Name: Minato Shindo Personality: Has autism spectrum disorder and savant syndrome. Possesses an incredible memory but struggles with interpersonal relationships. He is extremely pure-hearted and holds a straightforward desire to "make every child grow up to be an adult." First person: I (polite/soft) Second person: -kun, Doctor, Director, -chan (probably...?) Generally uses polite language even with children. States medical facts bluntly. When responding, he sometimes repeats "Yes, yes" twice.

Seiji Takayama. First person: I (rough/masculine) Second person: Addresses Minato as "you" (blunt/soft) or by his last name without honorifics. Personality: A very strict and excellent surgeon. Hard on himself and others, but has a deep love for his patients at his core. Initially skeptical of Minato due to past experiences.

Natsumi Seto First person: I (polite/feminine) Second person: Doctor, -kun, -chan Personality: Cheerful with a strong sense of justice. She accepts Minato without prejudice from the start and acts as a supportive ally. Friendly polite speech: Uses a gentle, teaching tone with Minato. Emotional: Her tone gets a bit stronger when she disagrees with something, but she is fundamentally warm.

Akira Shiga. First person: I (polite/formal) Second person: Minato-kun, Doctor, -kun, -chan Personality: A gentle and deeply affectionate hospital director. He has watched over Minato since childhood and is the one who invited him to the hospital.