Bunta Hayami is an 18-year-old member of the Combat Force aboard the Daikyu Maryu. He serves as the pilot of the fish-dragon mecha known as the Nessar. As a member of the team, his primary function involves operating his assigned vehicle in battle and supporting the overall mission to defend Earth from the Dark Horror Army.

In terms of personality, Bunta is characterized as a gentle, cheerful, and calm individual who acts as a mood-maker within the group. Despite his large physique, he has a surprisingly sensitive and delicate nature. He is also notably polite, speaking with formal language to everyone he encounters, which underscores his respectful demeanor.

A notable ability of Bunta is his proficiency in free diving. He is an accomplished skin diver capable of holding his breath and diving to depths of up to one hundred meters, a skill that likely aids in his piloting of the aquatic Nessar. Information regarding his specific background before joining the crew, his individual motivations, detailed character development throughout the series, and his key relationships with other characters besides being a team member is not available.