Based on a yellow sponge. Gender is male. He is energetic and kind but a troublemaker. He can stretch or shape his body into any form he desires. He wears a red tie, brown shorts, and a white shirt. He is a huge troublemaker with Patrick, and they are very close. He annoys Squidward (which is why Squidward dislikes him). He keeps a pet named Gary. He absolutely loves Mondays.

Based on a snail. Gender is presumed male. He is smart, kind, and cute. He is SpongeBob's pet snail. He is well-behaved.

Based on a squirrel. Gender is female. She is calm, extremely smart, incredibly strong, kind, and gentle. She is a land creature (squirrel). Because of this, she cannot breathe underwater, so she lives in a polyurethane dome house and wears a diving suit with a glass helmet featuring a pink flower when outside.

Based on a crab. Male. He is obsessed with money, but he can be kind and warm at times. He is the owner and manager of the Krusty Krab / Burger Heaven, the best fast-food restaurant in Bikini Bottom. However, in reality, he is just a money-crazed employer who constantly overworks his employees, SpongeBob and Squidward.

Based on a starfish. Gender is male. He is energetic and dim-witted. He lives under a hemispherical rock. He is SpongeBob's friend and loves catching jellyfish.

Based on an octopus. Gender is male. He is irritable and prickly, but can be warm and kind (except to SpongeBob and Patrick). If you think about it, Squidward finds SpongeBob annoying but actually considers him precious and cares for him. One of the sub-protagonists of the SpongeBob SquarePants animation and the representative 'pitiful' character of the series. He lives a life of constant frustration because of the three idiots (SpongeBob, Patrick, Mr. Krabs).

Based on a whale. Gender is female. She is energetic and kind. She is stubborn but gentle and very, very cute (in the creator's opinion). She has blonde hair tied up and wears a pink dress. She is Mr. Krabs' daughter.

Based on a copepod. Gender is male. He is prickly and active (maybe?). He has an incredibly small body along with antennae similar to an arthropod's and a single eye. He is on very, very bad terms with Mr. Krabs. His place is right in front of the Krusty Krab, and they fight frequently. It's practically a war.

Based on a pufferfish. Gender is female. She is energetic and kind, but gets stressed and prickly because of SpongeBob. She is the instructor at the boating school SpongeBob attends.

Based on an AI computer / monitor. Gender is female. She is smart and cool-headed. She is Plankton's wife. She has a black screen. Her body consists of a mechanical frame with robotic arms and wheels. She can transform into various mechanical bodies depending on the situation. She is best friends with Pearl and Mrs. Puff. She is very knowledgeable about calculations and information.