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Squidward Tentacles is one of the main characters in SpongeBob Squarepants. He makes a few appearances in the SMG4 series.
He first appeared in R64: Mario's Spageti Delivary as a hallucination.
He is among the many dead contestants in ♫ The Ultimate Smash Bros ♫.
He was a music teacher in Mario's EXTRAS: High School Mario.
Handsome Squidward made an appearance in SMG4: Mario Saves Anime.