Gengoro Hiraga, grandfather to Toshio Hiraga, claims descent from the pioneering Japanese electricians of the 1970s and 1980s, a period celebrated for breakthroughs in appliances like microwaves and refrigerators; his surname itself pays tribute to these figures. He possesses gray hair combed backward, a white beard, and black eyes. His signature attire is a white suit, green tie, brown pants, and black shoes. Gengoro presents a jovial front, yet underlying this cheerfulness are distinct traits of obstinacy, pushiness, and irascibility. This volatile nature manifests in his persistent, though perpetually unsuccessful, attempts to confront and defeat Gauko. His demonstrated abilities include creating objects that defy conventional physical laws and positioning himself in physically impossible locations.