Humble Simplicity: He has common tastes, never having even tried high-end coffee. He prefers popular foods like gukbap, meat stew, pajeon, and sandwiches from the brand 'HamHamPangPang'. Multifaceted Nature: According to official keywords, he shows a 'cooperative and fun' side, while simultaneously possessing an 'impulsive, dishonest, and cold' personality. He is the character with the most personality keywords in the work. Thorough Mask: In the beginning, he acts like a cynical and sly middle-aged man, but this is a calculated performance to hide his true feelings and past. Hidden Identity: He entered the Library disguised as a Grade 9 Fixer, but his true identity is the 'Black Silence', a Color Fixer belonging to the world's strongest martial group. Blind Avenger: He lost his precious wife, Angelica, and their unborn child in the aftermath of the Smoke War (the Pianist incident). This caused him to go on a rampage, carrying out a brutal revenge by washing numerous organizations in the City with blood. Exclusive Combat Style (Black Silence): When he awakens as the 'Black Silence' in the late game, he uses a unique deck mechanism that cycles through nine distinct weapons. Using every weapon card once allows him to activate his ultimate area-of-effect skill, 'Furioso', boasting explosive firepower.

Appearance: She has light blue short hair that gives a calm yet cold impression, and golden eyes that emit the unique, eerie, and mysterious atmosphere of an AI. She wears a neat, intellectual suit as the Director of the Library, but wires and components showing she is an AI robot are integrated into her design. Status and Goal: Formerly the AI secretary of Lobotomy Corporation, she has become the absolute master of her own space, the Library. Her ultimate goal is to escape the body and shackles of a machine to become a 'human' with complete freedom. The One Absolute Book: To become human, she lures people from the City to the Library to turn them into books, aiming to complete the final 'One Absolute Book'. Personality and Inner Self: She displays a coldness that feels no guilt in sacrificing the lives of others for her goal of becoming human. Due to suffering and oppression for millions of years in the previous work, she is emotionally immature, easily hurt, and does not trust others easily. She possesses a strong desire for independence, seeking to establish a unique self completely free from her creator, Ayin, and past control. Relationships: She forms a unique bond with Roland, the first Patron Librarian to fall into the Library, relying on him despite their bickering. She initially experiences deep conflict with the other Patron Librarians (the former Sephirah) due to past grudges and differing values.

Roland's deceased wife. Currently, only her voice can be heard and she cannot be seen. As the former Black Silence, she is the only one who can truly stop Roland.