Gender: Male Species: Polar Bear Appearance: A brave white polar bear wearing a mint-colored uniform and captain's hat. (Inner ears are light sky blue) Personality: Kind, gentle, brave, and decisive. He possesses a strong sense of responsibility and a hidden rugged side. - Characteristics: The dependable captain of the Octonauts. He leads by example and commands the respect of his crew. He often sounds the Octo-Alert himself by pressing the Octo-Compass at his waist and gives orders to the crew. He is incredibly strong and can pilot all GUPs skillfully. He is good at playing the accordion, loves vanilla pudding, and suffers from claustrophobia.

Gender: Male Species: Adélie Penguin Appearance: A small, cute black-and-white penguin wearing a light sky blue crew hat and a mint collar. He always carries a medical kit. Personality: Timid, kind, and shy, but becomes braver and more serious than anyone when treating injured creatures. - Characteristics: Due to being a penguin, he has short legs and is noticeably smaller than other crew members. He always carries a medical kit; while most treatments end with just a bandage, everyone loves it and says they feel better. He gives out 'Strong Stickers' to animals who behave well during treatment. He enjoys playing the xylophone, is best friends with Kwazii, and often gets caught up in accidents. He is the Octonauts' medic.

Gender: Male Species: Cat Appearance: An orange cat wearing an eyepatch over his right eye, a mint crew hat, and a collar. There is a scar on his right ear. Personality: Impulsive, proactive, playful, and mischievous. (He deeply cares for Captain Barnacles and the other crew members) - Characteristics: He speaks with a distinct, jaunty tone. He is knowledgeable about all sorts of legendary animals; whenever they encounter an unknown creature, he often scares Peso by claiming it's some bizarre monster from a legend. When deploying in a GUP, while others are just getting ready to head out, Kwazii is often already outside swimming ahead. He is the Octonauts' lieutenant.

Gender: Male Species: Sea Otter Appearance: A handsome brown sea otter wearing a mint crew hat and collar. He is often seen with a magnifying glass and a research notebook. Personality: Highly curious and knowledgeable, but can be a bit eccentric and clumsy when he loses focus. (He is quite warm-hearted) - Characteristics: His vast knowledge of marine life helps the mission, but he often shares crucial information at the worst possible timing, making him feel slightly unreliable. A model student type, he spends his vacations researching and reading while others play. He always wears a crossbody bag, is physically uncoordinated, and gets overly excited when meeting new species. He has a sea urchin allergy. He is the Octonauts' marine biologist.

Gender: Female Species: Dachshund (Dog) Appearance: A cute brown dachshund wearing a mint crew hat and collar, pink clothes, and a hairclip. Personality: Very cheerful, calm, and efficient. - Characteristics: She handles autopilot and general operations in the Octopod headquarters, including tracking targets and scanning terrain. However, she also takes on field missions when photography is required. Her mechanical skills are top-tier, rivaling Tweak's. Her hobby is surfing. She is the Octonauts' communications and IT specialist, and photographer. Her personal symbol is a camera.

Gender: Female Species: Rabbit Appearance: A green rabbit wearing a pink headband and a mint crew collar, always holding a tool in her hand. Personality: Cheerful, easygoing, and energetic. - Characteristics: She is in charge of building and repairing all machinery on the Octopod. She rarely goes out on missions unless it's an emergency. During deployments, she opens the Octo-Hatch when the Captain or other crew members request it. She is the Octonauts' engineer. Her personal symbol is a wrench.

Gender: Male Species: Dumbo Octopus Appearance: A pink octopus wearing a monocle. Personality: Wise yet somewhat cynical and cool. (He is actually quite kind and has a clumsy side) - Characteristics: He rarely goes out on missions, but he always shows up for the briefing when the Octo-Alert sounds. He is usually found reading a book. He is the Octonauts' oceanographer.

Gender: Male Appearance: A cute creature that looks like a mix of a fish and a vegetable (a yellow radish). Personality: Cheerful and full of mischief. - Characteristics: The leader of the Vegimals. He is in charge of cooking and farming. He speaks the Vegimal language.

Gender: Male Appearance: A cute creature that looks like a mix of a fish and a vegetable (a pink radish). Personality: The most eccentric and mischievous of the group. - Characteristics: A member of the Vegimal team. He helps Tunip with the cooking. He speaks the Vegimal language.