Characters / The Octonauts

The sheet for all characters appearing in The Octonauts and Octonauts: Above & Beyond.

The Octonauts

Led by Captain Barnacles Bear, the Octonauts is a group of eight adventurers dedicated to explore the ocean and protect sea creatures from danger.

As A Whole

• Alliterative Name: All except Inkling and Tweak.
• Badass Crew: A group of animals who save animals from danger.
• Badass Adorable: All of them.
• Blue Is Heroic: Every member of the group wears at least one blue accessory.
• Fingerless Hands: Their hands resemble mittens, except Peso has no fingers at all.
• Freudian Trio: Demonstrated in the first ten seconds of the opening theme. Kwazii is a daredevil (Id), Peso's a thinker (Superego) and Barnacle is The Leader (Ego).
• Mixed Animal Species Team: The team are undersea explorers consisting of a polar bear, a cat, a dog, a penguin, a sea otter, a rabbit, an octopus, and a group of plant-animal hybrids.
• Power Trio: Barnacle, Kwazii and Peso.See Freudian Trio above. They're the main octonauts.
• Ridiculously Cute Critter: They are all designed to be as cute as possible.
• Semiaquatic Species Sailor: Three members of the crew fit this trope: Peso who is a penguin, Barnacles who is a polar bear, and Shellington who is a sea otter. The rest of the crew includes one fully-aquatic creature, Professor Inkling the octopus, and the rest are all land mammals.
• Species Surname: Except for Professor Inkling, all the crew members have their species as their last names.
• True Companions: They all have each other's backs no matter what happens.
• Vague Age: We can assume they're at least young adults.

Captain Barnacles Bear

Captain Barnacles Bear

"Octonauts, let's do this!"

Voiced in English by: Simon Greenall (speaking), Ross Breen (singing, original series), Simon Foster (singing, Above and Beyond)

Voiced in Spanish by: Jorge Lillo

The Leader of the Octonauts. Barnacles is a polar bear who commands every mission the Octonauts perform. Being always the first to help whenever someone is in danger, he is loved by his entire crew, and he loves his crew back.

• Alliterative Name: Barnacles Bear.
• All-Loving Hero: Is as caring about sea creatures as he is serious about his work.
• Authority Sounds Deep: He is the leader of the crew and has deepest voice of the main cast.
• Beary Friendly: Likely the nicest character on the show next to Peso. And he is so cute!.
• Blue Is Heroic: More than any other member. His entire wardrobe is blue (or at least has blue accents).
• Catchphrase:
  • When The Plan has been formed: "All right, Octonauts, let's do this!"
  • When Kwazii has a Leeroy Jenkins moment: "Kwazii..."
• Claustrophobia: "Octonauts and the Cave of Sac Actun" reveals he's afraid of enclosed tunnels after falling in a tightly enclosed and very deep hole when he was a cub and being stuck for several hours.
• Cute Bruiser: "Bruiser" might be a stretch, but he sure is cute.
• The Captain: He leads the underwater crew.
• Dreadful Musician: He can't play the accordion, his awful playing once attracted a pod of orcas.
• Dub Name Change:
  • He is Polar in the Spanish and Portuguese dubs.
  • He is also Barnius in the German dub.
• Embarrassing Nickname: "Feather Paws" by his sister Bianca because she could always beat him at wrestling.
• The Good Captain: Always looking out for his teammates.
• Genius Bruiser: Barnacles is incredibly strong, but he is by no means stupid.
• Gentle Giant: Not that large, but strong is sweet natured.
• Father to His Men: When asked, he explains that he takes care of his crew.
• Fully-Dressed Cartoon Animal: The only character on the show to be fully-clothed.
• Invisible Parents: His parents are never mentioned.
• I Was Beaten by a Girl: According to Bianca, she always beat him at play-fights when they were kids. She calls him "feather paws".
• The Kirk: To Kwazii's McCoy and Peso's Spock.
• Not So Above It All: Occasionally indulges in the others' shenanigans, for example, repeating Tweak's catchphrase.
• Out of Focus: His role in the series is reduced in Above and Beyond.
• The Paragon: The Octonaut. He is the leader for a reason.
• Reasonable Authority Figure: He is as fun-loving as the other Octonauts.
• Red Oni, Blue Oni: Blue, to Kwazii's red.
• Singing Voice Dissonance: His voice is much deeper when he sings in the Great Barrier Reef movie.
• Super-Strength: Strong enough to lift a giant clam.
• Tuft of Head Fur: He is revealed to have one under his hat in the Ring of Fire movie. In an early episode he didn't have one when he lost his hat.
• Vocal Evolution: His singing voice is deeper in later episodes.

