Kara Zor-El (Earth-1955)

"Some of us try hard to make the world a better place than it was when we found it. I know that's what I try to do. I won't always be successful. But that's life. I'm Supergirl. This is my life ... and y'know what? I'm pretty happy with it. For now at least."

- - Supergirl to Spider-Man

Kara Zor-El was born to the renewed scientist Zor-El, the brother of Jor-El and the uncle of Kal-El. When Krypton was being consumed by Galactus, Zor-El had to ensure his daughter would survive, sending her with a cryogenic pod to a safe haven. Colliding with a asteroid, Kara was scrapped on Earth for years until her cousin Kal-El, going by the name of Superman and now on Earth, found and saved her. Inspired by him, Kara took the name of Supergirl and started to protect Metropolis as a vigilante, both alongside Superman, with other superheroes, and alone.