An antihero is a main character in a story who does not act like a hero. Examples of antiheroes are Marvel Comics The Punisher & Deadpool , Sega's "Shadow The Hedgehog", Batman, Catwoman of Batman, Sweeney Todd and Martha-Scott Benson Most of the time it means a character in fiction, television, or movies. Sometimes it is used to mean a living person or person from history.
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Antihero Facts for Kids. Kiddle Encyclopedia.