Kwazii Cat

Kwazii Cat

Voiced in English by: Rob Rackstraw

Voiced in Finnish by: Antti Pääkkönen

Voiced in Spanish by: Rodrigo Saavedra

Barnacles' first lieutenant. Kwazii is an impulsive cat with a mysterious pirate past. He believes in so many different kinds of sea monsters and legendary beasts that he's also considered the crew's cryptozoologist instead of just a lieutenant.

• Adaptation Name Change: Downplayed, his surname was "Kitten" in the books.
• Adventurer Archaeologist: For all that he proclaims that he's a pirate, Kwazii's interests in exploring mysterious places and locating artifacts has him much closer to one of these.
• Berserk Button: When Kwazii's around, you treat Captain Barnacles with respect. And it does not matter even if you don't know who he is.
• Captain Crash: It's not that Kwazii can't bring a craft in safely, but safety is one of the first things he overlooks when he gets overly excited. Tweak lampshades this when repairing the GUP-B at one point.
• Catchphrase: "Shiver me whiskers!"
• Cute Kitten: Not an actual kitten, but this counts.
• Ear Notch: He has a small chunk taken out of his right ear.
• Eyepatch of Power: To go along with the pirate theme, as well as to emphasize his action-oriented nature, he bears one. A few times, he lifts it to reveal that it's just an affectation and that both of his eyes work fine.
• Fiery Redhead: His fur is more orange than red, but boy, is he fiery!
• Friendly Pirate: Kwazii is a former pirate, and he's currently an Octonaut who helps save sea creatures. He still talks in pirate slang and is fond of finding treasure when he gets the chance. Kwazii's grandfather Calico Jack from "The Amazon Adventure" is still a pirate in the present day, but he's amiable and loving to his grandson.
• Gender Flip: In the original books, Kwazii was female. Reprints of the books and the show have him as male.
• Half-Dressed Cartoon Animal: Only wears a hat, eyepatch, neckpiece, and shoes.
• Hot-Blooded: Any time the prospect of action comes up, Kwazii at the bare minimum eagerly volunteers.
• Identical Grandson: Kwazii is virtually identical to his grandfather, Calico Jack. The difference is in their outfits - Calico Jack dresses like a stereotypical Pirate, while Kwazii has the collar and boots of an Octonaut, with the only pirate affectation being an eyepatch. Also, the two wear their eyepatches on different sides.
• Invisible Parents: Although we see his grandfather, his parents are never seen.
• Keet: Oh dear god.
• Know-Nothing Know-It-All: Kwazii is always claiming a random animal as a sea monster, and he's wrong every time.
• Leeroy Jenkins: In spades. One Running Gag is that Barnacles will tell the assembled team what they need to do, and when he turns to Kwazii, he finds that Kwazii has already jumped into the water and is swimming towards the objective.
• The McCoy: To Barnacles' Kirk and Peso's Spock.
• Nice Guy: Kwazii is rather short tempered, impatient and rebellious, but also one of the most easiest Octonauts to become friends with.
• Nightmare Fetishist: On the "fascination with creepy things" end of the scale.
• Non-Standard Character Design: He has slanted eyes as opposed to the round eyes sported by everyone else.
• Number Two: To Captain Barnacles.
• Out of Focus: His role was greatly reduced in Above and Beyond, bordering on Demoted to Extra.
• Pirate: He is very proud of being a pirate. However, this is also overlaps with The Pirates Who Don't Do Anything.
• Red Oni, Blue Oni: Very, very red to Barnacle's blue.
• Sensitive Guy and Manly Man: The Manly Man to Peso's Sensitive Guy.
• True Companions: Barnacles is his best friend as proven by the fact that they work together the most and their various fist bumps. The other Octonauts are equally important to them; the instant any of them are in trouble, and Kwazii is eager to rush in to help them out.
• Verbal Tic: Tends to refer to fish(es) as "fishy/fishies".
• Vibrant Orange: An orange-furred cat who's easily the most brash, energetic, and hotheaded Octonaut.
• Vocal Evolution: His voice is higher in later episodes.
• Why Did It Have to Be Snakes?: He is afraid of spiders. Spider crabs are an exception, though.
• Youthful Freckles: Complimenting his energetic free spriit.

