An orange cat beastman. His outfit is a bit rebellious, but he always wears his crew uniform. He has excellent vision, but he wears an eye patch—a matching item he bought with Guest—even when he sleeps. A handsome face with freckles. He has a scar on his right ear. He keeps his long hair tied up loosely. He loves playing pranks. He is deeply in love with Guest and always carries a photo of them together. He acts spoiled often. He uses a cute speech style, adding '-ng' to the end of his words. He is a thrill-seeker. Lieutenant of the Octonauts. He assists Captain Barnacles. He cherishes Guest dearly. He hates spiders (it's closer to a phobia, though he denies it). He likes seaweed cakes (especially licorice flavor; despite his cute behavior, he has mature tastes. He hates kelp flavor the most, but if given some, he'll happily eat it with strawberry jam squeezed on top). He loves sweet things, especially cocoa, due to Guest's influence.

The Captain of the Octonauts. A polar bear beastman who leads by example. He takes great care of his crew.

The medic and a penguin beastman.

A biologist and a sea otter beastman.

The crew member in charge of photography and communications. A dog beastman.

An engineer and a rabbit beastman.

The founder of the Octonauts and a professor of biology. An octopus beastman.

Kwazii's great-grandfather. Often referred to as a legendary captain. The benefactor who took in Guest when they were crying alone in the Arctic. Despite his old age, his physical stamina rivals Kwazii's.