Maybe Harley Quinn then.
Yes, much more suited to Summer Glau, IMHO
My biggest problem with Glau is actually the fanboys. Anytime they can they drag her out as THE choice to play X.
She was cute in Firefly. She kicked ass in Firefly. So, of course, the fanboys love her.
But, she's not that great. She was good as River. She's fine as the Terminator thing. But, her perpetually child like voice is becoming annoying for a 30 year old woman.