Jonah Nicholson (Earth-18000)

Jonah Nicholson, better known as The Joker, is the arch-nemesis of Batman. He is a psychopathic criminal who has often been in Arkham Asylum.

Bio
Jonah Nicholson was born and raised in a poor neighborhood of Gotham City. His father left before he was born. His mother, who never remarried, struggled to raise him on her own. As a teenager, Jonah began committing crimes. He never finished high school and struggled to find a job. But he was able to provide for himself and his mother by selling drugs.

Eventually, Jonah killed his mother. The judge never ruled him as guilty, because the jury and lawyers had little evidence that he was.

By his mid twenties, Jonah had become a scheming and powerful criminal. He was the top drug dealer in Gotham. He paid off cops and had the best lawyers. He also became a pimp and used real estate as a cover for his criminal enterprise.

Death
At the age of thirty, Jonah was wounded during a fight between his men and some of Rupert Thorne's men. The scars he sustained during the fight resulted in a permanent grin on his face. When he was recovering in the hospital, he was shot and killed by a hitman.

Rebirth
Though Jonah Nicholson had died, his corpse was resurrected by a Lazarus Pit. Members of a mysterious secret society had retrieved his corpse from the morgue. Jonah woke up in an abandoned warehouse near the Lazarus Pit. But he was not the same man. He lost his sanity and all memory of his past. The Lazarus Pit's chemicals had dyed his hair green and bleached his skin white.

Shortly after this, the amnesiac went on a killing spree. The media, mobsters, and everyday people began referring to him as "The Joker."