I really don't think that any of the main Buffy characters could support their own show. I mean, it's simply that they aren't strong enough characters. Perhaps Giles could, if he had another strong character to back him up, but by himself, I think not. Willow couldn't support her own show, she'd get killed the first episode, not being able to use strong magics. Xander is definitely not strong enough to support a show of his own. I mean, after seven years of a sorry-fighting goofball, I don't think an audience would buy him turning into a fighter like Wesley. Besides, Brendon (sp?) has already said that he's finished with the character. I don't think that Eliza Dushku could or should reprise her role as Faith. I certainly hope that no one flays me for saying this, but I think she gave to worse performance in Buffy/Angel history as Faith. I mean, she's absolutely wonderful in Tru Calling, but in Buffy she was awful! I'm just really sad that Tru Calling hasn't gotten better ratings, because it really is a good show. Now, as far as spin-off's of Angel go, Spike is your best bet. Either Spike or Wesley. They're both, in my opinion, strong enough characters to pilot their own shows. Gunn probably could support his own show, but I'd put him in a backup role on the Wesley show. All in all, out of all the characters in the Buffyverse, I'd give Spike the best odds for successfully piloting a spin-off.