[@KatherinWinter]There's a member of the team called Shadow Lass I could base some moves off of. 

http://comicvine.gamespot.com/shadow-lass/4005-1261/

Unless you just wanted to rework her character a bit and use a new iteration of her. Or you could do like I've done with Ultra Boy and make her a legacy character. Perhaps someone on her homeworld was inspired to join the Legion..?

~KL~