The X-Men roster is huge and always expanding, meaning there is a massive number of Marvel mutants missing from the X-Men films. The X-Men first hit pages in 1963, and ever since their first big team shakeup with Giant-Size X-Men #1 in 1975, their roster has been in a state of near-constant flux. Part of this is due to the fact that the X-Men are based out of a school, so they have a constant stream of new students to bring in and train before eventually graduating to the main team themselves.
The films can't be blamed for not using all the mutants since there's only somewhere around 20 hours of screen time to go around and hundreds of powerful mutants that all have their own fans. Naturally, though, with some characters getting sidelined in cameos, not appearing at all, or being altered to fit into the films' world, plenty of the beloved mutants have been done dirty.
- 12,302 VOTESPhoto: X-Men: First Class / 20th Century Fox
Darwin is an incredibly powerful character whose potential is wasted in X-Men: First Class just to give the big bad a chance to show off his strength. Darwin's mutant ability is that he can adapt to survive. However, he's taken out almost immediately by Sebastian Shaw after Shaw forces him to swallow a ball of energy, telling him to "adapt to this." The thing is, Darwin's abilities mean that he absolutely should have been able to adapt to it!
In the comics, Darwin survives "death" in several different ways. In one instance, he becomes pure energy that's absorbed into another mutant until a later time when he can become regenerated. In another, while fighting with the Hulk, his body decides the best course of action would be to get the heck away from the Hulk, and he's teleported away from any danger. His entire deal is that he adapts to survive in a number of interesting and unpredictable ways.
- Photo: X-Men Origins: Wolverine / 20th Century Fox
Gambit is the favorite mutant of many an X-Men fan, yet he barely appears in the films at all. The only movie to feature the Cajun mutant is the almost universally disliked X-Men Origins: Wolverine. That's no way to introduce an all-time great mutant character. In the film, he's a member of a government strike team, working alongside Wolverine and Ryan Reynold's Wade Wilson. While he's not quite the character audiences know and love, at least it gave fans a chance to see Gambit blow up some playing cards on the big screen.
Gambit is a relatively new member of the X-Men, making his comics debut in 1990 and quickly earning more attention as a core member of the animated X-Men team that debuted in 1992. He's a trained thief who helped out Storm after she was turned into a child and became a pickpocket herself. This connection led Gambit to his position on the X-Men team, where he fell in love with and eventually married Rogue.
- Photo: X-Men: The Last Stand / 20th Century Fox
Juggernaut's first film appearance came in X-Men: The Last Stand, where he is portrayed as a lackey who joins up with the Brotherhood of Mutants after Magneto breaks him out of prison. While his power set in the film is impressive, and he has an entertaining scene smashing through a hospital in pursuit of Kitty Pride, both his physical appearance and storyline leave something to be desired.
In the comics, Cain Marko is the brother-in-law of Charles Xavier, who is transformed into the hulking behemoth known as the Juggernaut after finding a ruby "empowered by the demonic entity Cyttorak." Juggernaut is one of the comic book's longest-running and most recognizable villains, with his first appearance dating back to 1965. In the comics, he is normally drawn to be roughly in the weight class of Hulk or the Thing, not just the size of a bodybuilder. Luckily for fans, Deadpool 2 treated audiences to a new incarnation of Juggernaut, in which the character is his proper hulking size and is able to rip Deadpool in half with his bare hands.
- 41,458 VOTESPhoto: X2 / 20th Century Fox
Nightcrawler is one of the most striking mutants in Marvel history, yet the original X-Men films seemed to be unable to make time for him. He makes a promising debut in X2's opening scene as he attempts to slay the president in a brainwashed state. He's soon recruited by the X-Men to join their ranks, but doesn't contribute much after that. He gets to use his teleportation powers to help Storm into Stryker's bootleg Cerebro and save the day, but he's clearly on the fringes of the "real" X-Men. On top of that, he is completely left out of X-Men: The Last Stand.
In the comics, Nightcrawler has been a member of the team ever since their soft reboot in Giant-Size X-Men #1. That book saw the end of the original X-Men status quo and ushered in the team fans now know and love featuring Wolverine, Colossus, and Storm. Ever since Nightcrawler joined the X-men's ranks in 1975, he's never been far from the team.