Information about Inspector Belbo from Kyōfu Densetsu Kaiki! Frankenstein is extremely limited. Based on available sources, the character appears in the 1981 anime television film, where he is referred to as Inspector Bellbeau. He investigates a series of mysterious mutilation killings that occur in a village in 1860, which are linked to the creature created by Victor Frankenstein. His primary role in the story is as a representative of law enforcement pursuing the monster. At the climax of the film, Inspector Bellbeau and his police force confront the monster and open fire on him in the mountains. After the creature commits suicide by throwing himself off a cliff and Victor Frankenstein takes his own life, Inspector Bellbeau is present at the monster's grave as a final scene concludes the narrative.

No information is available regarding the character's background, personality, motivations, key relationships with other characters beyond his official duty, any personal development throughout the story, or any notable abilities he might possess.