Mr. Twiddle

Mr. Twiddle is a zookeeper who stars in the Wally Gator shorts. His voice was originated by Don Messick.

Harvey Birdman
In "SPF" he's sued by Ding-a-Ling for using a porn website with Ding-a-Ling's name in it.

Wacky Races (2017) cameo
In the episode "The Wacky Always Races Twice," he played the role of one of the "Low Lives" that Penelope Pitstop had to avoid.