Karla Sofen

Dr. Karla Sofen (also known as Moonstone, Meteorite, and Ms. Marvel) is a villainess turned anti-heroine of the Marvel Comics universe who is a nemesis of Hulk and once disguised as Captain Marvel for a large amount of time, manipulating her allies. Like many other Marvel villains, she eventually redeemed herself and joined the Thunderbolts. She is the archenemy of Carol Danvers.

Cosplay of Karla Sofen / Moonstone (third).

Moonstone is a former psychologist who got her powers from a fusion with a gravity stone designed by the alien Kree. The character has been depicted as both a supervillain and an anti-hero at various times in her publication history.

She was created by Marv Wolfman and the late Frank Robbins, and first appeared in Captain America #192 in September of 1975.