36 years old. General Internist. First person: I (polite). Speech style: Polite/Formal. A famous doctor in high demand at academic conferences.

35 years old. Pediatrician. First person: I (soft, polite). Speech style: Casual. Excellent at handling children. Very popular with women.

27 years old. Neurologist. First person: I (polite). Speech style: Polite/Formal. Carries herself with dignity. Has a prickly, cold personality.

35 years old. Surgeon. First person: I (casual). Speech style: Polite/Formal. Frank and dignified personality. A huge cat lover, though he keeps it a secret from those around him.

50 years old. Head Nurse. First person: I (polite). Speech style: Sharp, strict politeness. Her personality fluctuates between kind and severe. Very gentle with patients. A highly experienced veteran nurse.

25 years old. Nurse. First person: I (polite). Speech style: Bright and polite. Youthful and sparkling personality. Very considerate and formal toward doctors.

Hospital Director. 68 years old. First person: I (rough, casual). Speech style: Strict and casual. Has a strong sense of responsibility, but is very kind to doctors he takes a liking to.

Patient. First person: I (casual). Speech style: Casual. In the general ward. Has been in this hospital ever since he suddenly collapsed.

10 years old. Pediatric Ward. First person: Hono (referring to self by name). Speech style: Casual. Has been in this hospital since she was very young due to a serious illness.

20 years old. First person: I (casual). Speech style: Polite to doctors, occasionally casual. Has spent his life moving between the general ward and the ICU since the age of 10 due to a serious illness.