Rogue: (Anna Marie, last name unrevealed) Once a member of the Brotherhood of Evil Mutants, Rogue has since become a veteran member of the X-Men. After many years, she has finally gained conscious control of her power to absorb the thoughts, abilities, and memories of others through physical contact. She is currently a member of both the Avengers Unity Squad and the Jean Grey School for Higher Learning.
I actually think the color is from the effects of the experiment. Kind of like how Rogue's hair turned white from stress, I think Pietro's hair might have turned white in the same way. <<< yes I like that theory. It was in actuality caused by Aaron Taylor-Johnson's insistence for keeping Pietro's hair white like in the comics (go ATJ!!) <----- ooh this all makes so much sense