20. Mr. Krabs's arch-rival "Sheldon" Plankton is a little microbe with a big attitude problem. Owner of the rival restaurant, The Chum Bucket, Plankton's only objective in life is to steal Krabs's secret Krabby Patty recipe. Then he can steal away The Krusty Krabs's customers as well. Plankton knows nothing about preparing food and as a result The Chum Bucket's menu (consisting mostly of chum products) is horrible. Plankton rarely has a customer, but he's a nasty little fellow who never gives up. Plankton's companion is his computer wife: K.A.R.E.N. Karen tries to assist Plankton in his dastardly schemes to get the secret formula, but Plankton's ego never allows him to succeed. It kind of makes you feel sorry for the little guy.

22. Krabs is the penny-pinching owner of The Krusty Krab, a fast food restaurant in Bikini Bottom that employs SpongeBob and Squidward Tentacles. In contrast to his namesake, Krabs is something of a miser. However, he is not heartless—he cares about SpongeBob SquarePants (who keeps his restaurant afloat), dotes on his daughter Pearl Krabs, and in one episode, he found his second love (after money) in Mrs. Puff. Mr. Krabs' arch-rival is Sheldon J. Plankton, the owner of rival restaurant The Chum Bucket across the street from his establishment. He has a mother, Momma Krabs, who lives in a near identical version of his anchor home, except it is pink. Krabs' birthday, revealed on his driver's license in the episode "Sleepy Time", is November 30, 1942. He also served in the Navy, where he earned the nickname "Armor Abs Krabs"

23. Gary is an intelligent, fully domesticated, sea snail born in Bikini Bottom. His intelligence shines through in the fact that he generally has much smarter solutions to SpongeBob's dilemmas than SpongeBob does. Gary tends to disagree with some of SpongeBob's ideas, and usually makes an effort to warn SpongeBob. Some of Gary's meows are lower pitched, some are higher pitched; these could possibly indicate that Gary uses different tones of his voice to communicate with SpongeBob Square Pants. Gary loves pretending to be Squidward, playing music, reading books, and eating Snail- Po Snail Food, among many other activities. He especially enjoys famous literature such as selected works by Emily Dickinson, and is an accomplished snail-poet himself. He has his own bed, exercise wheel, and water and food bowls, and expects his food bowl to always be full.

24. Pearl is a huge teenage whale. She goes to the mall very often with her friends. She’s always talking to them, but she can also get very annoyed while on the phone. There is also a rare chance of Pearl breaking through her bedroom floor. Mr. Krabs tends to gives her horrible birthdays except for the previous sixteenth. Pearl also loves flipper slippers. An interesting fact is she does not eat plankton.

26. Sandy is a very talented and athletic squirrel born in the state of Texas on May 21, 1984, who moved to Bikini Bottom in the South Pacific Ocean underneath Bikini Atoll, for as yet unrevealed reasons. She lives in an air- filled habitat structure called the "Treedome" (a plexiglass dome containing a tree, living quarters and various other land plants). When outside of the Treedome, Sandy wears an air-filled diving outfit that looks much like an astronaut's suit; while in her Treedome, she wears a purple bikini with a purple skirt- like ring around her middle and with green underneath. Physically, Sandy is one of the strongest creatures (along with Larry Lobster) in Bikini Bottom. She claims to be stronger than Larry, and the strongest one in Bikini Bottom and she can even pull down gigantic ships and boats from the surface of the ocean as seen in Sandy, Spongebob and the Worm. plexiglass domeplexiglass dome

28. SpongeBob Square Pants and Patrick always encourage Squidward to participate in their games, but this only annoys him. In particular, SpongeBob Square Pants and Patrick often ask him to go jellyfishing with them. While seemingly the eternal pessimist, he occasionally tries to be like SpongeBob Square Pants (often with hopes that doing so will stop SpongeBob Square Pants from bugging him), but does not ever get the hang of it. In one episode, however he finds himself putting a piece of paper on his nose and dancing a jig in insanity. When SpongeBob Square Pants isn't looking, Squidward will start to act more like SpongeBob Square Pants from time to time, especially in the earlier episodes like Bubble stand and The Paper. Squidward's voice reveals a lot about his persona and attitude, much like SpongeBob's voice. In one episode, Selling Out, he is forced to keep a smile glued to his face by the manager of Krabby O' Mondays which creates an interesting effect, as Squidward hardly ever smiles while showing his teeth.

30. Jelly fish fields

33. SpongeBob Square Pants is very trusting, generous, friendly and very sweet. He has a buck-toothed grin, tremendously expressive face and square body that complement his pure and good nature. SpongeBob Square Pants will rarely knowingly do wrong or harm to anyone and never without remorse. However, he has been known to shout and curse (even "obscenities") when angry or frustrated. He dislikes scary things and stinky things. Although he is an adult, he has a very childish nature. Although a good-natured and loving sponge, many characters seem to avoid him. SpongeBob Square Pants is very easily overexcited about almost everything, like many different or simple/regular tasks, or even things he doesn't know what they mean (like when Squidward invited him to a strike, SpongeBob celebrated for it although he never heard the word before). This, along with his repetitive talking and loud dolphin- like laughter makes him a huge annoyance to others, especially Mrs. Puff and Squidward Tentacles.

34. Despite his stupidity, Patrick says bizarre, yet brilliant things from time to time. However, his friend SpongeBob is convinced he is a genius. He is SpongeBob's best friend and has quite a lot of things in common with him. Spongebob, is also an invertebrate. One of his most famous things to do is to walk into the Krusty Krab with his excellent catch phrase of "Good morning, Krusty Crew!". Patrick cooks up crazy ideas that often get SpongeBob and himself into a mess of trouble such as alien hunting, acting as adults with sideburns and not as babies in front of SpongeBob's Grandma, sneaking into Sandy's Tree dome in the wintertime, riding on fishing hooks, and many other situations. He fancies himself quite the jelly fisher, and loves many of the same things that Spongebob loves. His one-time goal in life was to defeat the evil monkey-man and save the ninth dimension, but Spongebob convinced him to aim at smaller goals.

35. Goo Lagoon