I suppose Raven doesn't actually develop, she just seems to be in the same place she was at in the beginning of the movie: On her own, not killing, helping other mutants. I suppose her relationships have progressed, so maybe that's something. The Hank thing doesn't make any sense at all, Hank doesn't follow Charles' lead in this movie, Charles' perceptions alter throughout the film, Hank's doesn't, it doesn't matter if he's a support figure, he's a main character, he should have a character arc, but he doesn't. Nothing changes for him. Same thing with Magneto. He's a main character. He should have an arc. The movie almost never really gets into the idea that Magneto should think that he's now been proven right at this point. That should have been what his character was about in this movie. Start him out doubting his beliefs, you could even parallel his journey with Charles', so once he learns about the future, bam, renewed sense of belief, and he progressively starts getting worse from that point. Charles' sister's comfort level isn't more important than the future.
What I was saying was the guilt for being "the controlling older brother", when really she's the one who should be feeling guilty for running off with the guy who crippled her brother. This movie focuses on the wrong guilt.