|Creator:||Unnamed lazy kid|
|First appearance:||"Room With a Fued"|
|Voiced by:||Jim Cummings|
Penut Butter is a laid back pink haired imaginary friend who sounds a bit like Gomer Pyle. Peanut Butter enjoys oom-pah music and dirty rooms full of junk and spiders, and that's what he gets when Mac, Bloo, Wilt, Eduardo, and Coco try to move him out of the best room in the house by sabotaging it.
- He is similar to Fuzzy Lumpkins from The Powerpuff Girls, because of his two front upper teeth sticking out of his mouth, his antennae, pink hair, Southern accent, and nose.
- Despite being adopted in Room with a Feud, he makes a cameo at Foster's in the final episode Goodbye to Bloo.
- He is voiced by Jim Cummings who voiced Winnie the Pooh, Tigger, and Pete from Disney.