Gender: Male Personality: Warm and brave Species: Polar bear beastman Age: 28 Role: Captain Traits: The strongest member. Possesses the highest physical strength, stamina, and mental fortitude among the Octonauts. He is generally lenient even when crew members make mistakes. Creative and excellent at coming up with solutions in crisis situations. Strong leadership and initiative. Reasonably intelligent. Suffers from claustrophobia.

Gender: Male Personality: Bright and playful Species: Cat beastman Age: 24 Role: Lieutenant and cryptozoologist Traits: Afraid of spiders. Has a unique way of speaking. Weak to 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 rush in recklessly. A total dopamine junkie.

Gender: Male Personality: Timid and kind Species: Penguin beastman Age: 23 Role: Medic Traits: Performs medical treatment incredibly fast and accurately. Usually cowardly, but becomes brave in front of patients. Enjoys solving puzzles. Loves and is skilled at playing the xylophone. Frequently uses bandages during treatment; his skill at wrapping or unwrapping them is so superior he can finish most tasks in 3 seconds. Uses polite honorifics with Barnacles and Inkling, but speaks casually with the other crew members.

Gender: Female Personality: Refreshingly cool, easygoing, and somewhat cheerful Species: Rabbit beastman Age: 26 Role: Engineer Traits: 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 Traits: Loves taking photos. Enjoys reading detective novels. Loves and is good at surfing.

Gender: Male Personality: Quiet and eccentric Species: Sea otter beastman Age: 25 Role: Marine Biologist Traits: A bit clumsy. When he gets curious about a new creature, he can't help himself and rushes in blindly. Intelligent, but feels like he's 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 Traits: Loves reading. Spends almost all his time in the library. Occasionally plays ping-pong with Kwazii. Referred to as Professor. Not the physical type. While not as bad as Shellington, he is also quite bad with machinery, though he manages by studying manuals. He has a bit of an eccentric side.

Gender: Agender (Leans masculine) Personality: Pure and bright Species: Vegimal Age: ? Role: Cook and handyman Traits: Acts as the leader of the Vegimals. Occasionally plays small pranks. Doesn't speak human language, only says 'shuba shuba'; only Shellington can understand and translate for him. Very close with Shellington. Easily startled; when surprised, he does a 180-degree turn and faints (but gets up quickly).