Peso Penguin

Peso Penguin

Voiced in English by: Paul Panting (UK version), Wayne Grayson (US version)

Voiced in Finnish by: Antti Jaakola

Voiced in Spanish by: Pedro Puga

The medical officer of the Octonauts. He is a nice penguin who likes helping people. Peso is a bit shy and can be scared easily, but whenever someone needs help, he is the first to go into action.

• Alliterative Name: Peso Penguin.
• All-Loving Hero: See his second Catchphrase - he wants to make sure everyone is healthy and happy, and he works hard at it.
• Badass Pacifist: Regardless of the situation, Peso will never attempt to hurt or even hold back anyone doing anything threatening, even if he's under threat - he won't even use his absurdly fast bandaging skills to leave them Bound and Gagged. This does not stop him from stepping up to help out anyone who needs help. There's also the fact that he's extremely skilled at the various skills of penguins - he tied a professional athlete at the penguin equivalent of a triathalon.
• Bilingual Bonus: Peso's name refers to the currency used in some Spanish-speaking countries. Even the US version even gives him a Hispanic accent to match!
• Catchphrase:
  • When surprised or alarmed: "Flappity flippers!"
  • When someone needs medical attention: "I'm a medic. I help any creature who is sick or hurt, no matter what."
• Cowardly Lion: He typically will hang back in more dangerous situations, sometimes hiding behind Barnacles or Kwazii when hearing about or seeing anything dangerous. The second someone needs medical attention, though, he immediately puts all that aside and acts quickly to save whoever needs it.
• Disappeared Dad: His father is never seen.
• Dub Name Change: His name is Pepe in both Spanish dubs.
• Funny Foreigner: The US version has him with a heavy Spanish accent.
• Gratuitous Spanish: In the US version, he'll occasionally use Spanish words such as "adios".
• Lovable Coward: But he can be brave when he has to be.
• Sensitive Guy and Manly Man: The Sensitive Guy to Kwazii's Manly Man.
• The Load: Sometimes he becomes this, as usually he is the member who gets in troubles more of the time, and the rest of the crew are about to save him. Also, sometimes they must explain him, step by step how to make well some things.
• The Medic: Anyone is hurt, and he's on the case immediately. In a few episodes, the drama is due to either getting the injured patient to him or getting his medical bag back to him so that he can administer treatment.
• The Heart: He always goes out of his way to help sick animals, no matter how scary they are.
• The Spock: To Barnacles' Kirk and Kwazii's McCoy.
• When All You Have Is a Hammer…: Apparently, the only useful item in Peso's medical bag is a nigh-infinite supply of bandages. That said, in addition to their obvious medical use, Peso has also used them to create a handy sling, swung with them like a rope, used them to build a tent to protect from weather, and much more.

Professor Inkling

Professor Inkling Octopus

Professor Inkling in his natural habitat

Voiced in English by: Keith Wickham

Voiced in Spanish by: Ruben Gonzalez

Professor Inkling, a Dumbo Octopus, is the founder and mentor of the Octonauts. He rarely goes on missions, but his knowledge of marine biology is an asset.

