Galaxy is an alien princess from the planet Cyandii, although she didn't get to live there for too long before needing to escape to Earth after her home planet was attacked. After hiding in the disguise of a human boy into her teenage years, she began to live as herself and, eventually, become a superhero.
Sexuality
Galaxy is in a relationship with a woman and is a lesbian!
Outside of comics, her creator, Jadzia Axelrod, has also referred to her as a lesbian multiple times on Twitter (x, x, x).
Romance
Since her first appearance, Galaxy has been in a relationship with Kat Silverberg.
Gender
Galaxy is also a trans woman!