LEGION

LEGION (David Haller) - New Mutants #25 (March 1985)

Illegitimate son of Professor X and Gabriel Haller. Became catatonic after a traumatic incident in which he was forced to kill an entire group of terrorists. Absorbed the personality of the leader of the terrorists. Suffers from identity dissociative disorder. Manifested initially three and later hundreds of distinct personalities. Omega Level mutant. Member of Muir Islanders and New Mutants. Travelled to the past and murdered his own father, thus unwittingly triggering the Age of Apocalypse dimension. Died after his powers were exhausted. Recently returned and has manifested hundreds of personalities, each with its own powers. One of them briefly warped the main Marvel Universe into the Age of X. Retained his powers post-M-Day.