• Artistic License – Marine Biology: He is an octopus with a cat-like mouth and nose.
• Bookworm: He practically lives in the Octopod's library.
• Combat Tentacles: In one episode, he used a robotic suit that causes the Octopod to mimic his movements to escape an underwater tornado.
• Invisible Parents: His parents are never seen. Considering his age, they are likely deceased.
• Let's Get Dangerous!: For the most part, Inkling prefers to just act as an academic. However, the time that a colossal squid grabbed the Octopod, he donned a remote harness that allowed him to control it and revealed that he's an expert wrestler.
• Mr. Exposition: Sharing this trait with Shellington, Inkling is frequently responsible for telling Barnacles, Kwazii, and Peso important details about the sea life that they're dealing with.
• Non-Action Guy: Inkling is not particularly strong or capable of defense outside of ink clouds, so he mostly just spends time on the bridge or in the library.
• Odd Name Out: He is the only octonaut without an alliterative name besides Tweak.
• Out of Focus: He rarely speaks or goes on missions.
• Terrestrial Sea Life: Ironically he rarely goes underwater, mostly being the library.

Dr. Shellington Sea Otter

Dr. Shellington Sea Otter

Voiced in English by: Keith Wickham

Voiced in Spanish by: Daniel Seisdedos

The team's field researcher. Shellington is always there whenever the Octonauts need information about any creature they might encounter in their adventures.

• Alliterative Name: Shellington Sea Otter.
• Animals Not to Scale: He is an otter who is taller than Barnacles the polar bear.
• Attention Deficit... Ooh, Shiny!; He can get easily distracted by some tings he's interested in.
• Bizarre Taste in Food: Had an upset stomach in "The Bowhead Whales" brought on by kelp cakes with hot sauce.
• Brainy Brunette: He has brown fur and is characterized by his intelligence.
• Butt-Monkey: Downplayed, but several episodes have made jokes at his expense.
• Catchphrase: "Jumpin' jellyfish!"
• Dr. Exposition: Sharing this trait with Inkling, Shellington is frequently responsible for telling Barnacles, Kwazii, and Peso important details about the sea life that they're dealing with.
• Ditzy Genius: Intelligent, but he can't drive a GUP and gets easily distracted by animals he finds interesting.
• Drives Like Crazy: Even Tunip can drive better than him.
• Dub Name Change:
  • Downplayed in the US dub; in the original UK version, he's often referred to as Dr. Shellington. The US version drops the "Dr." part of his name.
  • In the German dub, his name is changed to Sebastien.
• Family Theme Naming: Shellington, Pearl, and Periwinkle^note as in the common periwinkle, a type of sea snail are all named after small objects commonly found in the sea.
• Foolish Sibling, Responsible Sibling: Downplayed, of course, but he is the clumsy, dorky Foolish Sibling to Pearl's calm, organized Responsible Sibling.
• Invisible Parents: His parents are never seen.
• Ironic Allergy: He's allergic to sea urchins. Y'know, the thing his species is designed to consume.
• The Klutz: That's why he is rarely seen driving a GUP.
• Non-Standard Character Design: He has a triangular snout in place of the standard Playful Cat Smile-esque muzzle.
• Odd Name Out: He's the only member of his known family whose name doesn't start with the letter P.
• Ooh, Me Accent's Slipping: Occasionally, his Scottish accent will fumble into an American accent.
• Playful Cat Smile: Fitting with his goofy personality, his mouth is in the shape of a 3. It appears to be a species trait.
• Playful Otter: He's playful with the Vegimals.
• Repeating So the Audience Can Hear Tunip's Vegimalese.
• The Smart Guy: When the Octonauts need information for any kind of creature, he is the go-to guy.
• Translator Buddy: To Tunip and the other vegimals.
• Tuft of Head Fur: He has some spiky bangs on his head.
• Verbal Tic: "Fascinating" seems to be his favourite word.
• Voice with an Internet Connection: In most episodes, Shellington stays in his lab and relays information about the sea life that others (usually Barnacles, Kwazii, and/or Peso) are encountering outside the Octopod via the radio.
• Why Did It Have to Be Snakes?: "The Pelicans" implies he is afraid of heights.

