The Joker is a fictional person.
Joker (character) . In his comic book appearances , the Joker is portrayed as a criminal mastermind . One of the most iconic characters in popular culture , the Joker has been listed among the greatest comic book villains and fictional characters ever created . The Joker is a fictional supervillain from American comic book publisher DC Comics and the main antagonist in Christopher Nolan 's 2008 superhero film The Dark Knight .