Uncle Cletus is the uncle of Bea, brother of Mr. and Mrs. Goldfishberg, husband of Aunt Emma, the father of Percy, Marshall and Woody, an owner of two dogfishes, a pug named, Sid and a Rottweiler named Rocket and a good friend of Oscar and Milo. He is voiced by Jack McBrayer.
He looks just like his brother and his hair looks like the same color. He also has a green and orange cap with a bulldog in the middle.
- He has a happy go lucky personality, love of apartment living and sports, a fan of happy country music with banjos.
- He lives in the big green building on the second floor, without a "No Pets Allowed" policy Room 12 with living room, kitchen, the boys' bathroom, Cletus and Emma's bathroom, Percy, Marshall and Woody's room, Cletus and Emma's bedroom, playroom, and the dog bowls in the kitchen that belonged to Sid and Rocket. And there are 3 flower pots so Emma will take care of them.
- Cletus and his family lives in Fish Montana.
- He can't eat radishes because it gives him gas.
- Cletus's family cannot buy an RV because it's so expensive for them.
Cletus is voiced by Jack McBrayer, also voices Wander from Wander over Yonder, Fix-It Felix, Jr. from the movie Wreck-it Ralph, Irving Du Bois from the show Phineas and Ferb, and had the Carnival Barker and the Tourist Father in Despicable Me.