Kid Flash (Iris West)

In the alternate future of the Kingdom Come series, Iris West II is the daughter of Wally West (the first Kid Flash, third Flash) and Linda Park, and the twin sister of Barry West. Both Iris and Barry inherited their father's superspeed abilities, but only Iris chose to use her powers for good, while Barry used his powers to become a slacker and has no interest in the "family legacy". Iris is constantly bitter that her father, who has almost completely given up his life to patrol Keystone City non-stop, never makes time for her but does make time for Barry, and considered him the potential successor to the Flash identity instead of Iris, despite her becoming Kid Flash.

In the sequel The Kingdom, Iris is recruited by Rip Hunter (along with several other heroes of her generation - Damien Wayne, Batman's son; Nightstar, the daughter of Nightwing and Starfire; and Offspring, the son of Plastic Man) to try to stop a madman named Gog from altering the past, before discovering it to be unnecessary due to Hypertime.

In The Titans #23–25 she becomes a member of a group comprising the children of the original five Titans: herself; Nightwing and Starfire's daughter Nightstar; Donna Troy's son Darkstar; the Red Hood, Arsenal's daughter; and Tula, Tempest's daughter. They return to the present in various Hypertimelines to save the existence of Donna Troy.

In the Dark Nights: Death Metal - Multiverse's End one-shot, Kid Flash is one of the heroes John Stewart leads on a mission to destroy Perpetua's tuning fork on Earth-3.

In Flash #225 (October 2005), Wally West's wife Linda gave birth to a daughter named Iris. Initially, her only power is the ability to vibrate through objects. In Flash #240 (May 2008) Iris appears to grow into a teenager wearing a costume similar to her future counterpart. In issue 241, Iris now wearing a "kid flash"-like costume displays superspeed and states she may be faster than her father. However her joy is short-lived, as she ages into adulthood after defeating Gorilla Grodd. In Flash #243, Iris is returned to her original age, and her powers revert to molecular acceleration.

More than her twin brother Jai, Iris is a living conduit for the Speed Force, with absolute mastery over it almost rivaling the one briefly gained by her father during the Dark Flash Saga. Mind-controlled by Queen Bee, she exhibited the power of forming "cocoons" of Speed Force, bubbles in which she could control speed and time, freezing her targets or hastening their metabolism to death. Moreover, she repaired the weakening connection to the Speed Force that was crippling her father. Badly traumatized by her ordeal, she refuses to give in to her powers again.[1]

Her resolution wanes with the return of the first Reverse-Flash, Professor Zoom, during The Flash: Rebirth event. Since Jai's and Iris' connection to the Speed Force is still precarious, the attempts of Zoom to disrupt it force both kids to endure a large amount of crippling pain, until Iris decides to take the bulk of the Speed Power connection, freeing Jai but taking the pain for herself. At the last moment Jesse Chambers, guided by the late Johnny Quick, uses the Speed Mantra to save Iris' life, once again restoring her full potential.

Iris embraces her new role with childlike glee, choosing to take up the mantle of Impulse, which Bart used before he joined the Teen Titans as Kid Flash.[2]

Impulse is later shown being recorded on Flyover, a social networking feature devised to help villains stalk and kill teen superheroes.[3]

Iris and her brother Jai were absent from history due to the manipulations of Doctor Manhattan following Flashpoint. When Wally West returned in DC Rebirth #1 it was revealed that his wife, Linda Park, does not remember Wally, leaving the fate of Jai and Iris unknown at best. In Flash War #1 it was revealed by Hunter Zolomon to Wally that his forgotten children (and implied Bart Allen, Max Mercury, and Jesse Quick) not only existed in the altered timeline but are currently trapped in the speed force like he was. In the following issue Zoom urges a heartbroken Wally to break the speed force enough to save his family, leading to an altercation between Wally and Barry whether or not to rescue his children at risk of damaging the speed force and time once again.[4][5] Unfortunately for Wally, Zoom lied. Rather than breaking the Speed Force, the attempt broke the "Force Barrier", which unlocked hidden other forces related to the Speed Force, called the Sage and Strength Forces. Taking the power of these new forces to defeat the Justice League and the Titans, Zoom then claims that he does indeed know where the rest of the Flash family is, but Zoom withholds this information, and proceeds to claim the mantle of Flash before attacking Wally and Barry. [6]

Iris and Jai next make brief appearances in flashbacks and simulations regarding Wally while he attempted to recover at Sanctuary during "Heroes in Crisis".

Iris (in her Impulse costume) and Jai are finally revealed to exist in the DC Rebirth universe, stranded on the problematic undying planet in the ever encroaching Dark Multiverse that is seemingly connected to Wally and his actions in "Heroes in Crisis". She and Jai were emigrated to Earth 0 by Wally.[7]