10) Storm And Black Panther
The Crossover: In the comics, mutant Storm and Avenger Black Panther are long time romantic interests and were even married for a good many years (before eventually getting a divorce). Given that, it would be nice to evoke this important relationship in the movies at some point.
Now that T’Challa is starting his own film series, how about Storm pops over from Fox to appear in one of the sequels? It’s not as if Storm has been particularly well-served in the X-Men films, so such a crossover could help to properly characterize the weather witch.
Likelihood – 7/10: Surely loaning out one X-Men character to Marvel wouldn’t be too much of a problem for Fox, right? And, given the age of both Halle Berry and her younger counterpart Alexandra Shipp, a new actress would need to be found to play opposite Chadwick Boseman, so it’s not like they would even lose their star to Marvel.