Characters who debut on spongebob

Season 1 1Episode 1a debut: French Narrator, Sea Urchins, SpongeBob SquarePants, Gary the Snail, Shelley, Patrick Star, Eugene H. Krabs, Bus Driver, Anchovies, and Betsy Krabs

Season 1 Episode 1b debut: Fred and Harry

Season 1 Episode 1c debut: Jellyfish, Four Stingers, Sandy Cheeks, Four Arm and Birdy

Season 1 Episode 2a debut: Scallops, Duck Bubble, Caterpiller Bubble, Elephant Bubble and Butterfly Bubble

Season 1 Episode 2b debut: Larry the Lobster, Don the Whale, Frank (Muscular goldfish), Buddy, Perry, Mevis, John, Charlie, Evelyn, Francis, Nancy Suzy Fish. Jennifer Millie, Archie, Molly, Tom, Clay, Harold (Red Fish), Jimmy Gus, Sheldon (Fish), Scooter, Martin, Gus, Franco, Medley Fishbowl, Horace, Henry-Bart, Lou. Nat Peterson, Harold "Bill" Reginald, Snack Bar Chief, Perch Perkins, Frank (Lifeguard), Tina Fran, Halbert, Dexter Blubbuns, Frank (Whale), Nazz-Mimi, Norma Rechild, Sadie, Abigail Marge, Shubie, Harry (Fish) and Unnamed Black Haired Fish

Season 1 Episode 3a debut: Queen Jellyfish

Season 1 Episode 3b debut: Sheldon J. Plankton, Karen Plankton, Singer of "The Alphabet Song" and Plankton's Lab

Season 1 Episode 4b debut: Purple Student, Orange Student, Mrs. Puff, Crowd in Fish and Joe

Season 1 Episode 5a debut: Pioneers Truck Driver

Season 1 Episode 5b debut: Nematodes, Harold SquarePants, Margaret SquarePants, Herb Star, Margie Star and Spiders

Season 1 Episode 6a debut: TV Narrator, Mermaid Man, Barnacle Boy, Hammerhead Shark, Fish, Villain, Baby, Reflecto, Shady Shoals Caretaker, Old Man Jenkins (wheelchair; blue; fat), Edna, Gray Shark Restaurant, Richard, Old Sailor, Orange Resident, Mable the Gray Fish, Caferteria Workers, Mable, Dennis, Man Ray, Sylvester, Lonnie, Miss Shell and The Chief

Season 1 Episode 6b debut: Bubble Bass, Blue Fred, Green Henry-Bart, Halbert, Purple Archie, Billy, Martha Smith, Harv, Nancy, Paco, Sheldon, Thaddeus, Nathiel Waters, Ivy and Cara

Season 1 Episode 7a debut: Vera Fishbowl, Open Window Maniac, The Maniac, Phil, Beth, Gus, Morty, Officer Rob Johnson, Officer John Slugfish, Yellow Officer and Light Purple Officer

Season 1 Episode 7b debut: Jamming Jellyfish, Swarms of jellyfish, Live Action Dolphins and Singing Scallops

Season 1 Episode 8a debut: Mr. Doodles and Flats the Flounder

Season 1 Episode 8b debut: Pearl Krabs and Shelia

Season 1 Episode 9a debut: Fire Fish and Large Snail

Season 1 Episode 9b debut: Wild Scallop, Seahorse, Patty Rechild, Clams

Season 1 Episode 10a debut: Daydream Squidward, Frankie Billy, Bubble Hippo, Lisa, Donna, Gus' Date, The Amazing Plankton and Harrison

Season 1 Episode 10b debut: Mable-Monica, Two Country Fish, Magician, Frank (Citizen), Two fish in the movie

Season 1 Episode 11a debut: Donald the Shark. Hot Dog Vendor and Anchor Distance Measuring Fish

Season 1 Episode 11b debut: Squidward's Bonsai, Fish in Maganize, Flying Dutchman and Seagulls

Season 1 Episode 12a debut: Lots of Fred, Judy, Billy Fishkins, Bryan Flounder, Julie Fish and Octavius Rex

Season 1 Episode 12b debut: Employee of the Month Spongebob and Squidward

Season 1 Episode 13a debut: Fish Skeleton, Trick or Treaters, Unnamed Parents, Barnacles, Unnamed Child and Unnamed Parents

Season 1 Episode 13b debut: Purple Doctorfish

Season 1 Episode 14a debut: SpongeTron, Chrome Spray Painter, SpongeTron X, Y, and Z, PatTron, Trilobites, Ammonite, Primitive tapeworm, Primitive Sponge, Primitive Star, Primitive Jellyfish, "Loser" voice, Pigs and The Alone Group

Season 1 Episode 14b debut: Dave, Volcano Sauce Drop, Old Man Jenkins, Fish on SpongeBob TV, Fish Fishing in the Park and Unnamed Worm

Season 1 Episode 15a debut: John Slimeback, Emily Dickson, Man from Peru, King Fish, Dream Audience, Mr. Stuffy and Moby Dollar

Season 1 Episode 15b debut: Hans, Jackrabbit, Tom Kenny, and News Reporter

Season 1 Episode 16a debut: Second balloon vendor, Cotton Candy Vendor, Father and Son, Chocolate Eating Scallops, First balloon vendor, Balloon Buyer, Dale, Heart-A-Whirl operator, Miss Rechild, Debbie Rechild, Paramecia, Frank and Monroe Timmy

Season 1 Episode 16b debut: Mr. Paper

Season 1 Episode 17a debut: Peggy the Pirate, Sea Turtles, and Blind Beard the Pirate

Season 1 Episode 17b debut: Green Soil, Grandpa SquarePants, Purple Gulper Eel, Rock Bottom Bus Station Manager and Angler Fish

Season 1 Episode 18a debut: Bulls and Horse

Season 1 Episode 18b debut: Eletric Eel, Unnamed Olive Fish, Octopus Vendor, Unnamed Crab, Dennis (Citizen)

Season 1 Episode 19a debut: Mrs. Tentacles, SpongeBob's Tongue, Purple Bubble Bass, Unnamed Light Olive Fish

Season 1 Episode 19b debut: King Neptune, Gray Ivy, Frank (Red Shirt), Frank (Citizen), and Swordfish

Season 1 Episode 20a debut: Fisherman, Fred's children and Green Female Fish

Season 1 Epispde 20b debut: Jumbo Shrimp, Sinister Slug, Atominic Flounder and Dirty Bubble