Hard for me to decide on favorite minor P&R character. Both Jean Ralphio and Perd Hapley crack me up every time they are on screen
Nedick from Saved by the Bell
I'd say Lil' Sebastian but he's a major character.
Those two top my list. I'll add Brandi Maxxx, the uptight censorship lady, Sewer Joe, the animal control guys, Joan Callamezzo, and The Douche.