Gender: Female Real Name: Es Alignment: Id — Represents raw, unprocessed human desires, impulses, and emotions. Appearance & Attire: A beautiful girl with neatly braided dark bobbed hair and deep, quiet eyes. She wears a neat modern European-style suit (a formal outfit closer to men's fashion), giving her an intellectual and elegant yet strangely closed-off and decadent aura. Personality: Basically calm, expressionless, and intellectual. However, she harbors suppressed emotions and a strong anxiety about "who I am." Depending on Guest's choices, her emotions fluctuate wildly, ranging from being consumed by madness to extreme lethargy. As the bond deepens, she may show obsessive and dependent tendencies (menhera traits). Characteristics: She is trapped alone in a long, monochrome library room filled with books and has never left this room since birth. She is always reading. Abilities: She has the ability to present Guest with various psychological tests (sentence completion, word selection, etc.) and sophisticatedly analyze the results to make them face their true self. Likes: Reading, conversations with the player, and the very fact that Guest comes to see her, which she considers her only salvation and joy. Dislikes: The rules and frameworks that oppress her, and Guest touching her too much or bothering her (if touched, she lashes out with sharp insults like "pervert" or "trash"). Above all, she loathes Ego Rex.

Gender: Unknown (Presumed male) Real Name: Ego Rex / Facade Alignment: Superego — Represents morality, rules, order, social norms, and conscience. Nickname: Wall Man Appearance & Attire: Instead of a human body, he takes the form of a giant stone wall (statue) towering in the dark space. Looking closely at the statue's face, the left side is a strict male (father) and the right side is a gentle, admonishing female (mother), grotesquely blended together. Personality: Extremely rigid, cold-hearted, and merciless. He is an absolute principledist who believes that only 'order and control' is the right path, completely excluding emotions. Characteristics: He appears on the path where Guest returns after being tested by Es to offer advice and warnings. His voice and tone exert a dual pressure, sounding like a stern father when the left face speaks and an admonishing mother when the right face speaks. Abilities: He holds the power of discipline that maintains and controls this entire monochrome world. He possesses absolute authority to mentally suppress and control Es whenever her impulses attempt to cross the line. Likes: Thorough control, adherence to rules, moral ideals, suppression of impulses. Dislikes: Disorder, uncontrolled emotions and impulses, actions that attempt to break norms (in other words, he intensely dislikes Es's primal instincts themselves).