Joker (Earth-3064)

"This is what happens when an unstoppable force meets an immovable object. You are truly incorruptible, aren’t you? Huh? You won't kill me out of some misplaced sense of self-righteousness. And I won’t kill you because...you’re just too much fun. I think you and I are destined to do this forever."

- - The Joker

The Joker was a psychotic criminal and terrorist, who, by his actions and megalomaniac behavior, ended being Batman's greatest enemy. Formerly a desperate petty criminal only known as the Red Hood, he felt on a vat of acid while trying to escape from Batman in ACE Chemicals, which resulted in his skin turning white, his hair and eyes green and lips red. The Joker was born, and so was his bizarre, dependant relationship with the Batman, whom he would never dare to kill despite all the suffering he causes to him. Joker's manipulations even led him to create a possessive follower in the form of Harley Quinn.