I actually have a list of all the villains from 가장 좋아하는 to least favorite. I'll give my 상단, 맨 위로 5:
The 상단, 맨 위로 spot goes to Yzma for being extremely fun, casual, subverting many villain cliches, and for doing her own dirty work alongside her underling. Just a hair below her is Ursula for being so devious, actually valuing her minions, and for just being so shiveringly sultry.
다음 is Frollo for being SO dramatically self-righteous and chillingly realistic. Rourke wins 다음 for being just so cold and real it's amazing.
Lastly, I bring up Hades, for being wonderfully kooky yet dark, and for his great energy.