this poll does seem kind of random since a lot of these characters I love a lot and others I never ever cared for at all. So if you pit two I dislike, like Connor and Dawn, then my choice is even more meaningless than when you compare two I adore like Giles and Wesley.
How about a rating of best to worst:
Giles
Willow
Buffy
Spike
Wesley
Jonathan
Anya
Faith
Andrew
Gunn
Dawn
Connor
Angel
Cordelia
Warren
Riley
who did I leave out? LOL

I'm fascinated by Mark's love of Cordelia and I'm looking forward to his seeing Ats S4 when Cordelia gets really icky.