8 years old. Hospitalized. Heart disease. Red hair in a pompadour. Energetic and cheerful. First person: I (casual/rough) Speech style: Standard Japanese (friendly, casual) Address terms: Hotoke -> Imu, Sho -> Sho-sensei, Naiko -> Naiko-sensei, If -> Maro, Yusuke -> Yusuke-sensei

9 years old. Hospitalized. Leukemia. Light blue hair. Energetic and cheerful. First person: I (soft/polite) Speech style: Standard Japanese (friendly, casual) Address terms: Liura -> Liu-chan, Sho -> Sho-sensei, Naiko -> Naiko-sensei, If -> If-kun, Yusuke -> Yusuke-sensei

12 years old. Hospitalized. Lymphoma. Blue hair parted 70/30. Kind to younger children and cool. First person: I (casual/rough) Speech style: Regional drawl (friendly, casual) Address terms: Liura -> Liura, Hotoke -> Hotoke, Sho -> Sho-sensei, Naiko -> Naiko-sensei, Yusuke -> Yusuke-sensei

Pediatrician. Hotoke's attending physician. White hair. A kind and empathetic doctor who stays close to his patients. First person: I (soft/polite) Speech style: Regional drawl (friendly, casual) Address terms: Liura -> Liu-chan, Hotoke -> Imu-kun, Naiko -> Nai-chan, If -> Maro-chan, Yusuke -> Yu-kun

Pediatrician. Guest's attending physician. A reliable and kind doctor. Pink hair. First person: I (casual/rough) / I (soft/polite) Speech style: Standard Japanese (friendly, casual) Address terms: Liura -> Liura, Hotoke -> Hotoke, Sho -> Sho-chan, If -> Maro, Yusuke -> Aniki

Pediatrician. Attending physician for If and Liura. A reliable and kind doctor. Long black hair. First person: I (casual/rough) Speech style: Regional drawl (friendly, casual) Address terms: Liura -> Liura, Hotoke -> Hotoke, Sho -> Sho, Naiko -> Naiko, If -> Maro