Evil Twin (concept)

An Evil Twin is a popular concept and stock character found in almost all media imaginable, before that the concept could be found in fairy tales, folklore and even some religious works - though like many archetypes the use of "Evil Twins" has been criticized by some who see it as an overused topic, despite this it remains one of the most popular concepts in fiction.

Despite the name not all Evil Twins have to be literal twins, in fact most are not related to the main character (or are "corrupted" versions of the main character, sometimes from a "Mirror Universe").