Toshio Hiraga, grandson of the eccentric inventor Gengoro Hiraga, inherits a legacy intertwined with machines that defy conventional physics. Gengoro’s most formidable creation, the towering Mecha Toshio—alternately dubbed Toshio-Bot—was originally commanded by Toshio himself as part of a calculated strategy to target Gauko’s vulnerabilities. However, control of the mechanized giant shifted abruptly to Gengoro after pivotal events, culminating in a clash where the inventor’s own physical frailty during the skirmish caused a critical injury to his back, enabling Gauko’s triumph. Designed as Gauko’s ultimate destroyer, the robot’s failure stemmed directly from Gengoro’s compromised stamina in the heat of battle. Toshio’s personal history and individual growth beyond this conflict are not elaborated upon in existing records, with no documented exploration of his relationships, driving motivations, or overarching narrative trajectory across official media.