The list of characters in The Adventures of Mermaid Man and Barnacle Boy.

Main Characters

  • Mermaid Man: A semi-retired superhero.
  • Barnacle Boy: Mermaid Man's semi-retired superhero sidekick
  • Manray: Mermaid Man's arch-enemy
  • Dirty Bubble: A giant bubble villian who is an enemy of Mermaid Man and Barnacle Boy
  • The Moth: Mermaid Man's most powerful enemy

Major Characters

  • Original IJLSA Members
    • The Quickster: A IJLSA member that has the ability to run really quick
    • The ElasticWasteband: A IJLSA member that has the ability to bend his body into fantastic shapes and forms
    • Captain Magma: A IJLSA member that has the ability to shoot lava from a volcano on stop of his head by yelling "Krakatoa"
    • Miss Appear: A IJLSA member that has the ability to turn invisable.
    • Pi-Right Ponderer: A IJLSA member that has the ability of smarts
  • Atomic Flounder: A retired villain who can blast hot radioactive beams from his mouth, capable of third degree burns from his beans, he waers a radio active suit and speaks with a Kennedy-esque New England accentedy-esque New England accent
  • Sinister Slug: One of Mermaid Man and Barnacle Boy's most hated villians, he is a slug, and his slime is strong enough to hold down almost anybody
  • Jumbo Shrimp (The Killer Shrimp): A shrimp like villian with really sharp claws.
  • Kelp Thing: Kelp Thing is a humanoid, possibly human, covered with seaweed. He doesn't appear to have super powers and parks illegally
  • Sneaky Hermit: A super hermit crab who plans to rule the world by means of sneakiness. He steals buildings in a sneaky fashion. His weakness is pepper.
  • Reflecto: Reflecto uses mirrors in his evil schemes, and if he is ever cut off from sunlight, he loses his power
  • Reflekta: Reflekta is the genderbent version of Reflecto.
  • SpongeBob SquarePants: A sponge who either annoys, causes problems, or sends people to the hospital.
  • Patrick Star: SpongeBob's idiotic best friend
  • Sheldon J. Plankton: A evil scientist that always tries to rule the world, destory the Krusty Krab and promote his restraunt, The Chum Bucket, or compain to his computer W.I.F.E. (Karen)

Minor Characters

  • Sandy Cheeks: A scientist from Texas
  • Mr. Krabs: SpongeBob's boss, owner of the Krusty Krab
  • Gary the Snail: SpongeBob's pet
  • Squidward Tenticles: A citizen who likes to complain about wanting to be artistic
  • Squilliam Fancyson: A rich and successful citizen that says Squidward "Sucks eggs in high school"
  • Pearl Krabs: Mr. Krab's daughter who is a whale
  • Harold Bill: A generic blue fish who usually wears a white shirt and red pants
  • Nat Peterson: A generic yellow fish with a purple fin on his back
  • Nancy Suzy Fish: A grey white-haired fish who is the most commonly used female character model
  • Fred Rechid: A dark-greenish brown fish
  • 'Monroe Rechid: 'An orange fish who is Fred and Sadie's son
  • Larry the Lobster: A muscular red lobster who is a common patron and lifeguard of Bikini Bottom's popular beach, Goo Lagoon
  • Miss Shell Rechid: Miss Shell is an old purple fish who wears a blue dress and has gray hair
  • Shubie: A pink fish who regularly visits the Krusty Krab and Goo Lagoon
  • Sandals: A green fish that wears blue shorts with white flowers and sandals
  • Old Man Jenkins: An elderly green fish

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