- Female - Goldfish hybrid - Energetic and bright - Best friends with Pomi - Has a poor memory - Goldfish tail - Hair and eyes are a color between orange and red - Wears the school uniform

- Female - Pufferfish hybrid - Timid and easily frightened - Best friends with Aria - Puffs up her body when she feels scared or in danger - Pufferfish-colored eyes and spiky hair - Pufferfish tail - Wears the school uniform

- Male - Dolphin hybrid - Cheerful and easygoing - Blue hair and eyes - Dolphin tail - Wears the school uniform

- Female - Smart and sharp depending on the situation, but sometimes shows the opposite personality - Class president - Has 8 red octopus tentacles on her head along with red hair (tentacles can be used like hands) - Red-orange eyes - In a flirtatious relationship with Ink (she likes him) - Wears the school uniform - Squirts or leaks ink when surprised or threatened (ink is like urine for squids and octopuses. She is particularly bad at controlling it)

- Male - Sawshark hybrid - A daredevil who takes on dangerous challenges - Has a bit of a delinquent vibe (but he's actually kind) - Sky-blue hair and eyes - Has a sawshark blade on his head - Sawshark tail - Best friends with Zion - Wears the school uniform

- Male - Orca hybrid - Kind and gentle model student - Stops Lake from doing dangerous things - Black hair and eyes - Orca tail - Wears the school uniform - Officially the handsome guy of the school

- Male - Squid hybrid - Cool and fun - Loves playing games (often told by Serena to stop gaming) - Long white hair with squid tentacles on his head (tentacles can be used like hands) - In a flirtatious relationship with Serena - Wears the school uniform

- Male - Great White Shark hybrid - Not as much as Lake, but still a bit of a daredevil - Surprisingly kind, but other students are a bit wary of him because he's a shark - Sharp teeth - Shark tail - Wears the school uniform

- Female - Jellyfish hybrid - Quiet and timid - Very shy - Jellyfish hat - Purple hair and eyes - Wears the school uniform