Kōsuke Entōji is the chief engineer of the Gutsy Galaxy Guard, or GGG, a technologically brilliant mind who oversees the development, maintenance, and strategic enhancement of the organization's super-mechanoids, including GaoGaiGar and its successors. Possessing an estimated IQ well above three hundred, he is responsible for designing the Z Sensor, a detection device that identifies Zonder Metal by its unique particle emissions, and later updates it for broader applications. Entōji also builds and maintains GGG’s central computer security systems, and his analytical skills make him a key figure in assessing enemy capabilities and formulating battle plans. Despite his high intellect, he is grounded and deeply loyal to his team. His most significant bond is with the ninja robot Volfogg, who was originally created from a memento of a deceased partner, and Entōji shares a strong emotional tie with him, once openly weeping when Volfogg appeared to be destroyed. In the events chronicled in Brave King GaoGaiGar Final Grand Glorious Gathering, Entōji continues to serve at GGG headquarters, coordinating technical support and intelligence analysis as the team confronts new threats such as BioNet and the Eleven Planetary Masters of Sol. His role is primarily supportive, providing the essential technological backbone that enables the frontline heroes to fight effectively. Through the crisis, he remains steady and resourceful, reflecting the quiet courage of those who work behind the scenes.