Claim: Mutants are featured in Legion.

Legion -LRB- David Charles Haller -RRB- is a fictional character appearing in American comic books published by Marvel Comics . He is the mutant son of Professor Charles Xavier and Gabrielle Haller . Legion takes the role of an antihero and has a severe mental illness including a form of dissociative identity disorder in which each of his alternate personas controls one of his many superpowers .   Legion stars in his own TV series of the same name where he is portrayed by Dan Stevens .