Charles Xavier created the X-Men for two reasons. One was teaching the young mutants how to use their powers safely. The second was to create a team that could act as heroes to facilitate the relationship between the mutants and the humans who fear them. However, there are several X-Men who have been anything but heroic in their lives.
The X-Men have always had to fight anti-mutant bigotry, and this has caused some of them to act like the villains they usually fight. Mutants have cheated, stolen, murdered, and violated all kinds of laws, things that they could normally do to take down evil mutants. At the end of the day, they are still heroes, but many members of the X-Men have been one step away from turning to the dark side.
Beast was, at one point, a lovable and enthusiastic founding member of the X-Men. However, it became darker as time went by. There was even a version of Beast from the alternate world, known as the Dark Beast, who carried out disturbing and unethical experiments, having turned completely evil.
The main Beast timeline is getting closer to that in Krakoa. He has committed many crimes and has simply told Professor X not to ask questions for which he does not want answers. The Beast has also become ruthless, sending mutants to their deaths and explaining his actions by saying that they can resurrect, ignoring the pain he is putting them through. There may not be a more immoral X-Men member in Krakoa right now.
Magneto started out as the arch nemesis of the X-Men alongside the Brotherhood of Evil Mutants, so it’s no wonder he’s done a lot of terrible things throughout his career. However, he has also joined the X-Men and been their leader on several occasions. In the 1980s, he took over the leadership role when Charles Xavier left Earth, but then went back to being a villain after that.
Currently, Magneto is a hero once again, serving on the Silent Council in Krakoa. He is one of the only people, besides Charles Xavier, who knows the secret behind the new mutant society. However, Magneto is also not above turning back the clock. He has betrayed almost every other mutant on the X-Men team and, in his most villainous moment, ripped the adamantium out of Wolverine’s skeleton.
Professor X is supposed to be the man who set the template for how all mutants should act. The problem is that Xavier has not always practiced what he preached. As the main leader of the X-Men, Charles Xavier has done more villainous things throughout his life than most of the X-Men put together.
He manipulates anyone’s mind, even completely rearranging Wolverine’s memories to force him to join the X-Men in the first place. He joined the Illuminati, who were responsible for pulling the strings behind the backs of all the heroes on Earth. He shut down Magneto’s brain once, unleashing the monster Onslaught on the world. Even now, as the leading man of Krakoa, he has manipulated the world into bowing to the whims of his country.
Emma Frost was another villain who later became a member of the X-Men. When she joined, it was because she realized that Charles Xavier’s ideals were correct, and she soon became a trusted ally. He even fell in love with Cyclops at one point, and the two took the X-Men to great heights.
However, while leading the X-Men, he did something unforgivable. He faked the death of Cyclops to send the mutants to war with the Inhumans. Her actions caused many mutants and Inhumans to nearly lose their lives, and she fled when both sides learned the truth.
When Wolverine joined the X-Men, he had just worked for a secret government agency in Canada, and prior to that, he was part of the Weapon X program in the United States. After Wolverine joined the X-Men, he did his best to become a hero and curb his violent streak.
However, Wolverine has crossed the line more than once. He killed his own son Daken when he learned that Daken was destined to do terrible things in the future. In “Age of Apocalypse,” one of the X-Men’s most destructive alternate timelines, Wolverine became the last evil dictator. In the “Old Man Logan” story, he killed every member of the X-Men.
Cyclops committed the greatest sin when he was a leader in the X-Men. He murdered his mentor and father figure, Professor Xavier. This happened in Avengers vs. X-Men and it happened because Cyclops and his teammates wanted to allow the Phoenix Force to return to Earth, with him and several teammates possessed by her.
When Professor X tried to end the war between the two teams, Cyclops assassinated him in cold blood. Cyclops then lost the Phoenix Force and went to prison, where he ended up as a martyr to disenfranchised mutants around the world.
Of all the members of the X-Men, the one who committed the most egregious atrocity was Jean Gray, the former Marvel Girl. Jean was a founding member of the team and was its heart and soul for many years. However, after a mission in space went awry, she returned to Earth with the Phoenix Force controlling her.
It was then that Jean committed the greatest sin. With the Dark Phoenix rising inside her and the Hellfire Club pushing her to the brink, Jean set out and destroyed an entire galaxy. Billions died in the attack, and Jean ended up giving his own life to atone for this evil act.
Angel was the only member of the X-Men who seemed less likely to become a villain. Not only was he an “angel” with large white wings that allowed him to fly, but he could hide the wings under a shirt and move on as if he were a non-mutant human. This changed after Angel was attacked and lost his wings.
In what readers thought Angel was taking his own life, his close friend Cameron Hodge betrayed him and blew up a helicopter he was in. Revelation brought him back as Archangel, and Angel changed his mind. More than once, Archangel murdered anti-mutant terrorists in cold blood, crossing a line the X-Men vowed never to approach.
Rogue began her career as a villain. Annoyed by Mystique and Destiny, she was a villain who fought the Avengers. In fact, she used her mutant abilities to strip Carol Danvers of her Captain Marvel powers and much of her memory, destroying the superhero’s life for many years.
After becoming a hero, Rogue changed and atoned for those sins. However, there was a time when he crossed the line. In a new team of X-Men and Avengers members, Rogue found herself teaming up with Scarlet Witch, who had previously stripped most of the mutants of their powers. At one point, Rogue mistakenly thought that the Scarlet Witch had betrayed them, and with no evidence to back it up, she murdered Wanda in cold blood.
Gambit did one of the most villainous things in X-Men history, and he didn’t even know he was doing it. Mister Sinister had created a group called Acolytes and forced Gambit to help him. Without knowing why, Gambit helped lead Sinister’s team into the tunnels beneath New York City.
This is the event that led to the Morlock Massacre. Gambit realized what he did and kept it from his teammates, including his lover, Rogue. When the X-Men found out that he was responsible, they banished him from the team.