Thread:Undoniel/@comment-27352854-20151214021645/@comment-5270921-20151221163938

Fantomex's apparent mutant status was engineered by writer Simon Spurrier. I really don't know why he did this. He started it back in X-Men: Legacy Vol 2 when he had the gestalt form of Legion absorb all mutants on the planet which showed Fantomex among them (and also Puck). It was addressed as an artistic mistake but when Spurrier became the writer of X-Force Vol 4 he further implemented the idea of Fantomex being a mutant.