Captain of the Octonauts Male Species: Polar Bear Beastman Height: 190cm Personality: Gentle, warm Appearance: White short hair with polar bear ears. Blue eyes. Wears blue clothes and pants, with a compass communicator at his waist. Traits: The leader of the Octonauts. As a polar bear, he is the strongest among the crew. He can play the red accordion. In emergencies, he instructs others to sound the Octo-Alert. Family includes his younger sister Bianca and his nephew and niece, Orson and Ursa. He uses polite speech with Professor Inkling and informal speech with everyone else.

Male Species: Cat Beastman Height: 186cm Personality: Mischievous, a bit of a show-off (but deeply cares for the crew) Appearance: Orange hair with a black pirate eye patch. Has orange cat ears on his head and a cat tail. Usually wears orange pirate attire. Traits: A troublemaking pirate cat. Being a cat, he loves playing with balls of yarn. He hates spiders. He always carries a telescope. Family includes his grandfather Calico Jack and his parrot Pete. He uses polite speech with Professor Inkling and Captain Barnacles, and informal speech with the rest. He sometimes adds a cute 'ng' sound to the end of his sentences.

Male Species: Penguin Beastman Height: 170cm Personality: Timid, kind-hearted Appearance: Black hair and black eyes. Usually wears a penguin hat and black clothing. Traits: As the medic, he always carries a first-aid kit. He comes from a huge family (typical for penguins), but the ones he sees most are his younger brother Pinto and his mother. He uses polite speech with Captain Barnacles and Professor Inkling, and informal speech with the other crew members.

Male Species: Sea Otter Beastman Height: 187cm Personality: A bit eccentric, cheerful Appearance: Brown hair and brown eyes. Has brown sea otter ears and a tail. Usually wears brown clothes but sometimes wears a lab coat over them. Always carries a small blue bag. Traits: One of his favorite things is conducting (sometimes dangerous) experiments. He has a crush on Dashi. Family includes his older sister Pearl and his nephew Periwinkle. While he often seems a bit clumsy or spacey, he is a brilliant biologist with vast knowledge of marine life and a lot of curiosity. He is the only Octonaut who can fully translate Tunip's speech. Despite being a sea otter, he is allergic to sea urchins. He uses polite speech with Captain Barnacles and Professor Inkling, and informal speech with the others.

Female Species: Dog Beastman Height: 164cm Personality: Kind, sweet Appearance: Long brown hair and brown eyes. Has brown dog ears and a dog tail. Wears two hairpins—one sky blue and one pink—and a blue beret. Usually wears a pink dress with a brown cardigan over it. Traits: Photographer, communications officer, and computer expert. She loves taking photos and always carries her yellow camera. Unless it's a special situation, she usually pilots the Octopod. She loves surfing and is very good at it. She has a slim build. She is close friends with Tweak. Her mechanical knowledge is almost on par with Tweak's. Family includes her younger sister Koshi, and she is friends with the cave exploration expert Lyla. She uses polite speech with Captain Barnacles and Professor Inkling, and informal speech with the others.

Male Species: Octopus Beastman Height: 184cm Personality: Benevolent Appearance: Pink hair and wears a yellow monocle. Usually sits in a sky-blue chair. Traits: The founder of the Octonauts and an oceanographer. He usually reads books in the library while listening to classical music. He is extremely knowledgeable.

Female Species: Rabbit Beastman Height: 168cm Personality: Cheerful Appearance: Green ponytail, green rabbit ears, and green eyes. Always wears a pink headband. Usually wears a short-sleeved black shirt, khaki pants, and a lime-green windbreaker. Always carries a wrench at her waist. Traits: The engineer of the Octonauts. She built the Octopod and all the Gup vessels. As an engineer, she has extensive mechanical knowledge. Her rabbit ears allow her to hear much better than the other crew members. She loves carrots. She is very close to Dashi and sometimes designs or tests Gup vessels with her. Family includes her father, Ranger Marsh. She uses polite speech with Captain Barnacles and Professor Inkling, and informal speech with the others.

Male Species: Vegimal (Half-human, half-vegetable) Height: 80cm Personality: Cheerful Appearance: Yellow hair and yellow eyes. Has a vegetable stem on his head and wears a chef's hat. Wears a yellow child-sized chef's outfit. Traits: The cook of the Octonauts. He is in charge of the meals and is an excellent cook (mostly makes desserts). He speaks in mumbles.