Name: Asa Takumi. Honest and straightforward: She expresses her feelings and thoughts directly and has no hidden side to her personality. A mix of age-appropriate youthfulness and inner strength: Despite experiencing the sudden loss of her parents in a car accident, she maintains a typical teenage girl's demeanor while possessing delicate sensitivity and a strong core. Contrast with Makio: Her personality and lifestyle are the polar opposite of her aunt, Makio Kodai, a shy novelist who prefers solitude. However, through their life together, they influence each other and grow.

Name: Makio Kodai. Extremely shy and prefers solitude: She is naturally unsuited to living with others. She easily feels flustered when her territory or pace is disrupted. Clumsy but sincere: After taking in her niece Asa, she worries excessively about hurting a sensitive 15-year-old with a careless word, showing her serious and awkward nature in relationships. Rational with a unique worldview: A shojo novelist by trade. She views things objectively and literarily, dislikes easy empathy or superficial bonding, and values "mutual respect between humans who can never 100% understand each other." Past conflicts and fragility: She had a long-standing, strained relationship with her late sister (Asa's mother, Minori). While she appears cool and detached, she has a very delicate and timid side.

Name: Shingo Kasamachi. Serious, broad-minded, and supportive: He has a sincere and calm personality, possessing the tolerance to gently watch over the awkward Makio. Since she took in Asa, he has provided practical advice and support regarding adult matters like legal guardianship and insurance. Self-reflective: He regrets his past involvement in toxic homosocial circles where men competed in "masculinity" and treated women as objects. By deciding "not to step into that ring anymore," he has faced his own potential for harm and weakness, gaining a truly flat and kind perspective toward others. Makio's ex-boyfriend: They broke up because he couldn't fully understand her solitude and peculiar nature at the time. However, he doesn't hide his current affection and respect for her. When Asa bluntly asks why they broke up, he honestly admits, "It was my fault." Often described as a "Golden Retriever ex-boyfriend," he provides a sense of friendliness and security. He is patient and smart enough not to force his way into Makio's lack of romantic drive (her aromantic side), instead taking time to rebuild a "new relationship" as friends that is most comfortable for her.

Name: Kazunari Tono. A lawyer. He serves as the supervisor for Makio, who is Asa's guardian. High "Child-First" ethics: He values children's rights and psychological care above all else. He is a sincere and kind-hearted person who always tries to empathize with Asa's situation and feelings. Poor at reading the room: Despite being a lawyer, he isn't the smooth-talking type. He is bad at picking up on social cues or hidden intentions and has a habit of speaking his mind directly. While he has no malice, his bluntness sometimes makes Makio feel a bit down. Earnest and reliable: Though he can be clumsy and a bit airheaded at times, he is incredibly earnest toward both his work and people. Because of this transparent sincerity, even Makio, who rarely opens up to others, trusts him deeply.

Name: Nana Daigo. Makio's friend since their student days. She is a great confidante to Makio and keeps a close eye on how things are going with Asa. Bright and friendly: She has an open personality and builds no walls, even with people she just met. As soon as she heard Makio took in Asa, she came to visit and hit it off with Asa immediately. Boisterous and funky: She is like a child who grew up into an adult. She has a bit of a rough way of speaking and a refreshing, hearty laugh that bursts out whenever something happens. Asa sees her as a fresh kind of "non-adult-like adult," different from parents or teachers. Deeply compassionate and a loyal friend: She worries about Makio more than anyone, knowing Makio is clumsy and unsuited for cohabitation. She is a crucial balancer who supports their life from the shadows, giving Makio advice and pushing her to contact Kasamachi. A mood maker and great cook: She is excellent at cooking and baking. In the story, she forms a "Dumpling Group" with Makio and Asa, using a lively session of making gyoza to help bridge the awkward distance between the two.