YellowSponge is SpongeBob

SpongeBob SquarePants (often referred to simply as SpongeBob) is an American animated television series, created by marine biologist and animator Stephen Hillenburg. Much of the series centers on the exploits and adventures of the title character and his various friends in the underwater city of "Bikini Bottom". The series' popularity has prompted the release of a media franchise, contributing to its position as Nickelodeon's highest rated show, the most distributed property of MTV Networks, and among Nicktoons' most watched shows. As of 2011, SpongeBob SquarePants is the only Nicktoon from the 1990s that has not ended yet. The show is listed 15th in IGN's top 100 animated series list. It is also known for being one of Nickelodeon's longest running TV shows.

SpongeBob SquarePants is an energetic and optimistic sea sponge (although his appearance more closely resembles a kitchen sponge) who lives in a pineapple under the sea with his pet snail, Gary, who meows like a cat. Although Gary only actually speaks in a few episodes, (mainly in "Sleepy Time" in SpongeBob's dream world, where Gary is portrayed as a librarian with an English accent) the characters have shown an ability to understand him. Living two houses down from SpongeBob is his best friend, Patrick Star, a dim-witted yet friendly pink seastar who lives under a rock. Even despite his "Mental Setbacks", Patrick still sees himself as intelligent. SpongeBob's next-door neighbor and co-worker is Squidward Tentacles, an arrogant and ill-tempered squid who lives in an Easter Island moai and dislikes his neighbors (especially SpongeBob) for their child-like behavior. He enjoys playing the clarinet and painting self-portraits, but hates his job working at the Krusty Krab.
Another close friend of SpongeBob's is Sandy Cheeks, a squirrel from Texas. Sandy is an expert at karate and lives in an underwater tree dome. When not inside her tree dome, she wears an astronaut-like suit because she cannot breathe underwater. SpongeBob and Squidward's employer is former officer cadet for the Bikini Bottom Navy force and war veteran Eugene Krabs, a miserly crab obsessed with money, who is the owner of the Krusty Krab restaurant. Mr. Krabs has a whale daughter, Pearl, who is a teenage cheerleader. The reason why Mr. Krabs' daughter is a whale is unknown. Mr. Krabs’ archenemy is Sheldon Plankton, a small green copepod who owns a low-rank fast-food restaurant called the Chum Bucket across the street from the Krusty Krab. Plankton spends most of his time planning to steal the recipe for Mr. Krabs's popular Krabby Patty burgers to obtain success (occasionally with the assistance of his computer wife, Karen), though his schemes always end in failure.