Some mutants don’t look too good when their powers kick in. Chamber lost half his face.
Marvel’s one man army may or may not be a mutant depending on which comic you’re reading.
Sometimes Marvel just reuses names.
I am a huge James Bond fan even if I don’t love every James Bond movie. Casino Royale was amazing and then Quantum of
The Marvel Crossover House of M posited a world where the Scarlett Witch, temporarily insane, would first change the planet to one where mutants