Chirrut/Jean
In my world, mutants are those of us who are born with a special gene that has evolved over time, or mutated. It generally results in us having some type of ability, which can occasionally manifest itself in a physical manner. My own abilities are related to my mind. They manifested when I was ten years old, during a traumatic experience, and resulted in telepathy and telekinesis, originally. The short version is that they've evolved over time as well, as I've learned, and they were...enhanced when I drew the attention of a cosmic entity.