Joan the Vampire Slayer
Carpe Spuffy!
I'm sorry, but I thought Caleb was hilarious... Nathan Fillion played that role so well! I just got done rewatching S7 and I had forgotten about when he first appears and picks that Potential up on the side of the road... I cracked up laughing at this:
CALEB
Well, Shannon, you feel like telling me why those Freaky Joe's were after you?
SHANNON
I'm not sure.
CALEB
Well, do you ever think that maybe they were chasing you because you're a whore?
SHANNON
(looks at Caleb, scoffs) What?
LOL Yes, I know I'm warped....
I found him kind of scary, actually. Besides being a obvious parody on overtly "Christian" people (Joss never fails to "comment" on the damaging nature of Christianity in his shows) but Caleb also represents something sinister - he lures girls to him with the promise of saving them, only to kill them. He works for the First Evil, so he's obviously a wolf in sheeps clothing.
I do agree though that Nathan rocked that role.