The Joker. He is Batman's greatest enemy, he is the Ying to Batman's Yang. Batman is all serious, dark, and depressing whereas the Joker is the opposite. He is Happy, Gleaming, and Joyful. I personally believe that if their was no Batman, there would be no Joker and Vise Versa. They complete each other.
One that people may not say is Batman's Past. The darkness that haunts him is one of his worst enemy, and quite possibly his worst nightmare.
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