Squilliam Fancyson is a secondary character in Spongebob Squarepants. He is villain of Squidward being fancier, richer, and even more handsome than Squidward. He is a squid who went to high-school with Squidward. Although he is possibly Squidward's biggest rival, he doesn't appear enough to be considered a main character with only 7 appearances with only 5 major appearances. His first appearance was in Band Geeks when he tells Squidward that he would have to do the Bubble Bowl with his band because Squilliam's couldn't make it. He faints when he sees Squidward's band, made up of Spongebob, Patrick Star, Sandy Cheeks, Eugene Krabs, Plankton, and most of the other citizens of Bikki Bottom plays beautifully. He returns in Squilliam Returns wanting to eat at Squidward's 5-Star restaurant that he doesn't have. He appears in several other episodes. He is voiced by Dee Bradley Baker.
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