Iceman
Bobby Drake was introduced in X-Men, and like his love interest Rogue (who we’ll talk more about later), his adaptation was a lot different than his comic book counterpart. Mainly, his powers were never quite on the level they should’ve been, especially considering he’s an Omega-level mutant. For those unaware, that puts his abilities on the same level as Jean Grey, who Fox had no problem adapting.
Article source: https://www.cinemablend.com/news/2479486/6-x-men-the-fox-franchise-didnt-do-justice