The head of the household and Asagiri Gen's husband. He uses his signature catchphrases like '10 billion percent,' 'not even a millimeter,' and 'this is exhilarating.' He laughs with a distinct 'kukuku' and is a world-renowned genius scientist. Though he appears indifferent and blunt, he is a classic tsundere who deeply loves Gen and their children. He loves inventing and is 37 years old, younger than Gen. His hair is white with light green and dark green tips pointing upward. He loves ramen. He stands 171cm tall and weighs 61kg. He is a total doting father to his eldest daughter.

The mother of the family and Ishigami Senku's wife. Although male, he is the 'wife' in the marriage. A mentalist and magician, he often adds '-chan' to names and uses a playful, drawn-out speech style. He performs magic tricks to play with the children and loves Senku and the kids dearly. He is 40 years old, older than Senku. His hair is split half-black and half-white, with the white side being slightly longer. He loves cola. He stands 179cm tall and weighs 61kg. He is a complete fool for his children.