From LEGO Batman Wiki
Supergirl is the hero unlocked by finding all Gold Bricks in the Xbox 360 version of LEGO Batman 2: DC Super Heroes
Supergirl looks like Superman except for a few differences:
- Supergirl has long hair, similar to that of Poison Ivy and Vicki Vale except blonde.
- Instead of abs, she has breasts.
- She has a red skirt and red boots, with bare legs.
Supergirl's real name is Kara Zor-El, and she comes from the planet Krypton as well as Superman. She is only unlocked after collecting all Gold Bricks in the Xbox 360 version of LEGO Batman 2: DC Super Heroes. She has a slightly differently fighting style to Superman, but she does have all his powers.