I'm gonna have to go with lemmiwinks on this one. I mean, the gerbil king is the only person I know of to make it out of a gay man's ass...the other end.
Yeah, he's probably my favorite and an extremely underrated character. I'm glad they use him more often in the later seasons. I also like those two moron kids who randomly appear in episodes, the first of which is the Big Gay Al episode. They always appear briefly just to calling something or someone gay. "Stupid dog." "Yeah, stupid gay dog." Haha.
* Jimmy (pissing myself laughing the other night at Jimmy's rendition of "the 12 days of Christmas")
* Timmy
* Butters - That's me!
* Mr Slave - Oh Jezzuz Chraast!
* Kyle Schwartz:
There are a few more, but yeah, i can't pick a favourite