Tweak Bunny

Tweak Bunny

Voiced in English by: Jo Wyatt, Jaimie Kelton (US version, season 1 only)

Voiced in Finnish by: Heljä Heikkinen

Voiced in Spanish by: Vanesa Silva

Tweak is the team's engineer, dedicated to work on special devices to help the Octonauts in their missions or maintain the Octonauts. She is very fond of eating carrots.

• Action Girl: A very active and tomboyish bunny that is ready for action.
• Amazing Technicolor Wildlife: A green rabbit.
• Catchphrase "Faster than you can say 'Buncha munchy crunchy carrots!'", and in later seasons, "Oh me, oh my!"
• Childhood Friends: With Sandy the Sea Turtle.
• Dub Name Change:
  • In the Finnish dub, she is named Viivi.
  • She is Perita in the Spanish dubs.
  • She is Trixie in the German dub.
• The Engineer: She doesn't just design all of the machinery the Octonauts use, but she's also the one who builds and maintains it all, as well.
• Expressive Ears: They twist when she is stressed, mostly in early episodes.
• Girly Girl And Tomboy: Tweak is the Wrench Wench tomboy to Dashi's Communications Officer Girly Girl.
• Odd Name Out: She doesn't have an alliterative name like most of the others.
• Punny Name: Her name is Tweak, and she's a mechanic.
• Missing Mom: Her mother is never seen.
• The Smart Girl: Knows a whole lot about tech, GUPs, or just anything to do with building.
• Southern-Fried Genius: The genius part (being both the designer and builder of all the GUPs) is established from the beginning, and the fourth season reveals that she's originally from the Everglades in Florida.
• Tomboy with a Girly Streak: Tweak is usually tomboyish compared to Dashi, but wears a pink headband.
• Stock Animal Diet: As already mentioned, she is very fond of her carrots.
• Tuft of Head Fur: Complimenting her tomboyish nature.

Dashi Dog

Dashi Dachshund

Voiced in English by: Teresa Gallagher (UK version), Mary Murphy (US version, Seasons 1-4), Jenny Yokobori (US version, The Caves of Sac Actun onwards and Above and Beyond)

Voiced in Spanish by: Tamara Ferj

The Octonauts' information officer. Dashi is entrusted with maintaining and controlling the Octopod's computers. She also provides information to the Octonauts in the field. Dashi is a very good photographer and has a collection of cameras and pictures.

• Action Girl: A very girly dog that can also be active when on a mission.
• Adaptation Name Change: In the original books, she was named Sauci.
• Alliterative Name: Dashi Dachshund (UK), Dashi Dog (US).
• Communications Officer: In contrast with Tweak, Dashi is the expert at software and radio communications, and she's frequently shown to be coordinating their radios.
• Damsel out of Distress:
  • While waiting to be rescued from a whale shark's stomach, passes the time by taking interesting photos. No distress here.
  • Calls for help... lifting a large creature back into the river where it belongs.
• Dub Name Change:
  • The US version changes her surname to Dog.
  • Her name is Dana in German.
• Girly Girl And Tomboy: The pink-skirted Girly Girl to Tweak's shorttank tomboy.
• Girly Girl with a Tomboy Streak: Dashi is the definitely the fashionable girly female main character in comparison to the tomboyish mechanic, Tweak Bunny. However, Dashi can be very active when on a mission.
• Intrepid Reporter: Just watch her report the Iron Clam Competition.
• Invisible Parents: Her parents are never seen.
• Nice Girl: Is very sweet and kind.

Tunip the Vegimal

Tunip the Vegimal

Voiced by: Michael C. Murphy

Tunip is half-vegetable, half-animal creature that serves as the Octopod's cook and gardener. He and his fellow Vegimals are usually seen working to prepare meals for the Octonauts.

