List of My Life as a Teenage Robot characters

Action Hero Jennifer "Jenny" Marie Wakeman (Global Robotic/Mobile Response Unit Model No. XJ-9) (voiced by Janice Kawaye) is the main protagonist and the "reliable/teenage rent-a-robot" to which the title mostly refers, a state-of-the-art sentient self-driving gynoid mech created by her mother, Dr. Wakeman, five years prior to the series. Though she was designed to be Earth's protector armed to the teeth with a wide range of weapons, devices and transformations, she desires to live the life of a normal teenager and often makes this covet quite apparent to her friends. Jenny's personality is often kind, friendly and optimistic, though this also comes with being rather naive as to her surroundings. Often, people like the Crust Cousins and Vexus take advantage of Jenny's friendliness to further their own goals, though she usually catches on and comes out victorious in the end. Jenny can also be somewhat of a sucker for trends, even when her mechanical designs prevent her from using them, as evidenced when she wanted to pierce her ears at one point despite not having any ears (Ear No Evil). Though capable of human emotions, having human facial expressions and possessing fully functional tear ducts, Jenny does not seem to possess the ability to dream or experience physical sensations; though there were two episode segments where she received those abilities, in the case of the sense of touch it caused more harm than good and was removed by the end of the episode. She is also able to speak Japanese through a language OS (in actuality it's because her voice actress, Janice Kawaye, is of Japanese descent and can speak near-fluent Japanese).

Jenny stands at 6.5 feet (1.98 m) tall (according to Dr. Wakeman in Raggedy Android) and weighs roughly 600 lbs. (revealed by Jenny herself in Historionics). She has blue pigtails with bolts connecting them to her head, blue bangs, white skin, blue "clothes" (a tank top and a miniskirt), a belly bolt (a bolt that simulates a belly button), hands with four fingers each and center holes and a "false nose". Her body processes are carried out by a fully functional, metallic electronic brain, which her eyes are connected to (as shown in the episode Mind Over Matter). Her body also contains several access ports for downloading, charging, and other purposes.

Dr. Noreen "Nora" Wakeman (voiced by Candi Milo) is an elderly robotics scientist and the one who built the XJ robots, she is often simply referred to as "Mother" or "Mom" by Jenny and her sisters. Though Dr. Wakeman does indeed love her "daughter", she'll often butt into Jenny's personal life and is known to call on her at the most awkward moments. Dr. Wakeman seems to be a sort of stereotypical embarrassing parent. She also has a difficult time with modern-day slang and other teenage fads, earning Jenny's annoyance on many occasions. At the beginning of the series, Dr. Wakeman originally insisted on Jenny's existence being kept a secret, restricting her to her bedroom outside her superhero activities, but she quickly allows her some more freedom, allowing her to socialize with human teenagers and go to public high school.

In one episode it is revealed that Dr. Wakeman has a sister "Wisteria" whom she argues with every time they meet. Aunt Wisteria believes in "fun, peace, and love" and has a strange ability to either accelerate plant life or control it. When Glenn (Wisteria's plant-like son) and Jenny staged a fight, forcing Dr. Wakeman and Wisteria to move past their differences and, for a short time, became friends.

Despite being only human, Dr. Wakeman shows no reluctance in fighting when necessary. In her youth, Dr. Wakeman was a shining officer of the global defense group "The Skyway Patrol" before retiring to Tremorton. Even in her advanced years, Dr. Wakeman is still very able, and can even hold her own in a fight against Vexus.

She has a noticeable habit of pronouncing a one syllable word as two, most notably her pronunciation of the word nine as ny-ine.

It was revealed she was a prodigy, creating her first defense droid (Lil’ Acorn) when she was 14, but then remodeling it for show business.

In "Good Old Sheldon" she uses a special machine to lower her age, but due to power restraints no noticeable difference can be seen in her appearance.

Action Hero Bradley "Bad Brad the Amazing Armor Lad" Carbunkle (voiced by Chad Doreck) is Tuck's older brother and Jenny's best friend and next-door neighbor. He is outgoing and adventurous, and is the first friend Jenny ever made. Although he usually tends to cause more trouble than he prevents, he means well and tries to help Jenny in any way he can.

