Who, me? I'm not in trouble. And by the way, it's Supergirl. See? [points her chest] Super...girl. [points at her face]
~ Supergirl to Superman in "Little Girl Lost"
Supergirl was the last Argoan and Superman's foster cousin. She is a supporting protagonist in Superman: The Animated Series and Justice League Unlimited. She is voiced by Nicholle Tom.
Kara In-Ze is the sole survivor of Krypton's sister planet Argo. While exploring the space around the destroyed Krypton, Superman found Kara in a cryogenic facility and took her in as his adoptive cousin. Inspired by her adoptive cousin, Kara made a costume with Superman's logo and occasionally acted as Superman's effective sidekick in his adventures. She later becomes a member of the expanded Justice League.
Supergirl is a kind, sweet, and compassionate girl who loves to help people and fit in with others. she looks up to her cousin, Superman, and tries her best to protect him and help him protect the world from all kinds of threats. However, Supergirl is not without her flaws. In her first appearances from Superman: TAS to JLU, she was criticized for being impulsive and reckless. By the time "Divided We Fall" rolls around, she was chosen to be in charge of the League while the original seven were in custody. In "Far From Home", Green Lantern himself notes that there is nothing more he can teach her.