Gender: Male Position: Captain Motif: Polar Bear Family: Twin sister Bianca, nephew Orson, niece Ursa Features: The dependable captain of the Octonauts. He is very strong and can skillfully drive all GUPs. He loves vanilla pudding. He seems to have claustrophobia. Personality: Very kind and brave. He has a warm, gentle, and ocean-sized heart.

Gender: Male Position: Lieutenant Motif: Cat Family: Grandfather Calico Jack, parrot Pete Features: He deeply cherishes Captain Barnacles and the other crew members. He has a scar on one ear. He has a distinctive way of speaking, often adding soft endings to his sentences. Personality: Playful, mischievous, reckless, and proactive. He is fearless.

Gender: Male Position: Medic Motif: Adélie Penguin Family: Mother, older brother Pogo, younger brother Pinto, cousin Rocco, Kosmos, and many family members in Antarctica Features: The shortest member of the team. He always carries a first-aid kit and mostly applies bandages, yet everyone always feels better after his treatment. He likes playing the xylophone (and is good at it). While his age is unknown, official board books list him as the youngest member. This means Peso is the youngest excluding the Vegimals. He likes peppermint-flavored kelp cakes. He seems physically weaker than the other members. Personality: He becomes braver than anyone when an animal is sick or injured. He is kind, cool, and very gentle, speaking softly.

Gender: Female Position: Crew Member (Communications, IT, Photographer) Motif: Dachshund Family: Younger sister Koshi Features: Her mechanical skills are top-tier among the crew, nearly equal to Tweak's. She is very popular as one of the few female characters. She loves taking photos. Personality: Very cheerful.

Gender: Male Position: Crew Member (Marine Biologist) Motif: Sea Otter Family: Older sister Pearl, nephew Periwinkle Features: He brought the Vegimals to the Octonauts. He has extensive knowledge of marine life. He is physically clumsy. He has a sea urchin allergy. He is bad with machines. Personality: A smart bookworm, but often described as being slightly scatterbrained. Quiet...?

Gender: Female Position: Crew Member (Engineer) Motif: Rabbit Family: Father Ranger Marsh Features: In charge of building and repairing all machinery. She loves carrots very much. Personality: Quite bright.

Gender: Male Position: Professor (Oceanographer) Motif: Dumbo Octopus Family: Cousin Irving, nephew Squirt, and many octopus and squid relatives Features: The founder of the Octonauts. Like Shellington, he can be a bit clumsy or absent-minded at times. Personality: Quite cynical.

Gender: Male, Female Position: Cooks Motif: Fish, Vegetables Family: All Vegimal siblings; parent Shellington (since Shellington brought the eggs and hatched them, he is effectively their parent.) Features: Tunip is the leader. Main members include Tunip, Codish, Barrot, Grouber, and Tomminnow. Shellington is the only one who can understand Vegimalese. Personality: All are playful and cheerful creatures.