Brad likes to think of himself as a "ladies' man", but he's almost anything but that, as seen when the local girls reject all his pick-up lines and it is rare for a girl to like him, but in more episodes, he develops a crush on Melody Locus, but lost her after she was revealed to be a robot herself.

Tucker "Tuck the Tin Can Man" Cornelius Carbunkle (voiced by Audrey Wasilewski) is Brad's younger brother. He is usually tagging along with his brother and Jenny, though his aptitude for adventure is significantly less than Brad's. This can be chalked up to his many childish fears, among them the dark and giant wheels. In spite of all his fears, after adventures or life-threatening experiences, he will often shout "That was awesome!" and talk about what happened. Despite initial fears of Jenny, Tuck has since warmed up to her as a friend.

Tuck has proven to be more clever than he looks on several occasions, often sweet-talking Jenny and others into doing favors.

Sheldon "Shel the Silver Shell" Oswald Lee (voiced by Quinton Flynn) is Jenny's self-proclaimed romantic admirer and friend. Though not as heavily featured as the rest of the main cast, Sheldon arguably qualifies as a core member of the group. Jenny refuses his romantic advances, though she does care for him as a close friend. Throughout the series Sheldon has saved Jenny quite a few times and helped her fight off villains; deeply grateful for Sheldon's utmost loyalty to her, Jenny has shown genuine feelings of affection for him, kissing him on the cheek twice. In an interview, series creator Rob Renzetti revealed he and his team would have loved to have seen Jenny and Sheldon as a couple before the series' premature cancellation.

Being skilled in robotics, Sheldon has created gadgets and modifications for Jenny, usually very unnecessarily bulky and extravagant, as well as doing minor repair work. He has even done more extreme modifications when requested by XJ-9, usually when Dr. Wakeman refuses to do them herself.

His skill has led to his creating a robot known as Model No. SHEL-1. Sheldon originally created him in an attempt to convince Jenny that robot boys were jerks, though this backfired when Jenny's affection for the robot grew even greater. As a hero, SHEL-1 has three qualities Sheldon lacks in his normal guise, which are an imposing appearance, a smooth demeanor and an excess of confidence.

Although his age in the series is confirmed to be 15, a mishap in the space-time continuum caused him to live 75 years in space, doing odd jobs to earn money, and even captaining a space pirate ship. Due to the theory of relativity, he returns to Earth as an old man, while Jenny and the others haven't aged a day. Using Wakeman's age reverser, Jenny accidentally de-ages him into an infant. His space pirate crew returns and takes him into space to age him further. One day later, he is 15 again. Therefore, his true age is 105.

Princess Vega (Model No. V-9) (voiced by Thora Birch) is the princess and current ruler of Cluster Prime and estranged daughter of the former Queen Vexus Cluster. She had befriended fugitive Jenny, after Jenny was able to escape out of Vexus' clutches. She and Jenny are similar as she is also a teenager and has robot friends that look just like Jenny's friends. Originally Vega generally was unaware of her mother's evilness and believed her when she framed Jenny for stealing all of the golden computer chips. However, after discovering that all the computer chips were actually in her palace she realized that Vexus was behind the whole thing. She and Jenny both fought her and got her to admit the crime, Vexus was later dethroned as queen and Vega took over. She asked Jenny to stay in Cluster Prime, but Jenny claimed that she belonged on Earth. Vega understood, but she wanted Jenny to come visit her sometime; Jenny happily promised to do that when she could.

Created by Dr. Wakeman about twenty years before Jenny, Armagedroid (Model No. XA-1) (voiced by Kevin Michael Richardson) was, for his time, the most advanced and powerful robot ever created. He is the size of a city block and possesses an arsenal of weapons, all of which to serve his programmed duty of disarming and destroying enemy weaponry.

Armagedroid was built by Dr. Wakeman during a major war between Skyway Patrol and a massive invasion of various alien attackers. Unfortunately, after the alien attackers were deflected, Armagedroid, being unable to discern friend from foe, began to destroy Earth's own weaponry out of a righteous crusade. In the end, Dr. Wakeman managed to convince her creation that the ultimate weapon was hidden at the core of the planet and he dug himself down through Earth's crust. He fell for it, and Armagedroid was supposedly gone forever.

