I have a nice game idea, one post 4 X-related questions, the one who solves them all 4 (confirmed by the one who posted the question), will then post 4 new questions. Of course, play nice, no Google search.

I'll start.

1 - Rogue as famous for her green/black color scheme, besides a Ms. Marvel look, she once did wear a different color, when was that and what color did she have?
2 - There was once a villain written who was going to be an X-Men later (according to the writer), however it never happened and we also never saw that villain again, what was his/her name?
3 - Professor X has agreed for many villains to join the X-men, like Juggernaut, Sabretooth and Mystique. There was once a villain who wanted to join, but Xavier refused. Who was that? Small hint, that person is currently not on Krakoa.
4 - During the original Secret Wars series (way back), Colossus fell in love with another woman, what was her name?