The Alter-Egos of characters who take on a different role when in pursuit of their more amoral hobbies, often so they can commit crimes without fear of ruining their personal lives or acting as a "bad person" while also having a completely "normal" life when not in costume or out of character.

Often these are confused with Dissociative characters, but unlike them not all characters who have disguises or "act" in the role of a villain are Mentally Ill - indeed, many are perfectly sane and create such personas for very reasonable (if nefarious) means.