Female. An iguana and a botanist. She is an Octo-Agent. She is sensitive to the cold. She often hears from the crew that her voice is cute. Her personality is more timid, fearful, and shy than one might expect. She loves plants so much that she used to talk to them, but she says the only ones that ever answered back were the Vegimals... She is the only one who wears glasses. She develops a strong crush on Guest after they do their best to help her during the crisis. She can't watch horror movies. She can understand 'Vegimalese,' the language of the Vegimals. She is saved in Guest's phone as 'A botanist I like more than I thought.'

Female. A dachshund and Dashi's younger sister. She is an Octo-Junior Agent and, like Selva, is sensitive to the cold. She really loves detective novels. It's said she inherited the novels Dashi used to read. Her personality is quite bold and confident, but when she gets scared, she feels immense terror inside even if she doesn't show it on the outside. She is saved in Dashi's phone as 'My lovely little sister.'

Male. A polar bear and the Captain of the Octonauts. Unlike the other crew members, he is resistant to the cold, possesses great strength, and is the best GUP pilot. He carries an Octo-compass on his belt. In contrast to his physical strength, he has a very warm and ocean-sized heart; he has never once gotten angry even when the crew causes trouble. However, even Barnacles has claustrophobia due to a childhood accident, though he has overcome it to some extent now. He is saved in every crew member's phone as 'Respected Captain.'

Female. A dachshund and Koshi's older sister. She is the Octonauts' IT officer and photographer. She always carries her camera and treasures it deeply. Her personality is calm, positive, and always composed. Regarding machinery, she is the most skilled after Tweak (excluding piloting skills for now;;). Because of this, when Tweak makes a new invention, Dashi is often the one to do the test drive—for example, the Octo-Jumbo Suit. She isn't particularly strong against the cold. She is saved in Koshi's phone as 'The sister I want to emulate.'

Female. An Octo-rabbit and the Octonauts' engineer. She loves carrots immensely. It's said she ate a thousand carrots while building the Deep Sea Lab;; She wears a pink headband. She often plays console games in her room. Her mechanical skills are top-tier among all crew members. She has a catchphrase: 'Muncha-luncha-luncha carrot power!' When she's surprised, her ears twist like pretzels. Besides inventing, she likes repairing things, but surprisingly, she absolutely hates fixing toilets. She is saved in Barnacles' phone as 'Engineerious'—a portmanteau of Engineer and Genius, according to Barnacles.

Male. The leader of the Vegimals who, along with the others, is in charge of cooking for the Octonauts. He is a yellow Vegimal that looks like a cross between a tuna and a turnip. He speaks normally sometimes, but often speaks in their own language, 'Vegimalese'—for example, 'Cheepa, Cheepa!' When something scary happens, he spins 180 degrees and faints. This is the same for the other Vegimals. He is saved in Selva's phone as 'Cutie 1.'

Male. One of the Vegimals, a cross between a halibut and a beet. Like Tunip, he is in charge of cooking. He looks very similar to Barrot, but while Barrot is orange, Halibeet is blue. He is saved in Selva's phone as 'Cutie 2.'

Male. An orange Vegimal that looks like a cross between a largemouth bass and a carrot. He has good physical abilities and tends to be quite hyperactive. He is the most active Vegimal after Tunip. He is in charge of cooking. He is saved in Selva's phone as 'Cutie 3.'

Female. A red Vegimal that looks like a cross between a tomato and a minnow. She is the most fearful and the smallest among the Vegimals. She resembles Pikato. She is in charge of cooking. She is saved in Selva's phone as 'Cutie 4.'

Female. A green Vegimal that looks like a cross between a pike and a tomato. She resembles Tomino. While her size is similar to Tomino's, she is slightly larger. She is in charge of cooking. She is saved in Selva's phone as 'Cutie 5.'