Gotta build a little wall here to protect myself.....
Oddly, Buffy and Angel don't SCREAM Champion to me. Why? Because they both kind of half heartedly and begrudgingly took the role of Champion and neither ever really seemed to get much joy or satisfaction from it. In fact, they BOTH seemed to be willing to run away from it if they could find a way to keep their loved ones safe in the process.
I guess I mean, I work about 12 hours a day. It's not always fun. Sometimes it's stressful. But, I ALWAYS love it. Now tell me I have to go be a secretary in an office 30 stories up in LA? I'd be a LOT closer to how Buffy and Angel took their roles in life a WHOLE lot more.
On the other hand, Willow, Xander, Cordy, Gunn, and Fred all jumped in with no super powers (at least to begin with) and were happy enough to do it, if not just to keep the ones they loved safe....but the world.
Giles and Wes, too, although they at least came better prepared. Even Groo, Oz and Tara...although with minimal "powers" jumped in a pile of goo WAY over their heads without thinking. And even Spike was willing to "Save The World" long before he felt the need to fight for it daily. And DID, even before the whole soul thing. Some, in part to keeping someone he loved safe, but when he thought she was dead, he still hung out and helped out the "crew" with nothing at all to gain but that warm, fuzzy "Good For You" feeling in his poor little unsouled, dead body.
Sometimes, I think even Faith was a bit more "Championy" if only for how she stepped up in Season 7. She got a little blind sided by the coupe too and kept going on as if everything was peachy.
I'll give them that it kind of stinks to have decisions thrust upon you. Being told you CAN'T do something makes it all that more attractive. And the rest of the cast really had a bit more of a choice whether to jump into this or not. Not a lot more of a choice, if I went to Sunnydale, I'd have been buddying up to Buffy too. But, they did have a tiny bit more of a choice.
I'm not sure, in the end, I really felt like either Buffy or Angel WERE Champions. I can live with them having the title, but I think the rest of the major cast deserve it more. I should probably add a special spot for Dawn and Connor, who shouldn't even EXIST. They really didn't ask to be thrust into all of this mess and they've stepped up many times when I wouldn't have blamed them for running the other way....and fast.