Hiroshi Sakura is Maruko's father, known for his easygoing and optimistic nature. Often seen relaxing at home reading newspapers or watching television, he maintains a carefree demeanor. While he sometimes brushes off Maruko or pretends not to listen, he remains a reliable father figure. His parenting style is generally lax, occasionally even supporting his children's misdeeds rather than opposing them—a trait Maruko seems to have inherited. Hiroshi experiences social anxiety in unfamiliar settings like large gatherings or wedding receptions, where he may fumble speeches or visibly shake. He laughs excessively, especially at Maruko's humorous stories. His interests include drinking sake, watching baseball, and fishing, often reading fishing techniques or maintaining his gear. He previously smoked frequently but quit after being confronted. Hiroshi also has a noted tendency for flatulence in family settings, reportedly using it to stay warm in bed. His favorite foods are katsuo sashimi, boiled fish, ramen, and milk-flavored kakigōri; he dislikes gratin and sweets. He favors singers Hibari Misora and Mina Aoe. Hiroshi is married to Sumire and is father to Maruko and Sakiko. He rarely assists with household chores, frequently relaxing in the kotatsu instead. His relationship with his parents, Tomozou and Kotake, is part of the family structure. Details beyond these traits and family dynamics are not extensively documented in official media.