Matsuyo Matsuno, mother of the six Matsuno brothers, is portrayed as a sharp-witted housewife whose devotion to her family intertwines with shrewd pragmatism. Her design, modeled after the creator’s mother, features short black hair with flipped bangs and oversized round glasses essential for her extreme near-sightedness—without them, she fails to distinguish even large animals. Later adaptations age her gracefully, styling her hair in a tight bun and refining her demeanor to reflect middle-aged maturity.

Tasked with managing a chaotic household, Matsuyo navigates familial challenges with resourcefulness laced with mischief. Early narratives showcase her thrifty ingenuity, such as purchasing identical bulk clothing for her sons, unintentionally amplifying their indistinguishability. Financial pressures and the strain of raising six boys drive her to contemplate extreme solutions, including arranging adoptions. Yet her playful streak emerges in schemes like disguising Osomatsu in a bear costume to startle her husband or manipulating Iyami’s insurance claims for profit.

Her personality melds steely practicality with subtle vulnerability. Moments of neglect—such as her family overlooking her illness—or anxious preoccupation when a son departs reveal cracks in her resilient facade. A penchant for luxury surfaces in stories where her pursuit of gold and jewelry eclipses practicality. As her sons cling to adulthood without independence, later arcs refocus her role: she vocalizes exasperation over their prolonged reliance, yearning for them to marry, move out, and grant her grandchildren.

Early inconsistencies in the family’s surname and her husband Matsuzo’s occupation were later clarified in official lore. Throughout all iterations, Matsuyo remains a steadfast emblem of parental endurance, navigating both the absurdities and emotional complexities of raising six sons with a blend of tenacity and humor.