Ideally the Wolverine trilogy movies would be called: Weapon X, The Wolverine, and Logan. (Pre-X-men, as an X-man, Post-X-men). And they would all have Logan's quality.
The X-men have always worked better as an ensemble. Just look at how short-lived solo X-men comic books are aside from Wolverine. I'm not sure who could support a solo movie, I think some characters would have to be changed quite fundamentally in order to tell a story about them outside of the X-men. And the character would need a specific story to tell with a rogues gallery.
X23 obviously could work because of her connection to the Wolverine mythos - that's why they are working on a script.
Gambit has a shaky foundation, but his last solo was pretty good and he's getting a new comic with Rogue. A heist story is a good fit. The movie could draw from the thieves guild and marauders - it's not gold but it's something to work with.
Rogue has famous history with Ms Marvel. A movie about Rogue leaving the Brotherhood after absorbing someone's psyche would be compelling. Of course, Fox can't use Ms Marvel so that leaves her rogues gallery pretty weak. It's also a hard story to tell if she doesn't have the X-men's telepaths to help her deal. They would have to invent a character to replace Ms Marvel and include Xavier (or another telepath like Jean or Emma).
I'm not sure if Storm could support a film as she is now (both in the comics and films). They might want to use the Shadow King or the Adversary. But Storm's history is all over the place - will it be about Storm living on the street? Being a Goddess? - but how can you tell that without nasty cliches of Africans being savages? Being a Queen? - how do you tell that if you can't use Wakanda? Coates is writing a Storm series - I expect that a year into the comic we'll have a great guide for a Storm film, but work needs to be done first.
Cyclops has Sinister, but his identity is too tied to the X-men and his relationships (Xavier, Jean, Emma).
Teenage Jean Grey has a solo comic right now about her training and preparing to fight the Phoenix. That could potentially work, but not in the film climate we have now.
A Dazzler movie would be awesome if Fox made it about someone trying get a break in the music industry, but filled with references from the X-world. Play up the camp of a musical and break the fourth wall.
A Multiple Man movie would be awesome - make it a crime-detective story of him sending out his dupes to get information, but dealing with his own identity at the same time. I could see it with a trippy tone and concept like Momento, but a little more light-hearted and mainstream. This would be a great series.
Magik could have a movie about growing up in Limbo and overcoming Belasco's influence.
An Iceman movie could be about the intersection of being gay and a mutant. But this would be a better character arc in an ensemble. He has a solo comic series - the closest thing he has to a rogues gallery are the Purifiers and Daken.
Cable could probably support a movie, but I wouldn't be interested in it lol.
After typing all this up, I guess I would be most excited for a Dazzler, Multiple Man, or Magik movie/series. Of course, a good script could make any X-character work but the core X-characters would need a lot of changes. It would be better to develop them in an ensemble movie.
