain Saburo's trust, Saburo eventually finds the will to fight for justice and became an even more powerful blue moth-like mutant known as Inazuman (イナズマン). He defeats the Hercules Zodiarts and decides to protect the students of Amanogawa High, going as far as renaming the Monster League to the Youth League. Furthermore, the actions by future Gentaro, Ryusei and Nadeshiko in 2012 averted the destruction of the Fourze Driver while the Kamen Riders saves a past version of Saburo and his friends.

Saburo transforms into Sanagiman by shouting "Gōriki Shōrai" (剛力招来, "Summon Mighty Power"), becoming wrapped in a blue cocoon that explodes to reveal his transformed state. As Sanagiman, he is shown to be extremely durable and have superhuman strength as he is able to repel Kamen Rider Fourze's Rider Rocket Punch. He transforms into Inazuman by shouting "Chōriki Shōrai" (超力招来, "Summon Super Power") and says "the Warrior of Freedom, Inazuman!" (自由の戦士、イナズマン!, Jiyū no Senshi, Inazuman!) before battle. His attacks include the Psychokinesis Chop (念力チョップ, Nenriki Choppu) and the Lightning Typhoon (稲妻タイフーン, Inazuma Taifūn). His finisher is the Super Inazuma Drop (超力イナズマ落とし, Chōriki Inazuma Otoshi), where he stores lightning in his right hand and chops the enemy then drops a lightning bolt from the sky. Saburo tends to scream "Chest!" (チェスト!, Chesuto!) before performing a finisher.

Saburo later reappears in Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z as Sanagiman first then Inazuman, arriving from 2017 due to a mysterious anomaly caused by Space Shocker and fighting alongside Kamen Rider Fourze.

Saburo is a homage to Inazuman as he appeared in the original manga, based on the hero's human identity as Saburo Kazeta (風田 サブロウ, Kazeta Saburō). While Inazuman's design is based on the manga, the Zeber is a homage to the device that the TV version of Inazuman uses in Inazuman Flash.

Saburo Kazeta is portrayed by Kenta Suga (須賀 健太, Suga Kenta). As a child, Saburo is portrayed by Itsuki Shibuya (渋谷 樹生, Shibuya Itsuki).

Rumi Komaki (小牧 瑠美, Komaki Rumi) is a member of the Monster League and is nicknamed "Ruby" (ルビー, Rubī).

Rumi Komaki is portrayed by Kasumi Yamaya (山谷 花純, Yamaya Kasumi). As a child, Rumi is portrayed by Shiori Haga (芳賀 栞, Haga Shiori).

Daita Kondo (近藤 大太, Kondō Daita) is a member of the Monster League and is nicknamed "Kong" (コング, Kongu).

Daita Kondo is portrayed by Kazuyoshi Nakazawa (中澤 兼利, Nakazawa Kazuyoshi). As a child, Daita is portrayed by Taiga Sakamoto (坂本 大河, Sakamoto Taiga).

Chikao Nezu (根津 誓夫, Nezu Chikao) is a member of the Monster League and is nicknamed "Nezumi" (ネズミ).

Chikao Nezu is portrayed by Yuya Hara (原 勇弥, Hara Yūya). As a child, Chikao is portrayed by Hidetoshi Akutsu (阿久津 秀寿, Akutsu Hidetoshi).