Favorite Buffy/Angel Villains

[salnor]

Just thought I'd inquire about everyone's favorite Buffy and Angel villains to get a general idea of who everyone loves to hate in the Slayerverse.
Note: The First Evil doesn't really count as a villain to me since The First is evil itself.

My favorites from Buffy were Caleb, Adam, and Faith Lehane, while my favorites from Angel were Marcus Hamilton, Eve, and Lilah Morgan.

[Buffy8Fan]

My favorite villian for both shows will always be Angelus. I hope everyonew knows why.

[salnor]

Correction: Instead of Eve as one of my favorite Angel villains, that honor goes to Drusilla--who was on both Buffy and Angel, with a bigger role on Buffy. More on why I selected the villains I did later.

As for why Angelus, Buffy Fan, I'm guessing maybe because of his general Hannibal Lector-esque behavior and the fact that he's Angel's dark alter-ego?