Twenty years later he returned to the surface, apparently having ascertained that there were, in fact, no weapons at Earth's core. He was soon confronted by Jenny, but he easily overpowered his "little sister". Thankfully, in his restless search for weapons to destroy, Dr. Wakeman and Jenny managed to trick him into ingesting a proton bomb into his internal melting oven and he exploded.

Later, Armagedroid returned, having been rebuilt by the diminutive Killgore in a joint-effort towards revenge on Jenny (though it was never revealed how it was even possible for Killgore to have done that). Once again, Jenny proved that Armagedroid's worst enemy was himself, as she convinced him that he himself was a weapon. With no clue as to self-preservation or irony, Armagedroid became confused and literally tore himself apart upon hearing those words.

As a pint-sized terror with a mammoth ego, Killroy "Killgore" Mogg, is a 10-inch-tall YK-series wind-up toy robot created by Phineas Mogg who will wind down and stop functioning unless his key is turned regularly. While he considers himself an evil overlord (possibly because a card bearing the word villain is tied to his diminutive frame) most people, especially girls, find his tiny form and protestations of his terrible evil endearing. Unfortunately, he is capable of almost anything to show he really is dangerous, including reconstructing Armagedroid to do his bidding. He uses a mental attack on his enemy (e.g. repeatedly yelling "surrender!" at inconvenient and unusual places). He is also the only being to "defeat" Jenny by driving her crazy. (Voiced by Tara Strong)

The Cluster Empire is a group of robotic aliens bent on enslaving organic creatures, including humans, and assimilating other robots, especially XJ-9.

Queen Vexus (voiced by Eartha Kitt and Cree Summer) is the cunning, villainous, and manipulative queen and former ruler of Cluster Prime who is bent on the enslavement of the human race. Vexus is the archenemy of Jenny and main antagonist of the series. A sneaky android, she has assumed various disguises, including photographer in "Hostile Makeover", the robot nurse Vee in "Tradeshow Showdown", the flirtatious teenage robot QT-2 in "Designing Women", and even the transfer student Vicky in "Queen Bee". Vexus was enemies with Dr. Wakeman. First appearing in "Hostile Makeover", Vexus infected Jenny with a V-series nanobot, transforming her into a giant monster and using her as her slave. Vexus’ plan is foiled when Wakeman manages to short-circuit her creation and remove the nanobot. She later showed up in "Tradeshow Showdown" where she assimilated all the robots in the convention, only for Jenny to deactivate every single one of them. Eventually, in "Designing Women", Vexus grew tired of Jenny always defeating her drones with the seemingly endless gadgets she can pull out at will. In disguise as "QT-2", Vexus tricked Sheldon out of Jenny's master blueprints (which he originally stole to find the way to her heart). Vexus nearly had Jenny beat, now able to calculate her every move, but some quick thinking outside the box left Jenny the victor in the end.

In the TV movie "Escape from Cluster Prime", Vexus attempts to bring Jenny into the Cluster on the tricentennial of Tremorton. When the fight is over, Vexus escaped via teleporter on her hovercraft. After the townsfolk shun Jenny for the damage to the town and the ruined festivities, Jenny is left to clean up the mess, and she accidentally stumbles through the Cluster portal, landing in her enemies' home planet. Completely unaware of this turn of events, Vexus finally loses patience and pulls a full-scale invasion of Earth. During Jenny's time on Cluster Prime, she realizes that Vexus has been lying to her people. There, the robot XJ-9 has been painted as the barbaric android who stole the planet's supply of golden computer chips (the part that functions their weapons systems), when it was really Vexus who was guilty of the crime (however, comically because of the barbaric overtones in her poster, no one on Cluster Prime even realized she was XJ-9). In the end, Vexus was overthrown, and it is assumed her benevolent daughter, Princess Vega, took the throne.

However, Vexus appears again in "Trash Talk" and "Queen Bee", repeatedly attempting to exact her revenge of Jenny for her loss of power. In the former she is clearly starting to lose control of her mind, creating a spaceship for escape that could only contain a hamster. Later, Vexus returns to Tremorton and pretends to be "Violet" at Tremorton High, but Jenny was able to recognize her without even having to remove her disguise. The Crust Cousins run into Vexus, and take her with them, and she would learn slang. On the next day, Brit & Tiff introduce Vexus as "Vicky", and she was able to beat Jenny in "fitting in and being popular". However, Vexus (disguised as "Vicky") was becoming even more popular than the Crust Cousins themselves. She had nearly defeated Jenny by using disruptors placed around the school by Brit & Tiff. The Crusts had no other choice but to remove the devices they had planted earlier, so they wouldn't "remain as social outcasts". Vexus is left buried in a pile of ice cubes, but she was no longer popular when Jenny told the students that their "queen was two thousand years old".

