User blog:KillRoy231/Big Bads of Angel

First, let me tell you how I got into Buffy the Vampire Slayer. I hadn't intended to watch it previously, I was checking to see if my theory about Joss Whedon sparing his ultimate/final antagonist was true, since we never even see the Alliance's leaders in Firefly and I assumed Alpha was the main villain (later found out he does kill the Big Bad of Dollhouse, but only after making us like him as a hero first). To prove my theory that Thanos will survive the end of Avengers 3.

Anyway, I was surprised to see a Joss Whedon series expand beyond two seasons. Out of seven Big Bads - The Master, Drusilla, Mayor Richard Wilkins, Adam, Glory, Warren, and The First, only two of them survive, including The First, who I'll say from his description is indeed the ultimate/final antagonist. Well, I couldn't really find much about his fate aside from his status listed as "eternal and omnipresent" while he wasn't listed on the body count of the final episode, so I'm assuming he survived the Hellmouth's destruction (unless it's another of those "most likely dead but audience believes they survived, like Ogron, Anagan, and Gantlos from an anime I know). But the more I read about it, the more it seemed my kind of show so I decided to try it out.

But anyway, I also realize there's a spinoff series, Angel. I'm currently over halfway through Season 3 of Buffy the Vampire Slayer (Faith just killed Allen), but I haven't been able to get a clear idea from wikipedia as to who the main villains of the seasons are. I have found articles on some villains like Lindsey McDonald, but none of them have used the terms "main villains" or "Big Bads" (aside from category pages), so can someone give me a clear idea of who the main villains of the show are? Main villains of each season?

Like, for Buffy: Or, if there's more than one, say so (like in 24, Logan is the main villain, Bierko is secondary villain since Logan leads the conspirators while Bierko leads the terrorists, and Graem is guy behind the guy because he seems to have highest position among the conspirators and Logan takes orders from him).
 * Season 1 - The Master
 * Season 2 - Drusilla
 * Season 3 - Mayor Richard Wilkins
 * Season 4 - Adam
 * Season 5 - Glory
 * Season 6 - Warren
 * Season 7 - The First

Or does the series not follow a "main villain" style like Buffy does?