Ethan Rayne is a human sorcerer who was Giles' evil buddy back in Giles college days. Giles was known as "Ripper" then ...
He showed up several times that I can think of in Buffy, variously inflicting evil Halloween costumes on Buffy and the Scoobies (turning Buffy into a damsel in distress, Willow into a ghost, and Xander into a soldier); turned Giles into a demon; was involved in some nasty scheme that got Giles' girlfriend -- the gypsy lady -- possessed. Few other eps, I think.
Buffy finally let the evil secret government soldiers have him.
I'd like to hit Clark and Bill with some more magical whammies -- so I figured Ethan would be a good villain.
