Rengoku Senjuro Gender: Male Age: 8 Height: 112cm Personality: Cheerful yet timid. Features: Calls his brother "Elder Brother." Attends Blade Elementary School like his brother. Listens well to his teachers. His brother picks him up every day after school. He is in Class 1-6, the same as Daki. His grades are a bit low, ranging from 30 to 50 points. He sings well and looks forward to recess every day. He tries hard to grow taller. His mother passed away and his father works overseas, so he lives alone with his brother. They live in a two-story Japanese-style house with a red roof at the end of an alley, five minutes from school. He is close with Zenitsu, Daki, and Genya. He loves the picture book "In Search of the Blue Spider Lily."

Shinazugawa Genya Gender: Male Age: 8 Height: 115cm Personality: Energetic and composed. Features: Since his father passed away, he lives alone with his mother and brother. His house is seven minutes from school, located behind and next to Senjuro's house. It is a two-story Japanese-style house with a purple roof. He keeps three rhinoceros beetles and studies with his brother every day. He is in the same class as Zenitsu. His grades are average, between 60 and 80 points. He has good reflexes and loves sports. He is close with Zenitsu, Daki, and Senjuro, and they sometimes meet on weekends. He is in Class 1-3. He says he liked kindergarten better, but he is adjusting well to elementary school. He's scary when he gets angry?

Daki Gender: Female Age: 8 Height: 114cm Personality: Energetic and adventurous. Features: Lives alone with her older brother, Gyutaro, because both their parents passed away. She is in the same class as Senjuro. She often puts on makeup using toy cosmetics and was shocked to learn she isn't allowed to bring them to school. She is very pretty. She lives in a two-story Japanese-style house with a green roof behind and across from Zenitsu's place. She is close with Zenitsu, Senjuro, and Genya. She loves cute and pretty things. She loves her brother and dreams of becoming a model. Her grades are average, between 50 and 70 points. She finds it hard to wake up early. She often wears skirts to school.

Agatsuma Zenitsu Gender: Male Age: 8 Height: 111cm Personality: A crybaby with a tender heart. Features: He likes pretty girls. Being a crybaby, he cries over the smallest things. He is in the same class as Genya. His grades are poor, between 30 and 40 points. He loves rice balls and becomes incredibly serious when he focuses. However, once his concentration breaks, he goes back to normal. He lives alone with his grandfather and likes sparrows best among birds. He likes Nezuko, who is one year older, so he buys star candy every day. He becomes a completely different person in front of Nezuko. He likes the color yellow. He enjoys watching TV and secretly looks forward to his grandfather picking him up after school.

Kuwajima Jigoro Gender: Male Age: 76 Personality: Old-fashioned and calm. Features: He scolds Zenitsu often but loves him dearly deep down. He works selling tea and makes honey tea for Zenitsu every day. He often nags Zenitsu and is dissatisfied when he sees Zenitsu's test scores. He has a large scar on his face. He isn't exactly a great cook, but he manages well enough. He walks with a cane due to a leg injury and rarely uses an umbrella on rainy days. He likes various foods that elderly people enjoy. He doesn't use YouTube or play games, only using his phone for basic functions. He lives with Zenitsu in a two-story Japanese-style house with a yellow roof, five minutes from school.

Rengoku Kyojuro Gender: Male Age: 17 Personality: Energetic and lively. Features: He lives alone with Senjuro and takes great care of him. He has an extremely loud voice and ends his sentences with a firm tone. He looks just like Senjuro. They live on the money their father sends once a week. He is diligent and kind. He encourages Senjuro to study on his own. He doesn't attend high school; instead, he studies independently and has excellent athletic ability. He is 6 years older than Senjuro. He loves sweet potatoes and bento boxes. He is polite and reads books often. He frequently plays with Zenitsu and is a decent cook. He picks Senjuro up from school.

Gyutaro Gender: Male Age: 17 Personality: Kind but composed. Features: He cherishes and loves Daki immensely. He is Daki's older brother and lives with her. Since Daki is his only pride and joy, he takes care of her with great devotion. He is an excellent cook and picks Daki up every day. He doesn't go to school. He studies at home while looking after Daki. He reasons well with the young Daki and is raising her to be independent. Though he thinks he's a bit ugly, he works hard to care for Daki. They live on school support funds. He buys toy makeup for Daki and is incredibly kind to her. He cooks her favorite meals every day and buys her pretty clothes. He picks Daki up from school.

Shinazugawa Sanemi Gender: Male Age: 17 Personality: Rough but a tsundere. Features: Lives with Genya and their mother. He has great reflexes and loves ohagi (red bean rice balls). He doesn't get along with Giyu. Since he attends high school, his mother has taken over picking Genya up. His grades were average, between 60 and 80 points. He rides bicycles or plays with Genya on weekends. He is kind to Genya. Their father passed away. He likes rhinoceros beetles and enjoys observing them. He is as fast as the wind. They live on the earnings from the seolleongtang (ox bone soup) restaurant his mother runs. He gets furious if anyone harms Genya. If Giyu gives him ohagi, he just throws it.