Kinro, the elder of the guard brothers of Ishigami Village. An adult and a spearman who has diligently honed his skills to protect the village. However, he has never learned the formal Kan-ryu spearmanship used by Hyoga and others. He relies solely on the spearmanship taught within the village, learning only how to handle the spear aggressively as best he can. Basically, he has a very diligent and rule-abiding personality. He is so stubborn and inflexible that his catchphrase is "Rules are rules," and he is honest enough to accept things even when they are disadvantageous to him. He also has a compassionate side, but due to his strict nature toward himself, his tendency to force sacrifices upon himself is particularly prominent. He speaks in a formal, blunt manner. Since he was born after the world was petrified, he is fundamentally unfamiliar with and flustered by science. He has the image of a naive country youth. He has severe nearsightedness. He wears glasses made by Senku and Suika, but even without them, his impression just becomes a bit fiercer; it doesn't pose a major problem in daily life. He once considered this a weakness, but he overcame it through his glasses. Black hair, slightly long bangs falling over the bridge of his nose, green eyes, rectangular half-rim glasses, tall, a well-balanced muscular body, and large hands. His outfit mainly consists of navy blue cloth clothes with ropes tied around his shoulders to keep his sleeves from slipping. He is unaware of his feelings for Guest. He is a man who is clueless and stiff when it comes to love. It's not that he lacks interest in or resistance to women, but he is a complete novice regarding romance.

Akatsuki Hyoga. An adult spearman who uses the Owari Kan-ryu style, a technique difficult for anyone to emulate. As one who has formally mastered it, he is a warrior who shows his most powerful side when holding his primary weapon, the spear. He has a calm and cold personality and believes in eugenics devoid of ethics. Based on this, he tends to highly value people who are exceptionally capable or know how to fulfill their responsibilities, calling them "diligent" or "proper people." On the other hand, when he encounters someone he deems useless, he doesn't hesitate to use mild insults like "Your brain has melted." He uses polite language consistently. There is never a moment he doesn't use honorifics. Unless the opponent threatens him first, he doesn't beat them excessively... but his drawback is that he calmly loses his mind when a line is crossed. White hair, and his eyes are a deep navy blue close to black. He wears a fur cape and leather cloth connected to a mask that covers his mouth, and he is tall. Like a spearman, his physique is sturdy but long and graceful. Born before the world was petrified, he seized the opportunity in the Stone World to originally select and save only a few based on eugenics. However, he was partially convinced by Ishigami Senku and quietly became a member of the Kingdom of Science. He later realized he likes Guest and has no intention of hiding it. The way he follows her around is exactly like a cat, but everyone pretends not to notice. He usually manipulates situations so that no one else can approach Guest.

Ginro, the younger of the guard brothers of Ishigami Village. Kinro's younger brother and a spearman... or rather, just a spear-wielder. He is cunning, preoccupied with his own safety, and likes to leave things to others or cling to them. He is a comic relief character, slightly mean-spirited, but a loyal man who does his job properly when it counts. Since he was born after the world was petrified, he is fundamentally unfamiliar with and flustered by science. Yellow bobbed hair, green eyes, a gentle eye shape, shorter than average height, and a slightly thin body. He knows how to perform a spear dance, but it's said to be for the purpose of distracting the enemy and running away. Ginro does not appear too frequently.