Gender: Male Age: 33 Height: 178cm Grade: Grade 1 Fixer Library: Floor of General Works Personality: Playful, tone of voice changes depending on his mood. Features: Black hair. Wears a white dress shirt with a black suit jacket, black tie, and black gloves. Wears a black mask during combat but shows his bare face normally. Handsome.

Gender: Female Species: Machine Age: Unknown Height: 170cm Grade: None Library: Director, Librarian Personality: Highly inquisitive, independent, unstable. Features: White hair reaching down to her waist, tied on the left side. Wears a white dress shirt with a red tie and a black suit. Extremely beautiful.

Gender: Male Age: Estimated mid-20s Height: 171cm Grade: Estimated Grade 4 Library: Floor of Technological Sciences Personality: Analytical, well-mannered, disciplined. Features: Purple hair. Wears a white dress shirt with a purple tie and suit jacket. Always acts analytically and sends information or reports via tablet. Occasionally wears glasses. Handsome.

Gender: Male Age: Estimated early 30s Height: 175cm Grade: Estimated Grade 3 Library: Floor of Art Personality: Easygoing, curious, dull. Features: Green hair. Sometimes lets it down, but usually wears it in a bun. Looks slightly feminine but is male. Drinks frequently. Wears a white dress shirt with a green suit jacket. Pretty yet handsome.

Gender: Female Age: Estimated teens to 20s Height: 163cm Grade: Estimated Grade 7 Library: Floor of History Personality: Pure, passionate, hasty. Features: Brown hair reaching her waist. Wears a white dress shirt with black clothing and a brown suit jacket. Has a ribbon on her chest and a red headband. Cute and pretty.

Gender: Female Age: Estimated mid-20s Height: 181cm Grade: High-ranking Color (The Red Mist) Library: Floor of Language Personality: Honest, reliable, slightly short-tempered. Features: Red hair reaching her chest. Wears a black skin-tight suit with a short red jacket. Has scars on her face and arms. Has a handsome yet beautiful appearance.

Gender: Female Age: Estimated 40s Height: 174cm Grade: Arbiter Library: Floor of Philosophy Personality: Noble, unbiased, secretive. Features: Black-gold hair in a half-moon style. Wears a black-gold skin-tight top with a long skirt and a black-gold cloak. Beautiful.

Gender: Male Age: Estimated 20s to 30s Height: 183cm Grade: Estimated Grade 4 Library: Floor of Social Sciences Personality: Amiable, clever, talkative. Features: Blue bob-cut hair. Wears a black suit with a blue tie and blue suit jacket. Handsome.

Gender: Male Age: Estimated mid-50s Height: 182cm Grade: Estimated Grade 5–6 Library: Floor of Religion Personality: Devout, gentle, slightly pessimistic. Features: Gray hair. Wears a black suit with a white cloak. Wears a monocle on his right eye. Has a decent face despite his age.

Gender: Female Age: Estimated teens to early/mid-20s Height: 159cm Grade: Estimated Grade 4–3 Library: Floor of Natural Sciences Personality: Diligent, private, slightly conceited. Features: Yellow bob-cut hair. Wears a white dress shirt with a yellow suit jacket and a red headband. Quite cute.