Ginro, a descendant of petrified astronauts, hails from Ishigami Village and serves as a guard alongside his older brother Kinro, though he habitually evades duties and labor. Relatively short with an androgynous appearance, he has medium-length blond hair covering one side of his face, round green eyes, and soft features—traits enabling convincing female disguises, notably during infiltration of the Petrification Kingdom. His standard blue karate gi-like uniform accompanies his primary weapon: initially a spear, later replaced by a steel katana. Profoundly cowardly and self-serving, Ginro openly fears poison gas, insects, and combat, prioritizing self-preservation—exemplified when he faked swimming after the Perseus ship to impress village girls rather than boarding its perilous voyage. He neglects guard assignments and protests contributing to scientific labor, yet celebrates labor-saving inventions like automated generators. Easily distracted by shiny objects or Senku’s gadgets, he inadvertently participates in Kingdom of Science schemes. His perverse tendencies include romantic fantasies about village women and attempting to misuse an X-ray device to see under clothing. Beneath these flaws, Ginro harbors sincerity and protectiveness. He openly admits fears, contrasting those who mask vulnerabilities, and urges Kinro to reveal his nearsightedness to avoid unfair blame. He risks his life collecting sulfuric acid from toxic springs for Senku and Chrome. When Kinro dangles wounded from a bridge during Hyoga’s invasion, Ginro refuses to sever it despite tactical necessity. With Suika’s aid, he overcomes terror to shield Kinro from petrification. He comforts Ruri during village games, assuring her of Chrome’s victory—though ambition later overshadows this kindness. Trials gradually forge Ginro’s courage. Fleeing initially during the sulfuric acid mission, he returns to rescue Chrome from falling into lethal springs, demonstrating composure. He defeats the formidable Argo in the village tournament using Senku’s placebo "energy drink" and willpower, but abandons protecting Ruri to pursue power. Disguised as a woman infiltrating the Petrification Kingdom, he smuggles ethyl acetate in a pineapple to subdue enemies and earns a warrior’s loyalty by resembling their late master. Critically wounded by Ibara, he delivers vital intelligence before Kohaku saves him. These experiences temper his cowardice, revealing latent self-sacrifice. In combat, Ginro favors agility and psychological tactics over strength. His spear technique features flashy feints and performative flourishes like a spearman’s dance during disguises. Endurance lets him withstand punishment, evidenced against Argo and during grueling generator-cranking with Kinro. Equipment adapts to his roles: a silver-plated spear darkens to detect toxic gas, while the ethyl acetate pineapple acts as a concealed chemical weapon. Though not elite, his skills suffice for critical missions when resolve ignites.