1) Cable
If there’s one character we want to see turn up in Dark Phoenix above all the others on this list, it’s Cable. Fans have been waiting to see him in the movies for a long time and, after a tease at the end of Deadpool, the character will finally arrive in Deadpool 2, as played by Josh Brolin. But wouldn’t it be awesome if he actually ended up making an appearance twice in the same year?
You see, while Deadpool 2 drops on June 1st, X-Men: Dark Phoenix lands on November 2nd. Audiences will already be familiar with the cyborg by then and would get a real kick out of seeing the Deadpool films crossover with the mainline X-Men movies. With the Phoenix’s reality-warping powers, a cameo could be easily arranged. Cable could appear via, say, a vision of the future.
A bigger reason it should happen, though, is that it would be a hugely interesting moment for the characters. Cable is really Nathan Summers, after all, the son of Jean Grey and Scott Summers returned to the present day from the future. What would the pair do if they knew that they were going to have a son at some point? That knowledge could even be instrumental in bringing Jean back to her old self.
In short, a Cable cameo could work as either a fan-gratifying moment or a major dramatic turn in the film. It’s a win-win either way!