|Aliases||Clown Prince of Crime|
|Affiliation||Legion of Doom, Injustice League|
|Base of Operations||Arkham Asylum|
|Creators||Jerry Robinson, Bill Finger, Bob Kane|
The Joker is a psychotic mass-murderer who dresses as a clown, and commonly terrorizes Gotham City, thus becoming Batman's archenemy.
Joker's origins are shrouded in mystery, and all that is clearly known is that he fell into a chemical vat, taking the color out of his skin, and turning his hair green. Blaming Batman for this, as he had been trying to stop Joker's gang's robbery of Ace Chemicals at the time, Joker constantly tried to destroy Batman, though he had somewhat of a refusal to actually finish him off, because Batman is his only worthy opponent. Due to this, most of his attacks against Batman are personal, often against loved ones or other members of the Bat Family.
Jason Todd Edit
When Jason Todd had taken up the mantle of Robin, after Dick Grayson left the spot to become Nightwing, Joker kidnapped him in an attempt to get to Batman. After brutally beating Robin with a crowbar, Joker detonated the warehouse that he was held in, seemingly killing him.
Joker is still Batman's archenemy, and becomes one of the original members of the Legion of Doom, along with Red Skull, Black Manta, fellow Batman rogues Scarecrow and Riddler, Sinestro, Bizarro, Bullseye, Rhino, Loki and team leaders Doctor Doom and Lex Luthor.