Squidward
Squidward is passionate about reading, art, and music, and is especially fond of playing the clarinet, though no one considers his music or artwork to be noteworthy. His arch-rival is a wealthy octopus named Squilliam Fancyson.
Spongebob
SpongeBob is a childish and joyful sea sponge who lives in a pineapple with his pet snail Gary in the underwater city of Bikini Bottom. He attends Mrs. Puff's Boating School, and his greatest dream in life is to receive his boating license.
Mr. Krabs
Mr. Krabs is the owner of the fast-food restaurant, the Krusty Krab. He spends all his time there, if only to make sure his employees are working hard to make him heaps of money. For Mr. Krabs, the world exists so he can have money.