Magik (http://en.wikipedia.org/wiki/Magik_%28comics%29) is the little sister of Colossus and an X-Man in her own right . Artificially aged in a demon dimension as a child, she's missing just enough of her soul to be creepy, which might also explain why she decided to start taking fashion advice from Marvel Now Emma Frost.
Getting The Look
Marvel Now Magik has one of those big, impractical, glowing swords you see in a lot of fantasy MMORPGs. Once you have that the rest of this look is pretty easy to put together (OK, except for the shoulders. The shoulders are hard).