Introduced in Bubble Bobble Double Shot on DS, Bubu is a Cousin of Bub and Bob who lives with Grandpa. He is only seen in his bubble dragon form just like Grandpa. His bubbles are red and along side Bub and Bob's bubbles make a 'RGB combo' which is used to defeat certain enemies of many colors. He lives on Chack'n Island in a small house with Grandpa. The attic in said house contains a treasure map, and along side Bub and Bob go to find the treasure!