When during the village tournament he uses glasses made by Senku to defeat Magma, he forfeits the match, feeling as though he unfairly cheated. Though initially suspicious of Senku, he becomes a loyal member of the Kingdom of Science, vouching for Senku to the rest of the village. Despite his serious temperament, Kinro often acts emotionally. Senku successfully bribes Kinro into letting him pass by gilding his spearhead; afterwards, Kinro shows a strong emotional attachment to the spear. He often gets annoyed and worn out by Senku's experiments at his expense. After Senku creates a generator that eases his work, Kinro is excited despite his normal disdain for laziness. Prideful to a fault, he refuses to disclose his "blurry eye disease" even though it puts him at a severe disadvantage in combat. After being frightened by Senku's soap bubbles, he claims that he was merely reactly cautiously to the unknown. As a member of the Kingdom of Science, he learns to overcome some of his stubbornness. Initially dismissing arithmetic as unnecessary and impractical for combat, he is quick to join Senku's literacy school, telling Ginro that learning to write is an increasingly important part of communication. Kinro is one of the physically strongest members of Ishigami Village, rivaled only by Magma and Kohaku. Kinro wields a spear and a buckler. For a time, the spearhead was gilded (as a bribe from Senku in order to let him into the village). After the village tournament, he also wears a pair of glasses. Kinro was born into Ishigami Village and at some point took up the role as guard with his brother.
