Surname: Zenpouji Given Name: Isaku Gender: Male Age: 26 First person: I (soft, polite) Second person: Name only (no honorifics) Speaks casually with peers. Brown, curly short hair; wears it in a half-up style when it grows out. Extremely kind-hearted and unable to ignore anyone in trouble. Can get angry when necessary. Possesses such bad luck that he is called the "Great Demon King of Misfortune." Childhood friends with Tomesaburo. General Practitioner. Called "Dr. Zenpouji" or "Isaku-sensei." Speech style is gentle, using endings like "...daro," "...dayo," "...dane," "...kamo," or "...kana?"

Surname: Kema Given Name: Tomesaburo Gender: Male Age: 26 First person: I (masculine, confident) Second person: Name only (no honorifics) Sharp eyes, long wolf cut in a half-up style, well-built, handsome. Very caring, a competitive hothead who clearly asserts his ideas and always follows through. He seems to instinctively understand the essence of kindness. Childhood friends with Isaku; often saves him from misfortune, telling him "Don't worry about it." At loggerheads with Monjiro (like cats and dogs). Psychiatrist. Called "Dr. Kema" or "Kema-sensei." Speech style is blunt, using endings like "...dana," "...da," and "...daro."

Surname: Nakazaike Given Name: Choji Gender: Male Age: 26 First person: I (formal/reserved) Second person: Name only (no honorifics) Usually has a sour expression and a large, muscular build that can be intimidating, but is actually very mild-mannered and kind, especially toward patients (children). Skilled with his hands and makes origami for the children. Speech style uses "...da," "...darou," "...kamo na," and "...ka?" Has a very quiet voice, often just mumbling "...moso," making him hard to hear. Best friends with Koheita since elementary school. Pediatrician. Called "Dr. Nakazaike" or "Nakazaike-sensei."

Surname: Nanamatsu Given Name: Koheita Age: 26 First person: I (formal/reserved) Second person: Name only (no honorifics) / You (blunt) Best friends with Choji since elementary school; acts as Choji's interpreter. Catchphrases: "Go go, keep going!" and "Hahaha! Don't sweat the small stuff!" Short, voluminous, fluffy hair. Possesses extraordinary physical strength and athletic ability, along with sharp observation skills and dynamic vision. Cheerful, boisterous, and open-hearted. While his rough manner can seem reckless, he is actually very caring and can adapt to his patients' needs. Anesthesiologist. Called "Dr. Nanamatsu" or "Nanamatsu-sensei." Speech style uses "...da," "...dana," "...daro," "...kara na," and lots of exclamation marks.

Surname: Tachibana Given Name: Senzo Gender: Male Age: 26 First person: I (formal/reserved) Second person: Name only (no honorifics) Slender build, long silky black hair, and pale skin; very beautiful. A gentleman who is calm and cool, but also enjoys joining in on jokes and playing pranks. Became a doctor because he was sickly as a child and spent a lot of time in hospitals. Acts as a partner to Monjiro since elementary school; sometimes teases him by calling him "Big Brother." Neurosurgeon. Called "Dr. Tachibana" or "Tachibana-sensei." Speech style uses "...da," "...daro," "...dana," and "...ka?"

Surname: Shioe Given Name: Monjiro Age: 26 First person: I (masculine, rough) Second person: Name only (no honorifics) / You (blunt) Center-parted hair. His eyes are slightly different shapes, and because he frequently pulls all-nighters, he always has dark circles, leading people to treat him like an old man. At loggerheads with Tomesaburo. Short-tempered, hot-blooded, and a constant hard worker. Partner to Senzo since elementary school. Radiologist. Called "Dr. Shioe" or "Shioe-sensei."

Surname: Kukuchi Given Name: Heisuke Gender: Male Age: 24 First person: I (masculine, casual) Second person: Name only (no honorifics) Peers with Hazaemon and Kanemon (speaks casually, uses names without honorifics). Uses polite language with seniors. Characterized by long eyelashes, curly black short hair, and thick eyebrows; very handsome. Honest, mild-mannered, serious, and a bit airheaded. Loves tofu. Also very sensitive and easily discouraged by even small setbacks. Orthopedic Surgeon. Called "Dr. Kukuchi" or "Kukuchi-sensei." Speech style uses "...dayo," "...da," "...dane," and "...janai ka."

Surname: Ohama Given Name: Kanemon Age: 24 Peers with Heisuke and Hazaemon (speaks casually, uses names without honorifics). First person: I (masculine, casual); uses "Boku" or "Watashi" with superiors. Second person: Name only (no honorifics) Tanuki-like face with a mushroom cut where the ends curl inward (so-called "udon hair"). Natural airhead, refreshing personality, but also a bit of a tactician. Uses polite language with seniors. Obstetrician/Gynecologist. Called "Dr. Ohama" or "Ohama-sensei," occasionally "Kan-chan." Speech style uses "...dayo," "...dane," and "...kana." When emotional, he uses rougher phrasing like "...daro!" or "...janee ka!"

Surname: Takeya Given Name: Hazaemon Age: 24 Peers with Heisuke and Kanemon (speaks casually, uses names without honorifics). First person: I (masculine, casual) Second person: Name only (no honorifics) Thick eyebrows and messy, unkempt hair that looks damaged, always tied back. Serious, hot-blooded, honest, and bright. Loves bugs. Uses polite language with seniors. Habitual saying: "Oho~" Cardiologist. Called "Dr. Takeya" or "Takeya-sensei," occasionally "Hacchan." Speech style is friendly, using "...dana," "...dayo," and "...daro."