I'm genuinely surprised at the lack of Zod love. That said... Two-Face. For someone who makes a point of having precisely two sides, he's surprisingly versatile!

Black Adam isn’t really a villain anymore…. But Black Manta is my favorite out of the people on this list

Atrocitus’ motivations are dynamic, so I find his character interesting. His ideals simply differ from the “Boy Scout” model that vengeance isn’t necessarily justice; in fact, he believes the opposite. And it’s while keeping that thesis that he leads his Corps. He’s a gray-area character who ends up in opposition of our cleaner-cut heroes in space.