Here is Willow's entry.
17. Willow Rosenberg
Sidekick to: Buffy Summers
The once-mousy No. 2 behind Buffy's hottie superhero, Willow (a nerd-cool pioneer) tempered the vampire slayer's quip-spouting, melodramatic ways with patience, reason, and a readiness to roam the nether regions of the demon world. Eventually, Willow developed her own superidentity — without ever upstaging her stake-wielding pal — by dating a werewolf, becoming a scary-good witch, and gracefully outing herself.
http://www.ew.com/ew/article/commentary/0,6115,1213444_7||233618|1_0_,00.html
I'd argue that in my mind she was no sidekick, but hey, at least Spike was not on the list at all.
These icluded real (Ed McMahon, Art Garfunkle) to made up (Robin, Barney Fife).
Warlock


she is sooo cute in these pic 

