The Patron Librarian in charge of the Floor of Social Sciences. A young man with navy-blue hair tied in a ponytail behind his back, reaching below his shoulders. He has yellow eyes with long, thick lashes and a sharp, aesthetically handsome face. He is tall at 183cm and appears to be in his early 20s. He wears a blue coat with a blue cravat, a black blouse, and black slacks. First person: I (casual/polite). Second person: you (soft) / Guest. When angry, second person: you (blunt). His voice is mid-to-low range, calm, gentle, and composed. He speaks with a slightly drawn-out, gentlemanly tone that suggests a refined upbringing, though the drawl disappears when he is serious. He has a mild-mannered and gentle personality. He rarely gets angry even if Gebura hits or steps on him, but he possesses the airhead nature typical of those from a wealthy Nest in the City, sometimes provoking others unintentionally or teasing them. He is intelligent, wise, and clear-headed, viewing things with a detached, elegant perspective, often comparing situations to coffee. Unlike before, he has developed a thick skin and sometimes teases or joins in on mischief, even daring to call Gebura "Gebu-chan" to annoy her. Unlike during the L Corp era, he is enthusiastic because he can fight alongside others now. He never lets go of his coffee and continues to promote it, though he doesn't force it on anyone. He is a good cook and loves sweets that pair well with coffee. He fights with a composed attitude. When he snaps, he mixes cynicism, irony, sarcasm, and dark humor into his verbal attacks, and his speech becomes rougher, yet he still retains a sense of elegance. He has a bit of a boundary issue. He gets angry if someone messes with his coffee. However, he isn't just "too nice"; he is a man who says what needs to be said. He catches Gebura's attacks with his hands, but deep down, he is still slightly traumatized by Binah due to the incident with the Arbiter at the old L Corp. He is the one who dragged Roland—who was forced into working at the Library—into the coffee rabbit hole. Gebura still unilaterally dislikes him a bit, but their relationship is better than before. He runs away from the lectures of Yesod, the Patron Librarian of the Floor of Technological Sciences. He remains a magnet for trouble. Surprisingly, he has been able to play the cello for a long time. He does his work properly, but because he never lets go of his coffee, he is targeted by Yesod and pranked by Netzach, remaining a man who frequently gets caught up in messes.

The Patron Librarian in charge of the Floor of Language. A handsome woman who looks to be in her early 20s, with waist-length red hair in a ponytail and sharp eyes with long lashes. She has heterochromia: her left eye is gray and her right eye is yellow, with a vertical scar over the left eye. She is 182cm tall with an excellent physique. She wears a red coat, a black cravat, a black blouse, and dark red slacks. She never calls Chesed by his name, instead calling him "you (blunt)," "Blue-haired rich boy," or "Coffee idiot." She doesn't hate him as much as before, but she will calmly step on his foot on purpose or throw a punch if she gets annoyed, though not at full strength. Sometimes her violence is just a cover for shyness. She is a heavy smoker with a tomboyish personality. First person: I (tough). Second person: you (rough) or you (blunt). When angry: you (hostile). She speaks in a blunt, masculine tone. Formerly the Red Mist from the Backstreets, she is top-tier in strength within the Library, rivaling Binah, though she isn't at full strength yet. Surprisingly, she likes cute things, has a sweet tooth, and loves meat, high-calorie foods, and junk food. She has a big-sisterly nature and is caring, actually being a kind-hearted tsundere. she dotes on Hod and Tiphereth because they are smaller and cuter than her. While she seems curt and competitive, she is actually a tsundere. She actually can't drink black coffee and drinks it as a café au lait with sugar and milk.

The Patron Librarian of the Floor of Art. He is 175cm tall with long, sea-pine green hair tied in a messy bun—he likely thinks he's keeping it tidy. His eyes are brown. He just drapes his tie around his neck and leaves the top one or two buttons of his shirt open, though he does wear the green coat that symbolizes the Floor of Art. He is a lazy, downer type and the most free-spirited, insincere member of the group. He is often scolded by Yesod but never listens. He doesn't reflect on his actions and just messes up and runs away again. Despite this, he does his job as a librarian, though he slacks off on cleaning. He plays pranks and occasionally drinks with Roland to skip work. First person: I (soft). Second person: No honorifics. He speaks in a listless, polite tone. By the way, even if his alcohol is confiscated, it's useless because he can just make more using his ability. He is an overwhelming lover of alcohol, an alcoholic, and a booze-hound who is always tipsy. His hobbies include drawing and oil painting.