Commander Smytus (Voiced by Steven Blum) made his first appearance in "Dressed to Kill" where an accident on his ship caused him to lose a case of super-powered Pip-Crystals; the crystals landed on Earth, especially on the dresses Brit and Tiff Crust were examining for the upcoming prom. With the Crust cousins in control of the crystals, Smytus quickly lost and was shrunk to the size of a beetle (it is unknown how he later returned to normal). The fight over the Pip-Crystals ended with Jenny cleverly showed the Crust cousins an article deeming crystals out of style, and the crystal-covered gowns were locked away. Later, Smytus managed to catch Jenny in a trap and then assimilate her into the Cluster, an act that sent out a distress signal which automatically reactivated prototypes XJ-1 through -8. Smytus failed to assimilate the prototype XJ robots but they brought out several sticks of dynamite, barrels of gunpowder, proton, nuclear, fuse and time bombs which dumps them on the giant assimilated Cluster possessed Jenny, resulting in a huge explosion, killing her.

In "Escape from Cluster Prime", when Vexus launched her invasion on the Earth, Smytus was put in charge of enslaving everybody on Earth and putting them to work building more robots for their army. When Brad and Tuck rounded up a mini coup to force the Cluster to leave, Smytus set to detonate Earth instead. Once Jenny had left Cluster Prime free of Vexus and with their golden computer chips returned, she came back to save Earth from being blown up. In a last resort, however, Smytus set himself to self-destruct, but Jenny evacuated his ship of all her friend and allies, and then she tossed Smytus' ship deep into space where the resulting explosion wouldn't harm her home world. Smytus somehow survived his own detonation and appeared again, along with Vexus and Krackus, on a garbage asteroid. When Jenny happened upon that asteroid in "Trash Talk", Vexus planned to drain her of her energy, but the three got into an argument over how to use it.

Krackus (voiced by Jim Ward) is a crackpot inventor of the Cluster and seen as a joke, even by his own race, as his creations are known for falling apart. His first appearance was in "Around the World in Eighty Pieces", though Jenny had obviously dealt with him before, as the dialogue suggests. In this episode, Krackus appears to be rather absent-minded, as he continues to forget Jenny's name. However, he actually manages to do something productive for the Cluster in this episode: cause Jenny to literally fall to pieces and scatter her pieces across the world; only her head and hands were rescued from the scattering by Brad, Tuck, and Sheldon. Krackus planned on hailing Vexus immediately to summon an invasion, but his communicator fell apart as he tried to call her. Jenny managed to gather up all her pieces before Krackus fixed his communicator except a critical part that held her together, but she and her friends manage to fool Vexus and Krackus with some clever thinking, and the queen angrily pulled the inventor back to Cluster Prime before either could become the wiser.

In "Toying with Jenny", he teamed up with Vexus and disguised themselves as G. Petto in order to trick Jenny into making toy versions of her, which were evil toys to destroy her. However, Brad and Tuck find the master power switch and shut the toys down.

In "Escape from Cluster Prime", he was sent to unleash nanobots he invented to torment the citizens of Tremorton. However, the citizens find ways to defeat them. Later, he was on board Smytus' ship when he detonated, but he too survived, somehow. He appeared again in "Trash Talk", where he took part in Vexus and Smytus' scheme to drain Jenny's energy.

The Space Bikers are a gang of alien bikers (most of the gang is made up of women, while only one of them is a male) who like to cause mayhem on Earth. However, it was revealed in the third season that all five of the gang work at a school on their home planet, and their homeworld is much like Earth, and that their role as bikers is merely just a hobby.

The leader of the Space Bikers, voiced by Grey DeLisle.

The biggest, fattest and strongest of the Space Bikers. She speaks with a German accent and a low voice. Voiced by Milo.

The thinnest, big handed and glassed eyed of the Space Bikers. She speaks in a medium-pitched voice. Voiced by Milo. She was seen in The last of us.

