I can see why you'd like her
Not familiar with her character but nothing wikipedia can't cure.
I understand where you come from with the dark xmen, I'm not really sure where I stand here since I know more about the oldies. Of course Wolverine might be an exception but I remember the Madripoor series where Logan finds the remains of a plane where one of his friends was on board when it crashed, to find they've been slaughtered by pirates. He then proceed to track them down and ruthlessly kills them all. I still have that image of the whole camp literally jumping on him before he sends them flying.
I'm trying to remember the title of that xmen storyline that happens during a parallel universe medieval England, where Dr Strange is the magic advisor to the Queen and Fury the master spy, bought it a while ago but I can't recall where the hell I put it...
EDIT TO ADD
ah the New Mutants, always had a thing for Rahne !
EDIT TO ADD, again
Magik (Illyana Nikolievna Rasputina - typically anglicized to Rasputin) is a Marvel Comics character, associated with the X-Men. She is the younger sister of the Russian X-Man Colossus.
it's Illyana ! Damnit of course !!
I still remember that time where they find her spewing demons from her eyes/mouth (?), with all the other kids chasing them in the house !