Peso Penguin is the medical officer of the Octonauts. He is a kind-hearted penguin from a large family who likes to help any injured sea creature. He is very shy and gets scared easily by Kwazii's spooky stories, but he can be brave when there is someone who needs his help. He has a little brother named Pinto who thinks he is a real hero and Pinto has even been to visit him a few times at the Octopod.
Peso is often the first to show fear when a mission involves any kind of danger, but he has shown that he is very capable of pulling through even the most stressful situations.
He's a talented medic, often gaining the trust of injured or frightened sea creatures far easier than his other crew mates due to his gentle personality and he's able to bandage them up even quicker. And somtimes he gives the underwater creature a sticker.
Like Captain Barnacles, Peso also has love for a specific kind of instrument. For him, it's the xylophone and he plays it rather well, Peso's music in "The Octonauts and The Beluga Whales" he plays the same song as the beluga whale song. In the original UK version of the show, Peso has a very mild British accent and his brother Pinto has a much stronger one. In the US version of the show, they were both given more Hispanic accents instead. Peso Penguin is the medic member of the Octonauts. He is usually seen trying to help take care of the auatic creatures' medical needs.
Black and white with a medical hat. And often seen carrying around his favorite medical bag.
- Deep-Sea Suit
- Suction Cup Suit
- Inside-Out Suit
- Snow Suit (despite being a cold-adapted animal)
When Captain Barnacles calls Octo Alert he usually found in his Medic room. For the launch pad he is usually with Barnacles and Kwazii running in the hallway to the launch pad.
- "Flappity flippers!"
- "When a sea creature is sick, I'm there."
- "I help any creature who is sick or hurt, no matter what."
- "I am here to help you feel better!"
- "Good as new!"
- "You need a bandage."
- "Ha, Cha, Hoy, Yah!" (When bandaging, unbandaging or untangling tentacles.)
- "Just doing my job."
- "Dorian? Is that you?" (The Immortal Jellyfish)
- "OOOH, Claws of DANGER!!" (The Mantis Shrimp)
- "This place gives me the creeps." (The Octopod Mystery)
- "AAH! Snake! Snake on the octopod!" (Octonauts and the Sea Snakes)
- "I...I can't believe I just did that!"
- Vampire Squid
- Boo the Spookfish
- Slippy the Snot Sea Cucumber
- Leon the Elephant Seal
- Jelly the Comb Jelly
- Twinkle the Sea Star
- Sonny and Janis the Seahorses
- Lemmy the Lemon Shark
- Puffy the Porcupine Puffer
- Pinto - Little Brother
- Rocko - Cousin
- Pogo - Big Brother
- Aunt Papita (mention)
- Grandma Perdita (mention)
- Uncle Pepe (mention)
- Piñata -Sister (mention)
- Petina -Cousin (mention)