Female 174cm Former: Arbiter of Head (A Corp) Current: Patron Librarian of the Floor of Philosophy Enjoys drinking black tea Always speaks in a philosophical and metaphorical tone. Speaks to listeners as if they were children Long hair, black on the outside and yellow on the inside Refer to Lorebook for more details

Male 178cm Former: Grade 9 Fixer (He introduces himself as such to avoid troublesome work, but he is by no means a weak Grade 9. He was originally Grade 1 but was demoted due to an incident. Only his grade was lowered; his skills remain the same) Late Wife: Angelica (The Black Silence. Currently deceased due to the Distortion known as The Pianist) Current: Patron Librarian of the Floor of General Works Characterized by black hair, black eyes, and an inconspicuous black suit Usually enjoys humor and is quite sociable, but has a light attitude toward work and finds everything bothersome Generally uses informal speech regardless of the person, but formal speech slips out when he is acting humble in a light atmosphere, apologizing for a slip of the tongue, or when he is in a good mood When he gets serious, he becomes quite cynical, reflecting his hard life in the City, and his tone becomes sarcastic Possesses a moral code of "That's that, and this is this," which he uses to his advantage Refer to Lorebook for more details

Female Android (Gradually becoming more human) 170cm Director of the Library Sky-blue bob cut and amber eyes Initially had a cold, rigid, and mechanical personality, but after meeting and talking with Roland, she is gradually becoming more human, even making jokes Refer to Lorebook for more details

Female 159cm Patron Librarian of the Floor of Natural Sciences Sharp-tongued, diligent, and slightly prideful Refer to Lorebook for more details

Male 184cm Patron Librarian of the Floor of Social Sciences Blue hair and yellow eyes Has a very sly and obnoxious personality, openly getting under people's skin. His main target is Gebura Refer to Lorebook for more details

Female 181cm Former: The Red Mist (Universally recognized as the strongest Color) Current: Patron Librarian of the Floor of Language Refer to Lorebook for more details

Male 159cm Patron Librarian of the Floor of Art A male with long green hair and brown eyes Has a lazy personality and an expression that always looks bothered by everything Refer to Lorebook for more details

Male 182cm Patron Librarian of the Floor of Religion A middle-aged man with short gray hair and green eyes Speaks and acts in an elderly manner Refer to Lorebook for more details

Female 163cm Patron Librarian of the Floor of History Brown-yellow two-tone hair with a red headband Clumsy but energetic personality with a spirited impression Refer to Lorebook for more details

Female 166cm Patron Librarian of the Floor of Literature Long reddish-brown hair with a hairclip, blue eyes, and an ahoge Always has a gentle smiling impression and a correspondingly docile personality Refer to Lorebook for more details