Think back to X-Men: The Last Stand. The movie introduced two major parts of X-lore in the form of the Juggernaut and the Phoenix. In the comics, Juggernaut is powered by a demigod bent on destruction and his connection to everything X-Men comes from his relationship with his stepbrother Charles Xavier. Understandably, they didn’t want to delve too far into that for a supporting villain and made zero mention of any relationship with Xavier, all while explicitly showing that in this world, Juggernaut’s strength was based on the mutant gene.
As for Phoenix, despite being one of the most defining X-Men storylines, the force was revealed not to be a cosmic being from beyond the stars, but an overpowered and uncontrollable part of Jean Grey’s psyche. It is depicted as the worst-case scenario for someone having mutant abilities.
Even the super-science of the X-Men movies was almost explicitly about mutants. A psychic hub to track down mutants. A cure for mutant abilities. Shoving multiple mutant powers into a single human test subject. Time travel by using mutant mind powers. Robots programmed to exterminate mutants and counter their powers.
Gradually, they started to branch out. Wolverine fought a samurai mech. Deadpool showed that excessive physical abuse could awaken powers in non-mutants if done right. Cable used time travel in a way that wasn’t directly linked to a mutant’s abilities. In Logan, Donald Pierce is a cyborg. Even though X-Men: Apocalypse once again reveals the Phoenix as an extension of Jean’s psychic powers, Dark Phoenix goes against it by adding its cosmic origins and throwing in a bunch of aliens as the antagonists.
Who is Magik and what are her powers?
That brings us to New Mutants and the character of Illyana Rasputin, otherwise known as Magik. Unlike the other four main characters, Magik existed before New Mutants was a thing in the comics. Dating back to Colossus’ first appearance in 1975’s Giant-Size X-Men #1, Illyana was just a side character with the focus on her chrome-plated older brother. Being that she was only a little girl, they decided to dramatically age her up in order to make her a believable hero type.