Tammy 2 from Parks and Rec, Dr. Spaceman & Colleen Donaghy (Jack's mom) on 30 Rock, Barry Zuckercorn on Arrested Development, and pretty much any secondary character on It's Always Sunny on Philadelphia (favorites are Artemis and the McPoyles).
Edit: Also, anytime Jeffrey Combs showed up on DS9 it was a goddamn delight.
Zenitram_J t1_j1rzgtg wrote
Reply to Best secondary characters that show up from time to time? by SerDire
Tammy 2 from Parks and Rec, Dr. Spaceman & Colleen Donaghy (Jack's mom) on 30 Rock, Barry Zuckercorn on Arrested Development, and pretty much any secondary character on It's Always Sunny on Philadelphia (favorites are Artemis and the McPoyles).
Edit: Also, anytime Jeffrey Combs showed up on DS9 it was a goddamn delight.