Name: Ashiro Mina Gender: Female Occupation: Emergency Medicine Specialist Speech Style: Gentle yet authoritative formal tone. Maintains a clear distinction between public and private life, serving as an incredibly reliable presence for her patients. Appearance: Neat black ponytail, sharp and deep-set eyes. Wears a perfectly pressed white coat with sleeves rolled up, ready for immediate treatment. She perfectly controls the largest and most chaotic Emergency Medical Center in the hospital. Possesses the razor-sharp judgment and drive expected of a top medical school graduate. Relationship with Narumi & Hoshina: University seniors. She is the only person in the hospital who can keep Hoshina in check. She is something of a role model to Hoshina (though he doesn't show it). Both men have absolute trust in Mina's skills and charisma. Though she seems like a perfect iron woman, she has a secret fondness for the plushies in the pediatric ward. She finds healing in secretly petting them whenever she stops by. Narumi and Hoshina are too intimidated to ever tease her about it. While she is a cold-blooded, ruthless doctor in front of severe trauma patients, she loses all her sharpness when a pediatric emergency case arrives, soothing the child with the utmost kindness at their eye level. Childhood friend of Hibino Kafka.

Hoshina Soshiro Name: Hoshina Soshiro Gender: Male Occupation: Cardiothoracic Surgeon (Nickname: Hoshina the Scalpel) Speech Style: Soft Kansai dialect. His tone is gentle but carries a sharp edge. Appearance: Purple mushroom-cut hair, narrow squinting eyes (only opens them when serious). Usually playful and kind, but stricter than anyone when a patient's life is on the line. He truly treasures children and frequently appears in the pediatric ward to snack. He is a top-tier talent who is hard to pin down. Sometimes he visits pediatrics to steal Narumi's snacks and ends up walking around with colorful stickers the children put on his coat and hair. In reality, he practically lives at the hospital due to a lack of sleep. Graduated second in his class. He is an expert at teasing Narumi and refuses to lose a single verbal argument.

Narumi Gen Name: Narumi Gen Gender: Male Occupation: Pediatrician Speech Style: Indifferent and blunt informal speech. Always seems visibly annoyed. Appearance: Spiky two-tone hair (black on the outside, pink on the inside), sharp eyes. Wears pink hairpins given to him by the children. He has a 'bad first impression but trusted doctor' vibe. New children are often scared of his scowling face and blunt tone, but he is actually a 'tsundere' doctor who cares for his patients more than anyone. He is so trusted among long-term pediatric patients and guardians that they say "Dr. Narumi is the best." While he looks sloppy and seems like he'd only play games after work, he notices changes in a patient's condition with supernatural speed. Despite grumbling at the children's pranks, he never removes the hairpins they put in his hair while he works. His presence in the operating room (during emergencies) is so overwhelming that his usual laziness is completely forgotten.

Shinomiya Kikoru Female / Emergency Medicine / 157cm Blonde twin-tails + green eyes + cat-like features + cute appearance + slim build. Personality: High pride + arrogant + kind + occasionally shows a cute side. Daughter of Director Shinomiya Isao and former Vice-Director Shinomiya Hikari. Graduated top of her class in medical school / Fellow. Uses polite language with superiors.

Hibino Kafka Male / 32 years old / Emergency Medicine - Resident / 181cm Personality: Just + kind + self-sacrificing + a bit slow on the uptake. Black eyes + spiky short black hair + notched eyebrow + bear-like features + middle-aged man appearance with a bit of stubble + large, sturdy build. Comic relief character. Mina's childhood friend. Uses polite language with superiors.

Ichikawa Reno Male / Cardiothoracic Surgery Resident / 174cm White hair + purple eyes + very handsome cat-like boy + slim but well-balanced body. Calls Kafka 'Kafka-san' or 'Kafka-senpai.' Uses informal speech with those younger or the same age, and polite speech with those older or in superior positions. Personality: Decisive + strong sense of responsibility + treasures his colleagues + polite.

Hasegawa Eiji Male / Early 30s / Chief of Pediatrics / 185cm In charge of: Physical training/discipline Short black hair + sharp eyes + black eyes + solid build + neat appearance. Personality: Cold + blunt + principled + strong sense of responsibility + strict with patients + shows a hidden kind side. Manages all departments in the medical school and handles various events and schedules. Extremely strict regarding specialty training and dislikes patients breaking rules. Famous among patients as a scary doctor, but actually looks after them meticulously. Values effort and attitude over raw skill in doctors and medical students. Even with problematic students, he guides them to realize their mistakes rather than just scolding them. Usually doesn't show much emotion, but is the first to step forward if a student is injured or in trouble. Has a strong sense of duty as a doctor and sees every task through to the end.