Re: Which X-Man has received the least development in the films?
At least with Cyclops, they explored his relationship with Jean Grey a bit. Colossus never had a real story-arc in the movies.
X-MEN RI5E' MUTANT OF THE MONTH | PROFESSOR X | PORTRAYED BY PATRICK STEWART
"Every few hundred millenia evolution leaps forward." - X1
"Sharing the world has never been humanity's defining attribute." - X2
"Will you control that power or let it control you?" - X3
"Is the future truly set?" - X4