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The Joker
Real name Jack Napier
Debut Batman #1 (June 1940)
Created by Jerry Robinson, Bill Finger, Bob Kane
Affiliations Injustice League
Abilities chemist, gadgets
Played by Jack Nicholson, Mark Hamill, Heath Ledger, others

The Joker is a supervillain widely considered to be Batman's archenemy. The Joker is a master criminal with a clown-like appearance,and a violent sociopath who murders people for his own amusement, a vicious, calculating and psychopathic killer. He was described as a homicidal maniac by Batman, and was admitted into Arkham Asylum many times. He was Batman's deadliest enemy and a constant and dangerous one of the Justice League, also being one of the founders of the Injustice League.

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