Caliban

Director James Mangold explained that the reason the character Caliban is different in Logan than the version of the character that debuted in X-Men: Apocalypse is because neither film production knew the other was using the character. However, Mangold refused to change the character after X-Men: Apocalypse premiered, as he still wanted to tell his story the way he wanted instead of curtailing it to fit within the broader X-Men universe.