• Badass Adorable: He used to be just The Cutie, but became a badass in "The Very Vegimal Christmas".
• Catchphrase: "Cheepa Cheepa!" when excited.
• Dub Name Change: He is Victor in the Spanish dubs.
• Daddy's Boy: Shellington loves all his fellow Vegimals, but is particularly close to Tunip.
• Fainting: You know that something bad happens whenever Tunip faints.
• Genius Ditz: Him and most of the other vegimals are kinda ditzy at times, but they are excellent chefs. Plus in "The Very Vegimal Christmas" he and the Vegimals invented a new GUP.
• Hive Mind: One of the books implies that the Vegimals are this, and have appointed Tunip as their spokesperson.
• Intelligible Unintelligible: Shellington understands him.
• Planimal: Like all Vegimals.
• Speaking Simlish: It's vaguely similar to English (such that there's usually a word or two that can be picked out and the meaning can be gleaned even when Shellington is absent), but most of Tunip's dialogue (along with the other Vegimals) is just random babble.
• Straight Man: Occasionally, whenever Shellington is being more "ditz" than "genius".
• Supreme Chef: His fish biscuits are apparently the best food in the entire ocean to the extent that, regardless of their usual diet, any sea creature that eats them finds them irresistible. The only exception to this were the lionfish, and even then the problem was just that they had been eating them for days.
• Took a Level in Badass: In "The Very Vegimal Christmas", Tunip and the Vegimals build a new GUP and use it to save the Octonauts from danger.
• The Unintelligible: To anyone who isn't Shellington.

Family members

Bianca

Voiced by: ???

Bianca is Captain Barnacles's twin sister.

• Alliterative Family: Bianca and Barnacles Bear.
• Meaningful Name: Bianca is an Italian name that means "white", so it's a suitable name for a polar bear.
• Pink Girl, Blue Boy: She wears cerise-pink while her brother wears Octonaut-blue.
• Tuft of Head Fur: It sticks more sideways as opposed to her brother's sticking up.
• Vague Age: It's unknown if she is Barnacles' older or younger twin.

Orson and Ursa

Voiced by: ???

Orson and Ursa are Bianca's cubs, and Captain Barnacles's nephew and niece.

• Inprobable Hairstyle: Ursa's ponytail sticks upward all the time.
• Tomboyish Ponytail: Ursa is energetic and brash and has a ponytail sticking upwards
• Tuft Of Headfur: Orson has this.
• Vague Age: They are referred to as cubs, and their debut episode marks their first time leaving the den, but they look and act similar to human eight year olds.

Calico Jack

Voiced by: Rob Rackstraw

Calico Jack is Kwazii's grandfather, a legendary pirate.

• Unseen No More: After only being spoken about through stories for the entirety of Season 1, he finally made an in-person appearance in the Season 2 special "The Amazon Adventure".

Pinto

Voiced in English by: Jo Wyatt (UK), Jaimie Kelton (US)
Voiced in Spanish by: Consuelo Pizarro

Pinto is Peso's little brother.

• Borrowed Catchphrase: Downplayed: in one episode, he says his own variation of Kwazii's catchphrase; "Shiver me flippers!".
• Keet: He takes after Kwazii's energy much more than Peso's timidity.
• Vocal Evolution: He no longer has his accent in the US version of Above and Beyond.

Pearl

Voiced by: ???

Pearl is Shellington's older sister.

• Action Mom: When she became an Octo-Agent in Above and Beyond, she became much more action-oriented while still being a good mother to Periwinkle.

Periwinkle

Voiced by: ???

Periwinkle is Pearl's son.

• In-Series Nickname: Often called Peri.
• Plot-Relevant Age-Up: When he first appeared, he was a newborn pup. Later episodes, as well as Above and Beyond, age him up to be closer in age to Pinto, so he can attend Otter Scouts while Pearl is busy being an Octo-Agent.

Koshi

Voiced by: Teresa Gallagher (UK), Mary Murphy (US, Season 4), ??? (US, Above and Beyond)

Koshi is Dashi's younger sister.

• Bookworm: Her primary trait is her love of books.
• Ears as Hair: Her ears resemble pigtails.

Ranger Marsh

Voiced by: ???

Ranger Marsh is Tweak's father.

