Fuzzy Acorns is a karate instructor who only appeared in the episode "The Way of the Sponge." He is Sandy's instructor and known as "The World's Meanest Karate Instructor," according to SpongeBob. Later, he is amazed by SpongeBob's moves in the Krusty Krab. It was also shown that he has trained himself to breathe hours without air. Fuzzy is the owner of the "Blacker Belt" but later gave it to Sandy. Near the end of the episode, he loses his air and puts on an air helmet.
He is a faded brown land creature with light gray hair tied into two ponytails and wears a white karategi (karate uniform) with a black belt. He has a sheered tail with faded red hair and large, dark gray eyebrows. He wears a red-orange headband and his eyes are not visible. His appearance is similar to Master Udon.