Genos, designated Demon Cyborg, is a 19-year-old S-Class hero with a mechanized body forged from tragedy. At 15, his family and hometown were obliterated by a rogue cyborg, leaving him the sole survivor. Rescued and rebuilt into a full-body cyborg by Dr. Kuseno—a scientist tracking the same threat—Genos dedicated his existence to avenging his family by hunting the Mad Cyborg. For years, he has combated monsters and dismantled criminal syndicates while seeking clues to his target’s whereabouts. His mechanical frame features synthetic facial skin, spiky blond hair, and piercing yellow irises set against black sclera. Enhanced strength allows him to pulverize cliffs and hurl vehicles, while supersonic speed and nuclear core-powered endurance negate conventional fatigue. Though impervious to pain, his armor falters against corrosive agents. Iterative upgrades by Dr. Kuseno have equipped him with rocket thrusters, modular limbs, and Incineration Cannons capable of precision strikes or catastrophic blasts. A chest-mounted nuclear core sustains his systems and preserves data even during total destruction. Once ruthlessly focused on vengeance, Genos adopted measured tactics and emotional restraint under Saitama’s mentorship. He idolizes the hero, meticulously studying his methods and fiercely shielding him from detractors or dangers. While collaborating with Dr. Kuseno as both partner and surrogate son, Genos occasionally prioritizes revenge over the scientist’s counsel. Critical battles shaped his evolution: a near-fatal clash with Mosquito Girl cemented his allegiance to Saitama; engagements against Carnage Kabuto and Deep Sea King revealed strategic adaptability; a skirmish with Elder Centipede during the Monster Association raid demonstrated tactical growth despite catastrophic damage. A timeline reset via Saitama’s intervention spared him from Garou’s lethal core extraction, preserving memories of the erased future. Following Dr. Kuseno’s assassination by Neo Heroes-linked robots, Genos inherited a final upgrade amplifying his combat prowess. His current investigations into Bofoi and the Neo Heroes intertwine with unresolved threads linking his past to the Mad Cyborg. Though fueled by organic matter conversion, Genos occasionally indulges in human pastimes like competitive eating. His curiosity about emotion-driven concepts like “fun” reflects Saitama’s subtle influence on his evolving perspective, bridging his mechanical precision with glimpses of humanity.