One of season two’s trifecta of vampire villains, Drusilla was as mad as a bag of blood-sucking bats but she still retained some humanity through her passionate romance with Spike. Dru was such a big part of the mythos that she had guest spots all the way until Angel‘s final season.
Before Faith redeemed herself, she was a very bad girl. Without the moral compass of Buffy, Faith’s Slayer abilities led her into a path of villainy where she allied herself with the Mayor, in a bizarrely sweet father-daughter dynamic. She’s the best little bad the show ever had.
Likewise, prior to his turn to the good side, Spike was one of the baddest vamps out there – but he was still a lot of fun to watch. The great thing about Spike is that he always retains his core Spikeness – whether he is trying to end the world or save it, he’s one charismatic character.
Angel might be a brave “dark avenger” but his evil alter ego Angellus takes a perverse delight in torturing his enemies – both emotionally and physically. A true monster, it is always thrilling when Angel’s inner demon is let out to “play.”
“Can’t even shout. Can’t even cry. The Gentlemen are coming by.
Looking in windows, knocking on doors. They need to take seven and they might take yours.
Can’t call to mom. Can’t say a word. You’re gonna die screaming but you won’t be heard.”
I think that sums it up.