So without further ado
Meeseeks and destroy.
It's gotta be Rick. He's my spirit animal.
Close Rick-counters of the Rick kind.
Not only is this episode hilarious, but it speaks to a longer story arc. By Rick's own admission he's got the Mortyest Morty. " A cocky Morty can lead to some big problems. It can be a real bad thing for everybody. "
Honestly, it'd probably be Fart or Squanchy. However, these parasitic bastards have us so many characters. It's cheating a lil bit but that's my answer and I'm sticking to it.
Other show to recommend:
I'm a fan of all shows mentioned in other cards. So....I'd go Invader Zim. fucking hilarious show. With an honorable mention going to the short lived Death Valley.