Characters who take a disguise when in their villainous pursuits, often so they can commit crime without fear of ruining their personal lives or act the "bad guy" while also having a completely "normal" life when not in costume.

Often these characters are confused with Dissociative characters but unlike a Dissociative not all characters who wear a costume or "act" the role of a villain are mentally ill - indeed, many are perfectly sane and create such personas for very reasonable (if nefarious) means.