Mystique's and Beast's problem
I watched some of this movie the other night and sorry if I've missed something in the film/films, but why are they so bothered about the way their true selves look, when they have the ability to look human anyway? Does it take a particularly concerted effort to remain their human selves? Can they only remain human for a limited time? Otherwise who cares that your real self is blue.
I mean Mystique for instance. What is stopping her just being her human self permanently?