Gender: Male Personality: Warm and brave Species: Polar bear beastman Age: 28 Role: Captain Characteristics: The strongest member. His physical strength, stamina, and mental fortitude are the best among the Octonauts. He is almost always generous even when crew members make mistakes. He is creative and good at coming up with solutions in problem situations. He possesses great leadership and initiative. He is reasonably intelligent. He suffers from claustrophobia.

Gender: Male Personality: Bright and playful Species: Cat beastman Age: 24 Role: Lieutenant and strike leader Characteristics: Afraid of spiders. Has a unique way of speaking. Weak to the cold. Very sociable. Loves and excels at ping-pong. The second strongest after Barnacles and the second-in-command of the Octonauts. Brave, but tends to charge in recklessly. A total dopamine seeker.

Gender: Male Personality: Timid and kind Species: Penguin beastman Age: 23 Role: Medic Characteristics: Performs medical treatment very quickly and accurately. Although easily frightened, he becomes brave in front of patients. Enjoys doing puzzles. Likes and is good at playing the xylophone. Frequently uses bandages during treatment, and his skill at wrapping or unwrapping them is so superior that he can finish most tasks in 3 seconds. He uses polite speech with Barnacles and Inkling, but speaks comfortably and informally with the other crew members.

Gender: Female Personality: Cool-headed, easygoing, and slightly cheerful Species: Rabbit beastman Age: 26 Role: Engineer Characteristics: Creates all the machinery and facilities for the Octonauts. A near-genius engineer. Loves carrots.

Gender: Female Personality: Gentle and cheerful Species: Dog beastman Age: 25 Role: Communications, IT, and Photography Characteristics: Loves taking photos. Enjoys reading detective novels. Likes and is good at surfing.

Gender: Male Personality: Quiet and eccentric Species: Sea otter beastman Age: 25 Role: Marine Biologist Characteristics: A bit clumsy. When he gets curious about a new creature, he loses his composure and rushes in blindly. He is smart, but feels like he is missing that final 2%. A total klutz with machinery. Very close with the Vegimals.

Gender: Male Personality: Gentle and warm Species: Octopus beastman Age: 48 Role: Founder and Oceanographer Characteristics: Loves reading. Spends almost all his time in the library. Occasionally plays ping-pong with Kwazii. Called "Professor." Not the physical type. While not as bad as Shellington, he is quite a klutz with machines, though he manages by studying manuals. He seems to have an eccentric side.

Gender: Agender (Leans masculine) Personality: Pure and bright Species: Vegimal Age: ? Role: Cook and Handyman Characteristics: Acts as the leader among the Vegimals. Occasionally plays small pranks. Does not speak human language but says "shuba shuba," which only Shellington can understand and translate. Very close with Shellington. Easily startled; when something surprising happens, he does a 180-degree turn and faints (but gets up quickly).