Captain Blubber is a sea hippo who owns the ship: The Salty Hippo. In Banjo-Kazooie, he lost his treasure and needed Banjo and Kazooie to go find it for him. There are only 2 pieces of treasure which can be found inside the ship. 1 of the pieces is in the front part of the boat, which can be entered by the little pool. There will be an open area, swim through that and collect the treasure. The other piece of treasure is in the back part of the boat, to get in there, you must beak barge a small wooden box-like thing. At the end of the 1st game, Captain Blubber is seen riding a wave racer into the sunset.
In Banjo-Tooie, Captain Blubber owns a shop that is located in Jolly Roger's Lagoon. Captain Blubber gives Banjo and Kazooie a pair of Turbo Trainers for 1 doubloon. Once you give him is doubloon, he runs out of the shop, leaving a Shock Jump Pad unguarded, so that you can get the Jinjo in the rafters. With the Turbo Trainers, you can get the Jinjo that is located across the lagoon, in a little alcove. At the end of Banjo-Tooie, Captain Blubber is seen riding the Saucer of Peril into the sky above Cauldron Keep.