| To do a proper spinoff series, you need a main character who can do the proverbial "kicking of the buttage" - i.e. have lots of cool fight scenes with people. That being said there are only 2 characters who fit the bill here - Faith and Spike.
Personally I'd love to see a Faith spinoff show, seeing as she's my favorite Buffy character.
A Spike show does have potential, but it could be perceived as a ripoff of Angel. I also find the Spike character too one-dimensional to carry his own show.
The best bet would be a Faith show.
On a side note, on Angel the best characters would either Conner or Wesley. |