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SpongeBob SquarePants is a cartoon character and the main protagonist of the hit Nickelodeon show named after him. In SMG4, he makes cameos in a few videos.
In Nickelodeon canon, SpongeBob is confident and optimistic, but also naive sea sponge, he loves his job at the Krusty Krab and acts kind yet rather obnoxious to others, but is helpful and kind to everyone in need, ever if they are aggressive and are sometimes annoyed by him.
In SMG4, SpongeBob is shown to be a psychopath as seen in SMG4: A Day In The Life Of Everyone, where he murders Patrick Star in a video. In that same video, Axol creates a replica of him with Steve Harvey's face. This replica appears in a flashback in SMG4: The Demon Among Us.
SMG4: Mario's Magical TV features "SpongeBob SquarePants Corrupted", which is a segment involving SpongeBob and friends in a messed-up version of Bikini Bottom acting incredibly odd.