Puffy Fluffy

Puffy Fluffy is a SpongeBob Squarepants character that only appears in "A Pal for Gary". He is a nudibranch (although not resembling an actual nudibranch at all).

SpongeBob bought him so that Gary wouldn't be lonely while he was at work, but he turned out to be a monster, but SpongeBob never notices and blamed Gary for the desruction of his house caused by Puffy Fluffy and also blamed Gary for chasing Puffy Fluffy even though Gary ended up saving his life.

Trivia

 * Nudibranches, Puffy Fluffy's species, are actually sea slugs.