The Joker's nemesis is BATMAN, a fictional superhero created by Bob Kane and Bill Finger in 1939. BATMAN is a vigilante who fights crime in Gotham City and is one of the most iconic characters in popular culture. He is known for his use of gadgets and martial arts skills to fight crime, as well as his moral code against killing. BATMAN is often seen as the antithesis of The Joker, a criminal mastermind and arch-nemesis of BATMAN.