Peso Penguin

"Well, do I mention that there's Peso the penguin? Well, this guy looks so cute and sensitive, which makes sense right? Well, this penguin is a good medic to me, like McStuffins."

--Su Ji-Hoon, The Octonauts and the Great War

Peso Penguin is the medical officer for the Octonauts. He is a small, 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 is smaller than him. Pinto has even been to visit him a few times at the Octopod. He is one of the second smallest in the Octonauts crew.

In When the Cold Breeze Blows Away, he serves as a medic of the Octonauts, which is both part of the Future Alliance and the Sonic Alliance.