The Joker sometimes works with other Gotham City supervillains, such as the Penguin and Two-Face, and groups like the Injustice Gang and Injustice League, but these relationships often collapse due to the Joker's desire for unbridled chaos. The Joker possesses no superhuman abilities, instead using his expertise in chemical engineering to develop poisonous or lethal concoctions and thematic weaponry, including razor-tipped playing cards, deadly joy buzzers, and acid-spraying lapel flowers. The antithesis of Batman in personality and appearance, the Joker is considered by critics to be his perfect adversary. The most common story involves his falling into a tank of chemical waste that bleaches his skin white and turns his hair green and lips bright red the resulting disfigurement drives him insane. The Joker has had various possible origin stories during his decades of appearances. As Batman's nemesis, the Joker has been part of the superhero's defining stories, including the murder of Jason Todd-the second Robin and Batman's ward-and the paralysis of one of Batman's allies, Barbara Gordon. Introduced as a psychopath with a warped, sadistic sense of humor, the character became a mostly harmless, comical prankster in the late 1950s in response to regulation by the Comics Code Authority, before returning to his darker roots during the early 1970s (although some of his more comedic characterization was kept for many incarnations of the character). In his comic book appearances, the Joker is portrayed as a criminal mastermind.

Although the Joker was planned to be killed off during his initial appearance, he was spared by editorial intervention, allowing the character to endure as the archenemy of the superhero Batman.

Credit for the Joker's creation is disputed Kane and Robinson claimed responsibility for the Joker's design while acknowledging Finger's writing contribution. The character was created by Bill Finger, Bob Kane, and Jerry Robinson, and first appeared in the debut issue of the comic book Batman on April 25, 1940. The Joker is a supervillain appearing in American comic books published by DC Comics.

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