9. Nightcrawler

Alan Cumming hasn’t expressed an awful lot of interest in reprising the role, and as wonderful as he was, it’s fair to say that fans would happily accept the teleporting mutant being recast as this point. The White House opening from the movie mentioned above is proof enough that he’s visually interesting enough to warrant getting more screentime, while his friendship with Wolverine was left mostly unexplored in the X-Men follow-up, so it would be great if we got the chance to see that expanded upon.