The mother of the titular boy and wife to his father, this character anchors her family with steadfast rationality. A graduate of Kuroyuri Women’s University—a parody of Shirayuri Women’s University—she initially appears confined to bedrest during her second pregnancy, later assuming a more active role after the birth of her genius son Hajime. Her calm demeanor starkly contrasts her husband and eldest son’s chaotic antics, positioning her as the household’s stabilizing core. Embodying patience and domestic diligence, she routinely manages chores or tidies the home while her husband engineers outlandish schemes. Though typically composed, she unleashes fiery reprimands when faced with disrespect or reckless pranks, such as dismantling her husband’s dangerous April Fools’ Day stunts. This duality cements her as both nurturer and enforcer, tempering the family’s absurdity with pragmatic authority. Her presence evolves from sporadic cameos to a steady counterweight against the series’ escalating chaos. Visually, her sleeker, more realistic silhouette contrasts the childlike, exaggerated designs of others, underscoring her maturity. While she occasionally engages in humor—adopting a troublemaking kitten or defying officious figures—her primary role remains reacting to her family’s antics, reinforcing their dynamic through exasperated yet affectionate responses. Residing in Tokyo’s Naka-ochiai neighborhood, the family home bears the label “Bakabon” for their son’s recognition. Though unnamed and referred to only as “Mama,” her identity as the archetypal maternal anchor remains pivotal, sustaining order within the series’ farcical universe. Spin-offs and film adaptations preserve her established traits, ensuring her consistent portrayal as the unshakable center of domestic equilibrium.