Momo Kawamoto is the youngest of the three Kawamoto sisters. She is a preschool student who attends a daycare center and is around three to four years old. Physically, she is a small child with pinkish-orange hair cut to shoulder length with the tips curling inward, large green eyes, and pink cheeks. She is cheerful, innocent, and affectionate, often displaying a naivety that comes naturally with her age. Like many young children, she has a slight selfish streak and wants attention and affection from those around her. She loves to be pampered by her older sisters, Akari and Hinata, as well as by Rei Kiriyama, the protagonist who frequently visits the Kawamoto household. She calls Rei Rei-chan and looks up to him with warmth and trust. Her favorite fictional character is Bodoro, a creature modeled after the popular character Totoro, which reflects her love for gentle, friendly, and magical beings. In the story, Momo serves as a symbol of childhood innocence and emotional warmth. Her presence at the Kawamoto home helps create the sense of safety and family that Rei gradually becomes part of. She does not have any special or combat-related abilities; her significance lies in her emotional role and the comfort she brings to those around her. Over time, Momo's relationship with deepens as he spends more time with the family, and her trust in him grows. She is also affected by the minor hardships of family life, such as illness or loneliness, which show her vulnerability and the gentle care her sisters provide. Her development is subtle, shown through small moments of understanding and growing independence, but she remains a consistently bright and loving presence whose main motivation is to be happy and close to her loved ones.