Gyoraiman is a torpedo-themed assassin robot created by the criminal organization BAD, appearing as the primary antagonist of the nineteenth episode of the tokusatsu series Robot Keiji. Its design and name are derived from the torpedo weapon, reflecting a specialization in aquatic or explosive combat. Its background as a BAD-made robot places it among the many weaponized machines that the organization deploys to carry out its large-scale criminal schemes. In the story, Gyoraiman is contracted by a secret society known as Zero to assist in a plot to bomb Tokyo with a hydrogen bomb. Its specific assignment is to guard another BAD-built android, a human-like robot whose role is central to the plan. As a result, Gyoraiman acts as both a protector and an enforcer, standing in direct opposition to the robot detective K and the police investigation. Although its appearance is limited to a single episode, its function is that of a single-purpose, mission-driven weapon. It shows no signs of independent personality or emotional depth; its motivations are purely those of a loyal tool of BAD, carrying out orders without hesitation or deviation. Gyoraiman possesses physical abilities appropriate to its torpedo theme, likely including underwater mobility, enhanced strength, and projectile weaponry, though specific abilities are not elaborated upon in available documentation. The robot interacts with other BAD robots and agents during the operation, but no meaningful personal relationships or character development occur, as it is ultimately defeated by K before its mission can be completed. Its role serves to illustrate the variety of specialized assassin robots employed by BAD and to heighten the stakes of a particular episode’s narrative.