I think it would be cool do do something with Nightcrawler. When I was a kid, I used to think he and Colossus were the coolest. Especially when the arcade game was out (the X Men side-scrolling fighter). I miss when he was more of a high-octane, swash-buckling character. Less intense and ultra-Catholic priest type. That's emotionally draining and kind of kills some of the thrill the character presents. I like to think of him more set up for intense, 80's movie style non-stop action. But also with a kind-hearted side.