Boss begins as a school bully and rival to Koji Kabuto, later becoming his steadfast ally. Alongside gang members Nuke and Mucha, he delivers comic relief while actively aiding the protagonists. He conducts reconnaissance missions via motorcycle to gather enemy intelligence. His evolution peaks when he constructs the mechanically crude Boss Borot robot from salvaged materials in an abandoned warehouse. This robot, occasionally effective despite frequent weapon deficiencies, participates in battles and mirrors Boss’s emotions through facial transformations. In "Mazinger Z Vs. Dr. Hell", a storm at the beach triggers Boss’s prophetic vision of global annihilation by the Great General of Darkness, igniting the plot. During the Mikene Empire’s assault on the Photonic Research Institute, Boss pilots Boss Borot alongside Diana A for defense. Their efforts fail against Warrior Beasts, resulting in the lab’s destruction. This collapse critically injures Shiro Kabuto, trapped while retrieving Koji’s forgotten birthday gift. Boss maintains a deep friendship with Sayaka Yumi and harbors unrequited feelings for her. Later, similar affections for Jun Hono spark tensions with Tetsuya Tsurugi. His loyalty to Koji endures, supporting him even when weakened after donating blood to Shiro. In one battle intervention, Diana A’s missiles accidentally launch Boss Borot into combat, destroying the Warrior Beast Dante. Despite his comedic role, Boss displays unexpected combat aptitude. Nuke occasionally exhibits drunken fist kung fu skills, while Mucha wields spiked metal balls with precision. The Boss Borot appears across series like Grendizer and Mazinkaiser, retaining its improvised design and erratic functionality. Boss consistently embodies loyalty and humor, occasionally revealing deeper competence—particularly when protecting characters like Shiro and later Bakarasu in Great Mazinger.