Harvey - Two Face check, he's got a split personality, hates corruption, got serious revenge issues....lots of stuff there an audience can read into. Ares, a Wonder Woman enemy with thousands of years of ancient stories and folklore to back him up. Loki a Marvel character based on another ancient character of the same name with years of stories and years of folklore. Ra's AlGhul head of a cult that traveled from the Arabian peninsula to China, has lived hundreds of years and raised immoral/decadent cities to the ground leaving them burnt out. Red Skull a Nazi survivor of WW2 obsessed with the occult and desires to remake the world as he wants it. Joker one of the coolest interesting villains of all time. Magneto, another brilliant enemy, not even sure if he's really evil.
Bane, audiences just won't get him