i don't mean it in a "he's the most evil" way, i mean it in "he's the best written humanized villain ever", for me like johan liebert, griffith, and sousuke aizen are who i deem as well written and smart villains on thr top of my head. well written for me is when they catch you off guard and are unpredictable and smart that you can't help but love the way they execute their plans perfectly, it'd be such a bonus too when they're a foil character to the main protagonist, i would love to hear other people's opinions and eventually get a few recs in to add to my list! thanks!