I am very interested in this.
As for character concepts... Well, what about spiderman? I think having Peter Parker (or miles morales) be a mutant would be a fun idea.
IF not, there's a whole slew of characters I could do
*Nightcrawler - I'd probably make him a new student from a high society family in Germany. He grew up hidden away from almost everyone
*Colossus - Joined up with Xavier after beinga member of the Brotherhood. A genuinely nice guy, and troubled by his time with the evil group
*Banshee - Young irish punk, kicked out of his family's house at 15. Committed some petty street crime, then got hooked into being an x-men by xavier
And that's not counting Genderswapped characters
*ShadowCat - I'm thinking of making Kitty a boy. So, Kenneth Pryde instead of Katherine.
*Marvel Boy - I'm thinking of Cameron Grey, the male counterpart to Jean Grey. His family was actually quite supportive of him, and treated his mutants powers as a gift
*Armor - A male version of Hisako Ichiki. He's a firt generation american, whose parent's immigrated to San Francisco a few years before he was born. He's abit of an otaku, with a love for giant monsters and mechas.