**Kinro** A young guard of Ishigami Village (born circa 5721 AD), Kinro is the muscular, slightly above-average height son of Tetsuken and Shirogane, and elder brother of Ginro. He possesses brown hair, green eyes, a distinctive scar on his right cheek, and a lock of long hair falling between his eyes. His stern expression, partly due to nearsightedness later corrected with glasses, matches his personality. He typically wears a sleeveless royal blue karate gi-like uniform secured with a rope belt and carries a buckler marked with the village's star pattern. After key events, he adopts glasses for vision and briefly wields a katana before returning to his signature spear; he later wears modern clothing following the establishment of Yuzuriha's fashion store. His character centers on an unwavering, stern adherence to rules, encapsulated by his motto, "Rules are rules." He demonstrates fierce discipline and disdain for laziness or cheating, opposing even rigging village games to cure Ruri. He initially bars Senku from the village despite being saved and rejects inventions like ramen, though hypocritically accepts a gold-gilded spear bribe. Pride leads him to conceal his vision impairment, hindering his combat. Despite this rigidity, he shows deep loyalty, protecting villagers and sacrificing himself during Hyoga's raid by ordering Ginro to collapse a bridge while he stayed behind. He acts as Ginro's moral compass, chastising his frivolity. Over time, he overcomes stubbornness, joining Senku's literacy school after initially dismissing arithmetic as impractical. Kinro first appears blocking Kohaku and Senku at the village entrance, invoking anti-outsider rules. Senku bribes him by gold-plating his spearhead, creating a strong attachment. When Kohaku destroys the spear during an experiment, Gen manipulates Kinro into powering a generator by promising repairs. During the village leadership tournament, he fights Magma despite impaired vision; borrowing Suika's lens-equipped helmet allows him to gain the upper hand until the lenses break. He later receives permanent glasses. After Senku wins chief status, Kinro vouches for his integrity, convincing skeptical villagers. In the conflict against Hyoga's forces, he guards a bridge and battles Hyoga, sustaining severe injuries yet insists on immediate return to duty. He aids evacuations when the village burns and later helps construct communication devices like the cotton candy machine. During the Age of Exploration, he joins expeditions on the Perseus. On Treasure Island, he faces petrification but is later revived. His abilities include expert spearmanship with a buckler and proficiency with a katana during Hyoga's raid. His physical prowess ranks among Ishigami Village's strongest, rivaling Magma and Kohaku. Corrected vision significantly amplifies his strength, enabling him to defeat Magma. He possesses enhanced stamina, enduring prolonged generator cranking and Magma's assaults. His stats rate power at 3/5, speed 2/5, technique 3/5, and reach 4/5. Kinro's development shows evolution from rigid traditionalist to adaptable Kingdom of Science member. He transitions from distrusting Senku's methods to embracing science, evidenced by adopting glasses and advocating for literacy. His loyalty shifts from blind rule-following to principled support for Senku's vision, balancing duty with newfound trust in scientific progress.