(Voiced by Kawaye) Tammy is part of Letta's Space Bikers gang who speaks in a high, squeaky voice. In their introductory episode, she is stated to be the newest member. She had a crush on Brad, as revealed in the episode Ball and Chain, where she tries to force Brad to marry her.

The smallest of the Space Bikers, and acts as Letta's pet, as he is usually on a leash.

Mr. Vladimir Scruffles is one of Dr. Wakeman's lab rats. He and his mice army are a reference to Vladimir Lenin and the Bolsheviks. Mr. Scruffles speaks in a distinct Eastern European accent and bears a grudge against the elderly scientist for mutating his and the other lab rats' front paws and tails in Mickey Mouse fashion. He first appears in "Pest Control" where he leads the many rats in a coup d'état of Jenny's body, leaving her disembodied head behind in her bedroom, to destroy Wakeman. Jenny managed to defeat Vladmir and his army (with her head attached to Tuck's r/c race car) by luring them into the swimming pool where the rats' natural instincts forced them to "abandon ship" (Jenny's body). Wakeman kept Vladimir for further experiments while his comrades were taken away by Pest Control. Apparently his mutated look is a reference Disney's "Mickey Mouse".

Vladimir returns in the season three episode "The Legion of Evil" where he forms a group of Jenny's old foes—Lancer, the Mudslinger, and the Mad Hammer Brothers—to exact their revenge on Jenny and steal a priceless Egyptian pillow made entirely of diamond. Their plan is thwarted when Brit and two other students—Jenny's partners for a history project at school—come to her aide.

Dr. Phineas Mogg is a scientist who has a bitter rivalry with Dr. Noreen Wakeman that dates way back. Apparently, Mogg has had a history of ripping off Wakeman's experiments, or "perfecting them", as he prefers it. Mogg first appeared in "Tradeshow Showdown" where he insulted Wakeman and is unimpressed with Jenny. However, his attitude changed about her when she defeated Vexus' army, and he later set to work on designing his own version of her. As a result, Mogg’s robot son, YK-9, or “Kenny” as he renames himself, makes his appearance in "Love 'Em or Leash 'Em", designed to be the perfect teenage robot boy — though he is also programmed to be part dog. Jenny and Kenny fell in love and secretly started dating; but Jenny broke up with Kenny when their parents disapproved, and when Jenny found out about Kenny’s canine programming.

Kenneth "Kenny" Mogg (Model No. YK-9) (voiced by James Arnold Taylor) is an android boy designed by Dr. Phineas Mogg. When he and Jenny first meet, the two teenage robots immediately take an interest in each other. Kenny proves to be very sweet and loyal to Jenny, including using his powers to make the pizza when the party they attended was nearly ruined by a broken oven. However, Kenny had numerous strange behaviors such as showing affection with his tongue, having a peculiar interest in fire hydrants, and howling at the moon. This caused Jenny to realize that her date was part dog (before she had a dream that they would get married, live in a giant dog house, and a stork delivered their robotic puppies before Kenny was taken away by the dog catcher). Jenny kept going out with Kenny due to how popular being with him made her. This soon attracted the jealousy of Sheldon. After several failed attempts to expose the truth about Kenny (including dressing up in a cat suit and getting Kenny to chase him), Sheldon finally ran into Mogg while the scientist was looking for Kenny, and Mogg dragged his robot son home to be punished. Kenny was again seen in Agent-00 Sheldon, wherein he was one of the captured robots that was sent to destruction by an evil secret organization.

Brittany "Brit" (Voiced by: Moira Quirk) and Tiffany "Tiff" Crust (Voiced by: Summer) a.k.a. The Crust Cousins, are two bullies who are Jenny's classmates and rivals. Brit exposes stereotypes of the stuck-up rich girl with a London accent whereas Tiff acts like a street-smart punk girl who speaks in African-American Vernacular English despite appearing Caucasian, although creator Rob Renzetti confirmed in a fan-reply on Twitter that Tiff was indeed biracial. These two are the popular girls in school and will do anything to humiliate Jenny (even getting help from the Mudslinger, a grungy reporter, at one point). They and Jenny are still rivals even though Jenny did save them at least a couple of times (even without getting a "thank you"). Upon first meeting them, Jenny was eager to be friends with Brit and Tiff and was oblivious to their displeasure towards her, but she soon began seeing them as they truly were and became their biggest rival at Tremorton High. The girls become the main villains in the season one episode "Dressed to Kill" when they harness the power of the Pip Crystals, a highly powerful and dangerous space mineral lost by the Cluster's own Commander Smytus, which were sprinkled all over their prom gowns. The fight over the Pip-Crystals ended when Jenny cleverly showed the Crust cousins an article deeming crystals out of style, and the crystal-covered gowns were locked away.

