Drumbunker Dragon

Known simply as "Drum" by Gao, Drum is a stubborn Dragon from Dragon World, who is the son of Fang Slade Terrestrial XIII, the chief of the Drum Clan. Drum always works hard to be recognized by his father, who seems to always be unimpressed with Drum. Drum is always fighting with Gao over small things like food such as his favorite food, pudding. Though they fight a lot, Drum seems to eventually respect Gao, even to the point where he leaves to train so that he can be of more use to Gao. He comes back eventually being able to use different kinds of worlds other than Dragon World as a result of his training.

(Source: Future Card Buddyfight Wikia)