Bumbuku is the father of Ponko and Fuguri, and the husband to Mami, within a family of tanuki aliens who become guests at the hotel. His background is rooted in a large-scale territorial dispute that broke out on his home world, the Tanuki planet. In an effort to keep his family safe and find a better place to live, he made the courageous decision to leave their home and lead them on a journey into space.

His personality is often described as being slightly suspicious or shady, yet this quality makes him a lovable and memorable character. Bumbuku is prone to getting carried away with his own confidence, and his tendency to show off or exaggerate his own talents is a notable weakness. Despite this flaw, he is fundamentally a caring father whose primary concern is the well-being and security of his loved ones.

His primary motivation is his family. The entire space voyage was undertaken to protect them from danger, and their safety continues to be his highest priority. In the story, he arrives at the hotel alongside his family, becoming part of a new dynamic as the robot staff learns to accommodate non-human guests. Within the family unit, he plays the role of the father, interacting with his wife Mami, his children Ponko and Fuguri, and the grandmother, Mujina. In group settings, he has shown a degree of caution, preferring to avoid conflict or uncomfortable situations.

While Bumbuku lacks confidence in his physical strength, he possesses extensive knowledge and skill in mechanics and engineering. He is highly proficient with machines and technology, and his technical abilities are advanced enough for him to construct a spaceship with his own hands, a feat that enables his family's interstellar travel. This expertise is a central part of his identity and becomes a key asset for the family during their adventures.