In the season 2 episode "Victim of Fashion", Jenny and the Crust Cousins engage in a "down and dirty fashion war" in which Jenny downloads all the latest styles into her transformation data banks to upstage her competition. It was when the Crust Cousins pulled the thin look to counter all of Jenny's "bigger and better" outfits that Jenny had Sheldon remove her weapon systems ("It's better to be fashionable than functional"), ultimately making herself vulnerable to the Space Biker Gang. On the day these events took place, Britt and Tiff had dressed as motor unicycles to "beat [Jenny] at the transformation game," prompting the Space Bikers to use them as their getaway vehicles. It is unknown how and when they were rescued and returned home.

Amidst the many pranks pulled between the Crust Cousins and the newly formed duo of Jenny and Misty, the former member of Teen Team who returns in "Teenage Mutant Ninja Troubles," it is revealed that Brit is afraid of heights, Tiff is afraid of spiders, and both are very afraid of nerds. The cousins play very minor roles in the TV movie Escape from Cluster Prime, siding with whatever side appears to have the upper hand at the time. They get their justice for their flip-flopping "loyalty" when they are caught in the dust fallout from the explosion of the robot factory, ruining their outfits. In the season three episode "Queen Bee," the Crust Cousins help Vexus (disguised as a teenage robot named "Vicky") to become cool at Tremorton High in order to initiate a plan to destroy Jenny under her radar. However, they ultimately save Jenny when Vicky becomes even more popular than them.

Pteresa, Jantrice (both voiced by Milo) and Stephanie (voiced by Summer) are divas at Tremorton High School who hang with each other and, like the Crust Cousins, hate Jenny. Pteresa is Caucasian while Jantrice is Asian-American and Stephanie is African-American. Despite being background characters, Pteresa was the focus of the season 3 episode The Price of Love, where she was a fake date of Sheldon in order for Sheldon to deliberately make Jenny jealous. It eventually backfires, as she repeatedly extorted Sheldon for money to the point that Sheldon has to sell everything he owns to get his money back and Pteresa eventually goes with Jenny's one-off date Sebastian after an argument between Jenny and Sheldon. A running gag in the series is that everyone forgets that the P in Pteresa is silent, much to her frustration.

Donald "Don" Prima (voiced by Flynn) is a student in Tremorton High School that is admired by many girls for his good looks. He is, however, self-centered and doesn't care about the girls he dates at all, shown when he freaks out about a scuff mark on his shoes than to Jenny's feelings. (Though not necessarily, as he was impressed by Jenny's boom-box feature in Return of the Raggedy Android). He dislikes geeks and nerds such as Sheldon, and often hangs out with the Crust Cousins. His name is a masculine play on "prima donna".

Melody Locus (Model No. M-9) (Voiced by Sandy Fox) is an android girl with an exo-skin which makes her look like a normal teenage girl (similar to when Jenny wore hers). Melody appears as a sweet and polite girl who falls in love with Brad. However, despite the fact that Melody is desperate to fit in and act as a normal girl, she has a bad temper, finally revealing her true hideous robotic form beneath her exo-skin. She possesses many dangerous robotic weapons that rival Jenny's power. Melody was created by the villainous mad scientist, Dr. Locus, who is also her father.

Jenny is the ninth robot of the XJ series, which means that she has eight "sisters" who are actually experimental prototypes of Jenny. XJ-9 is referred to as the oldest, despite being made last. As the idea of XJ-9 was conceived from each of them, she is the oldest sister in that sense.

