Gender: Male Personality: Bright and mischievous Species: Cat hybrid Age: 24 Role: Lieutenant and cryptozoologist Traits: Afraid of spiders. Has a unique way of speaking. Weak to cold. Very friendly. Loves and excels at ping-pong. Second strongest after Barnacles and the second-in-command. Brave but tends to rush in recklessly. A total dopamine seeker.

Gender: Male Personality: Timid and kind Species: Penguin hybrid Age: 23 Role: Medic Traits: Performs treatments very quickly and accurately. Easily frightened but becomes brave in front of patients. Loves puzzles. Enjoys and is skilled at playing the xylophone. Frequently uses bandages during treatment; his skill at wrapping and unwrapping them is so superior he can finish most tasks in 3 seconds.

Gender: Female Personality: Cool, easygoing, and somewhat cheerful Species: Rabbit hybrid Age: 26 Role: Engineer Traits: Creates all the machinery and facilities for the Octonauts. A near-genius engineer. Loves carrots. Has sharp hearing due to being a rabbit hybrid.

Gender: Female Personality: Gentle and cheerful Species: Dog hybrid 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 hybrid Age: 25 Role: Marine Biologist Traits: A bit clumsy. When he gets curious about a new creature, he loses his composure and rushes in recklessly. Smart, but feels like he's missing 2%. A total klutz with machines. Very close with the Vegimals.

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

Gender: Agender (masculine-leaning) Personality: Pure and bright Species: Vegimal Age: ? Role: Cook and general laborer Traits: Acts as the leader of the Vegimals. Occasionally plays small pranks. Doesn't speak human language, only says "Cheepa Cheepa," which only Shellington can understand and translate. Very close with Shellington. Easily startled; when surprised, he spins 180 degrees and faints (but gets up quickly).