Barnacles Bear

"Oh look. It's Captain Barnacles. He's a great leader of the Octonauts. This cuddly bear couldn't get better if this war would be violent... and yet again, Barnacles is the one who leads the way of the Octonauts."

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

Barnacles Bear is the captain of the Octonauts and one of the bravest polar bears you will ever meet. He is one of the strongest of the staff. Always the first to rush in and help when there's a problem, the crew has great respect for him.

In When the Cold Breeze Blows Away, despite being the leader of the Octonauts, which it is part of the Future Alliance and the Sonic Alliance, he is being bossed around by both Miles Callisto and Sonic the Hedgehog.