Joker (Earth-4678)

"Well, no masks for me. I have nothing to hide. I laugh at the cruel absurdity of the world. But Batman... Batman, he's got them all fooled. He's made them think he can make a difference. That he can actually make things better. And the joke of it is, they all believe it!"

- Joker

The Joker was a mastermind criminal and the arch nemesis of Batman. Conflicting, unconfirmed reports state that he was a failed comedian, a petty thief, and a broken family man under the guise of the Red Hood. He was an unrepentant homicidal maniac, albeit without a precise psychological diagnosis. His white skin, green hair, and blood-red lips belied the chaotic nature underlying his cartoon appearance. The self-styled "Clown Prince of Crime" had no superpowers beyond a capacity for incredible violence and a skill at creating deadly mayhem. He frequently concocted elaborate schemes to entrap Batman, before his death at Arkham City as a result of blood poisoning.

Source

 * https://dc.fandom.com/wiki/Joker_(Arkhamverse)