In my opinion, the Joker, and it doesn't come close. Like, most of the villains in Batman, they're pretty interesting in their own way, they're all cool, I'm not even gonna lie to you, they're all really cool. But Joker just has more of an impact than Lex Luthor does to Superman, you know? Even to the Joker, the Joker has done more shit than him, but even then Lex Luthor is kind of like, lame in my opinion.