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quite a few i recall from years ago ;the puppet master,catwoman,joker,riddler.

Dr. Doom (the original comic book version, not the movie version) is the baddest motherfucker in comics.

Batman has a great rogues gallery too...especially when the more psycological aspects of their characters are explored.

Galactus was a cunt.....he'd devour whole planets.
Green Goblin was a nasty fucker as well. Marvel villains were so much evil than their DC counterparts.
Agreed Dr Doom was a bastard as well.