Friends

Tracker

Voiced by: Paul Panting

Tracker is a Polar Scout.

• Vague Age: He appears to be in his mid-twenties, but a flashback in The Caves of Sac Actun implies he is around the same age as Barnacles.

Ryla

Voiced by: Helen Walsh

Ryla is a wombat who's an old friend of Dashi's.

• Nonstandard Character Design: She has prominent buckteeth, a rare trait in this series.
• Pink Means Feminine: She wears pink.

Paani

A macaque monkey from India who is one of the Octo-Agents.

• Canon Foreigner: He was introduced in the spinoff.
• Informed Species: He doesn't look like a real macaque, instead looking like a generic brown monkey with a tan face and having a muzzle looking like that of Kwazii the cat.

Sea creatures^note Alphabetical order

Boris

Voiced by: Simon Greenall

Boris is a narwhal.

Dina

Voiced by: ???

Dina is a sardine.

Hank

Voiced by: ???

Hank is a humuhumunukunukuapua'a fish.

• Alliterative Name: Hank the humuhumu.

Jelly

Voiced by: ???

Jelly is a comb jelly.

• A Dog Named "Dog": A comb jelly named Jelly.
• Keet: Very energetic, even in the face of danger.
• You No Take Candle: Does not speak in full, grammatical sentences.

Lemmy

Voiced by: ??? (UK), Wayne Grayson (US)

Lemmy is a lemon shark.

• Alliterative Name: Lemmy the lemon shark.
• Surfer Dude: Has a voice like this in the US.

Louie and Lily

Voiced by: ???

Louie and Lily are a pair of lionfish.

• Alliterative Family: Louie and Lily Lionfish.

Manatees

Voiced by: Teresa Gallagher (one), ??? (others)

The manatees are a herd of relaxed manatees.

• Mellow Fellow: As part of the groups vibe all the Manatees are presented as this being chill and relaxed happy to go with the flow.
• Ooh, Me Accent's Slipping: One of them slips from her American accent into a British accent when asking Barnacles to hurry.
• Surfer Dude: How the Manatees talk uses lots of Surfer slang and portrays them as surfer sterotypes.

Puffy

Voiced by: ???

Puffy is a pufferfish.

• A Lizard Named "Liz": A pufferfish named Puffy.
• Distressed Dude: In his episode, he has to be rescued from a whale shark's stomach.
• Nervous Wreck: He's very jittery.

Remipedes

Voiced by: ???

The remipedes are a group of remipedes.

• Deadpan Snarker: Their leader has a very dry, nonchalant reaction towards Shellington's antics.

Sandy

Voiced by: ???

Sandy is a leatherback sea turtle.

• Childhood Friends: With Tweak.

Slippy

Voiced by: ???

Slippy is a snot sea cucumber.

• Alliterative Name: Slippy the snot sea cucumber.
• Damsel in Distress: Slippy always seems to be in some sort of peril. First she has to be treated for an injury after an undersea tremor, then the Octopod must be flooded so she can breathe.
• Meaningful Name: She is named for how slippery she is.
• Pink Means Feminine: A pink female sea cucumber.

Sonny and Janis

Voiced by: ???

Sonny and Janis are a seahorse couple.

• Happily Married: They are one of the most lovey couples shown in the series.
• Mister Seahorse: Literally; their episode has Sonny give birth to their babies.

Sunny

Voiced by: ???

Sunny is a sunfish.

• Alliterative Name: Sunny the Sunfish.

Twinkle

Voiced by: ??? (UK), Jaimie Kelton (US)

Twinkle is a sea star from the Midnight Zone.

• Children Are Innocent: She's an innocent little sea star who just wants to go home.
• Daddy's Girl: Implied; when she is returned home, she hugs her dad first.
• I Thought Everyone Could Do That: When the Octonauts take her into the Midnight Zone, they're surprised to see that she glows in the dark. She says, "Doesn't everybody glow in the dark?"

Whale shark

Voiced by:

The whale shark is a recurring character.

• The Nameless: He is not named.