Okay, well, here’s my WAG, and it’s way out in left field, but when I heard the new principal introduce himself as “Robin Wood,” I thought, at first, he said “Robin Hood.” I immediately realized that that was dumb, and he said “Wood,” but it got me to thinking about his name, and “Robin Wood” sounds, at least to me, a lot like “Robin Goodfellow,” or, uh, the Puck. Having the Puck as a baddie (I’m not convinced that we’ve seen the Big Bad yet, since season one, which was only half a season anyway, was the only one in which the Big Bad was introduced in the first episode) would explain the shape-shifting, I-don’t-care-about-good-or-evil-just-power thing. So yeah, I know that’s way outta nowhere, but it’s my guess. That would also explain the succession of characters, because principal Wood has seemingly done good research on Sunnydale and would know which characters had the biggest influence on Sunnydale.
One thing I didn’t get about the end, though, was why each of the images of the baddies spoke in the style of the real baddies themselves. That is, the doppelganger of Glory was talking about a human word that would be fabulous enough for what she was, Mayor Willikins talked about selling his soul, and the Dru told Spike that they’d be together always, or something. So it was almost like it wasn’t one entity using these different faces, it was all these people coming back to torment Spike.
Come to think of it, that last suggests that perhaps these were figments of Spike’s tormented soul. Granted, he never knew the Mayor, but I’m positive the Scoobies would have spoken about him repeatedly. I mean, otherwise, any time they talked about, say, the last two principals being eaten, he’d’ve been all “huh?” The only one that didn’t really make sense, in the hallucination context, was Warren, because, to Spike, he wasn’t really evil. He was just some dork who helped him with science-y things every once in a while. So I dunno.
As for the idea that this means that Buffy will be this season’s Big Bad, did anyone else notice that the succesion of forms went backwards? Started with Warren, ended with the Master, then came Buffy? So I was just floored when that happened…