I know some of these have had episodes where they were bad (Vamp Xander & Buffy trying to feed her friends to a demon for example) but it wasn't really them going bad and was always resolved by the end of the episode, I'm talking full on villain like Dark Willow.

Add if your first choice isn't there but remember, no characters we already saw as villains so no Willow, Anya or Spike.

i would have LOOOOVED to see "Ripper" in hie complete bad ass evilly glory. XD <3

I'd say buffy, but close behind would be dawn/tara joint =]

Actually, I'm not sure I'd want to see this. The thought of it is actually very disturbing. But I think if Giles were to go dark, he'd go really dark. And despite his tweed, he'd be a formidable villain.

ok this would have been a complete character change and maybe i would have loved her character then, she was too fumbly and good, god she would have been the most interesting character to see go bad becasue she would have just been the complete opposite!

Giles would be a good villain, but I love him too much the way he is, maybe it would be interesting if the Key turned out to be evil somehow?

maybe then she would not have been so annoying.

i can sort of picture this actually. :) i sorta got my fill of evil buffy with faith/buffy and the first, even though those weren't actually buffy.

I wanted to see Buffy as very evil vampire. That would have been interesting.

Tara would also be interesting. Dawn's already evil.

It'd be really interesting to have the main character go dark and have everyone else have to try to save her.

I'd have liked to see more flashbacks/references to Giles' past as Ripper, but I don't think I'd want him to go back to Ripper mode in present time.