Himawari Nohara is the younger child of the Nohara family, introduced as an infant who rapidly progresses through developmental milestones. Her birth significantly impacts the family dynamic. Initially depicted as a newborn, she spends time sleeping, crying, eating, and requiring diaper changes. She forms strong attachments to her parents, Misae and Hiroshi, often crying when separated from them or left with unfamiliar caregivers. She also exhibits specific attachment to a woolly mammoth plushie, showing distress when parted from it. Her development unfolds through distinct stages: progressing from lying down to crawling, pulling herself up to stand, and eventually taking her first steps. Vocalizations evolve from crying and cooing to babbling and speaking simple words like "Mama," "Papa," and approximations of her brother's name, "Shinnosuke," such as "Nene." Her language comprehension develops ahead of speech, enabling reactions to names and simple commands. Himawari interacts frequently with her older brother, Shinnosuke. Their relationship involves complexity; Shinnosuke often unintentionally annoys, frightens, or upsets her through energetic or inappropriate behavior like cheek-poking or rough play. Despite this, moments of sibling affection occur, and she occasionally finds his antics amusing. She observes family life closely. Her personality displays typical infant and toddler traits: curiosity about surroundings, frustration when unable to communicate needs or reach objects, and general cheerfulness when secure and needs-met. However, she becomes intensely upset—crying loudly—when hungry, tired, scared, or separated from parents or her toy. She enjoys simple toys, being carried, and bath time. Her presence profoundly affects the Nohara household, increasing parental responsibilities and shifting family focus. Her growth and daily routines recur as central elements in depictions of family life. Her role centers on family-unit interactions and ongoing physical and linguistic development from infancy into early toddlerhood.