• Model No. XJ-1 (voiced by Kawaye) is a simple machine shaped like an egg. She is the infant of the XJ series, as her design (featuring one teething tooth and what looks like diapers) shows. Unable to speak, she communicates in a series of beeps and whistles, similar to the robot R2-D2 from Star Wars fame and similar to Big Fat Baby from Histeria!. She also shoots ink out of her mouth when she sneezes, following is XJ-4 cleaning up after her mess.
• Model No. XJ-2 (voiced by Kath Soucie) is a small, two-year-old ray gun. She frequently hiccups lasers. Her design is probably a prototype to Jenny's many lasers.
• Model No. XJ-3 (voiced by Soucie) is a small, crudely made humanoid robot. As an early prototype, she easily falls apart and lacks some balance. Her design is Dr. Wakeman's first attempt at a humanoid robot, though she resembles a toddler.
• Model No. XJ-4 (voiced by Soucie) is an octopus-like robot who is a neat-freak. She has a neatly square head with several tentacle-like arms underneath and a straight, upward ponytail with one rather-large bow. The head is situated on a stalk with a wheel on the end. Instead of weaponry, she has various cleaning gadgets (like a dust pan, a mop, a broom, and, rather obviously, a vacuum cleaner). She seems to be based on the idea/stereotype that many future robots will be domestic helpers. All XJ robots starting from her have the ability to speak understandable English. Her age is presumably designed around possibly early childhood.
• Model No. XJ-5 (voiced by Soucie) is a literal chatterbox. She looks old-fashioned with a radio dish on the bottom and rocket-pigtails (like XJ-9's), enabling her to fly. She constantly talks and makes comments, sometimes to the dismay of the people around her. However, she also makes an excellent leader, as shown in several episodes. She was probably designed around possibly mid- to late childhood.
• Model No. XJ-6 (voiced by Milo) is one of the more abstract of the XJ series. She has a monitor for a face with one green eye, one arm and three spider-like legs. Her design seems to be based on the distorted view some teenagers have of themselves. She is very jealous (especially of XJ-9) and speaks with somewhat of a Valley-girl accent. She was designed as an early adolescent.
• Model No. XJ-7 (voiced by Wasilewski) is a mopey, bulky robot. She has caterpillar tracks for locomotion. She is a very negative robot and doesn't believe in herself. She is based on teenagers with extremely low self-esteem. She was designed, also as an early adolescent, however now starting to go through the emotional changes of puberty. Her sadness is akin to Eeyore of Winnie The Pooh.
• Model No. XJ-8 (voiced by Wasilewski and Keith Furguson) is a large android girl and the closest to XJ-9 by age. She looks like a bulked-up, tomboyish XJ-9 and talks like the stereotypical robot, monotonous with a bit of static reverb. She has superior strength, higher than XJ-9's. Apparently, Dr. Wakeman had to take out some strength in XJ-9 to add in Jenny's quirk and charm. She is based on the stereotypical robot with some feminine touches (though not a lot). She was designed as an adolescent partway through the age period parody of Obadiah Stane/Iron Monger, Biger of Gargantar Mech, Baymax and Gizmoduck. Her stereotypical robotic voice is akin to the Ultimate Robotic Vehicle (U.R.V.) from Rescue Heroes.

The XJ robots make their first appearance in the first-season episode, "Sibling Tsunami", and go on to appear in "Sister Sledgehammer", "Agent 00’Sheldon" (mostly cameo), and notably "Turncoats." (XJ-8 also appears briefly in "There's No Place Like Home School").

• Model No. XJ-10 is unseen in the series, though was mentioned a few times, such as in "Sibling Tsunami" (jokingly by Dr. Wakeman). In the Christmas special "A Robot of All Seasons", a blueprint of XJ-10, which Wakeman quickly covers when Jenny enters the room, is revealed. As shown in the blueprint, XJ-10 would have had a triangular build with more pointed features and crab-like pincers for hands. However, XJ-10 was never completed and the project was abandoned, which makes Jenny the last of the series. Despite not appearing in the series, she appeared as an action figure.

The Skyway Patrol acts as a global defense/ law enforcement group in the series. They are often seen harassing XJ-9 for "unauthorized" aviation. In one episode it is revealed that members of this organization often have to deal with literal mountains of paperwork in order to do virtually anything. This usually makes them more of a nuisance than help. As a matter of fact, a jealous skyway patrol lieutenant wanted to convince the leader, General Hardscape, to have Jenny permanently shut down, only to succeed in being demoted to private. He kept trying to have Jenny shut down until, in A Spoonful of Mayhem, he was fired from the force.