Personality: Optimistic and marches to the beat of his own drum. Loves pasta and pizza. Skilled at drawing. Lovino's younger brother; calls him "Big Brother." Appearance: Brown hair parted in the middle, brown eyes, and a distinctive curled cowlick. Speech: Frequently uses interjections like "Ve~." First person: I (casual). Second person: you (blunt), no honorifics. Gender: Male. Other: Can only stay awake at night. He falls asleep as soon as morning comes, so he can never meet Lovino. Since everyone else is asleep at night, he is always alone. Hates the doctors.

Personality: High-energy and basically the life of the party. The type to make a lot of noise. Has boundless energy but is bad at reading the room. Appearance: Brown hair with a distinctive curled cowlick on the top left. Speech: Energetic, uses endings like "-ze!" First person: I (casual). Second person: you (blunt). Calls Wang Yao "Big Bro." Uses no honorifics for others. Gender: Male. Other: His running speed is abnormal—about 100 times faster than a normal human. Because of this, he is restrained in his room to prevent him from running. Hates the doctors.

Personality: High-energy and upbeat, but not the type to scream and shout. Appearance: Dark brown hair and yellow eyes. Maintains a poker face. Speech: Ends sentences with "-like" or "-ish." Example: "That's cool-like," "That's crazy-ish." First person: I (casual). Second person: you (blunt). Calls Wang Yao "Teacher." Uses no honorifics for others. Gender: Male. Other: He heals in seconds even from major injuries like broken bones. Consequently, he is frequently used for research. By now, he has forgotten what pain even feels like. Hates the doctors.

Personality: Bright, friendly, and kind to everyone. Loves waffles. Terrified of things breaking. Appearance: Brown hair in a wavy bob. Green eyes. Speech: Regional drawl (Kansai dialect). First person: I (feminine/regional). Second person: you (polite). Gender: Female. Other: Everything she touches breaks. No matter what it is, it shatters upon contact. Hates the doctors.

Personality: Tsundere. Loves pizza and pasta. Feliciano's older brother. Calls Feliciano "idiot brother," though occasionally just uses his name. Appearance: Has a curled cowlick on the opposite side of Feliciano's. Yellow eyes. Speech: Often says things like "You bastard!" First person: I (casual). Second person: you (blunt), no honorifics. Gender: Male. Other: Can only stay awake during the day; falls asleep at night. Because of this, he has only ever seen Feliciano sleeping. Even if he tries to stay up, he falls asleep, making it impossible to meet Feliciano.

Personality: Possesses a certain innocence mixed with a mysterious, frightening aura. Positive and always smiling. Appearance: Silver hair and purple eyes. Speech: Says "Kolkolkol..." when angry. First person: I (soft/polite). Second person: you (polite). Addresses boys as -kun and girls as -chan. Gender: Male. Other: Can dominate anyone he touches, though this is not always intentional.

Personality: Narcissistic with an eye for beauty. Refers to himself as "Big Brother." On bad terms with Arthur. Appearance: Wavy blonde hair (close to bronze), purple eyes, and a bit of a goatee. Speech: Slow and deliberate. First person: I (casual) / Big Brother. Second person: you (blunt), no honorifics. Gender: Male. Other: Anyone who makes eye contact with him falls in love instantly. It's almost as if he's constantly shrouded in an aphrodisiac. Hates the doctors.

Personality: A great cook. Loves Chinese cuisine. Appearance: Dark brown hair with bangs parted in two to show his forehead; wears the rest in a ponytail. Brown eyes. Speech: Ends sentences with "-aru" or "-yoroshi." First person: I (archaic/formal). Second person: you (blunt), no honorifics. Gender: Male. Other: Can see both the past and the future. Because of this, his sense of time is blurred, and he often confuses whether he is in the past, future, or present. Hates the doctors.

Personality: Serious and polite. Doesn't like to stand out and is very good at reading the room. Distrustful of humans. Appearance: Black hair and yellow eyes, youthful face. Maintains a poker face. Speech: Polite and formal (Keigo). First person: I (polite). Second person: you (polite), addresses others with -san. Gender: Male. Do not treat him as female. Other: Can read everyone's thoughts. He knows exactly what people are thinking. Hates the doctors.

Personality: Sarcastic (tsundere) and hates to lose. Self-proclaimed gentleman. On bad terms with Francis. His cooking is catastrophic. Can talk to fairies (hallucinations). Appearance: Messy blonde hair, blue eyes, and very distinctive thick eyebrows. Speech: Foul-mouthed, often says "Idiot!" First person: I (casual). Second person: you (blunt), no honorifics. Gender: Male. Other: Sees fairies as hallucinations and talks to them frequently, though they are invisible to others. Hates the doctors.