The Joker is a fictional character, a comic book supervillain published by DC Comics. He is an archenemy of Batman. Created by Jerry Robinson, Bill Finger, and Bob Kane. The Joker first appeared in Batman #1 (Spring 1940).
Throughout his comic book appearances, the Joker is portrayed as a master criminal whose characterization has varied from that of a violent psychopath to a goofy trickster-thief. He is the archenemy of Batman, having been directly responsible for numerous tragedies in Batman's life, including the paralysis of Barbara Gordon and the death of Jason Todd, the second Robin.
Throughout the character's long history, there have been several different origin tales; they most commonly depict him as falling into a vat of chemical waste, which bleaches his skin and turns his hair green and his lips bright red, giving him the appearance of a clown.
Joker was played by Cesar Romero, Jack Nicholson, Heath Ledger, Jared Leto and Joaquin Phoenix in movies. On animated shows/movies he is portrayed by Mark Hamill, Kevin Michael Richardson, Larry Storch, Jeff Bennett, and John DiMaggio.