Sunspot — charming guy w/cool powers, lost-love Julia, and reluctant ties to the Hellfire Club. That could be mined for stories.
All the other characters lack depth. Bishop is just another guy from future w/gun. Sunfire was always pissed off and arrogant for unspecified reasons. Rictor, like most 90s kids, was just “there.”
Not saying those characters couldn’t be developed but X-men needs characters that go beyond the “plot + posing” formula. I mean, that’s basically all the X-movies. 1. Character arrives, 2. stands in formation / checks out each other’s look, and then 3. “showing what they can do.”
For example, not male but Storm was an amazing character because of her personal journey. She has the potential film-wise to rival Logan. Comes to America after being worshipped as goddess. Gets humbled/tested in various ways. Gets REALLY humbled by losing powers. Proceeds to shave head, kick ass, and earn power as leader of X-men and underground mutants. Then develops an unhealthy relationship w/a Tom Selleck moustache. Put THAT on the big screen!