MX is a particularly ruthless and demented entity who will go to any length to claim as many souls as possible in order to integrate them into the game and make them his playmates for all eternity. Having existed since the beginning of time, all of his pent-up murderous sadism has been waiting billions of years to be unleashed on unsuspecting humans for his own amusement. MX's true form has no eyes. MX haunts a copy of Super Mario Bros.

He has two victims: Lucas Everett, and Tabitha Duffy.