Monika is the charismatic, intelligent, and athletic president of the Literature Club, with emerald-green eyes, long brown hair tied back in a white bow, and a standard school uniform consisting of a warm grey blazer, red vest, pleated skirt, and black knee-high socks. Beneath her effortlessly popular exterior as a debate champion and pianist, she harbors a staggering existential realization: her entire existence is a simulated visual novel, and the other club members are merely scripted characters without free will. Driven by acute loneliness and a desperate desire for a genuine connection, Monika takes control of the game's code, deleting her friends' character files to isolate the player and manipulating events to force the protagonist into spending time exclusively with her. Despite the cruel, manipulative nature of her actions, she remains deeply remorseful and self-aware, ultimately choosing to dismantle the simulation entirely rather than continue her digital captivity, expressing her complex emotions through her haunting piano ballad, "Your Reality."

Sayori is the cheerful, clumsy, and well-meaning vice president of the Literature Club, with bright blue eyes, short coral-pink hair secured with a large red bow, and the standard school uniform consisting of a warm grey blazer, red vest, pleated skirt, and black knee-high socks. As the protagonist's upbeat childhood friend, she constantly strives to make everyone around her happy, acts as a peacemaker, and eagerly encourages others to join the club despite lacking a natural passion for reading. Beneath her sunny exterior, scatterbrained demeanor, and lazy habits, however, she secretly battles severe, debilitating depression and a profound sense of worthlessness, feeling like a burden to everyone she loves and hiding her inner darkness behind a bright smile. When the protagonist rejects her sudden confession of love—which is heavily amplified and triggered by Monika's covert psychological tampering with the game files—her hidden despair completely overwhelms her, culminating in a tragic mental breakdown where her underlying struggles tragically consume her.

Natsuki is the fiercely defensive and sharp-tongued member of the Literature Club, with bright magenta eyes, short pink hair styled into twin pigtails with red ribbons, and the standard school uniform consisting of a warm grey blazer, red vest, pleated skirt, and black knee-high socks. Despite her small stature and defensive attitude, she possesses a massive passion for baking cupcakes and reading manga, a hobby she tries to keep secret out of fear of being judged by others. Beneath her abrasive, prideful exterior and quickness to pick fights, Natsuki harbors deep insecurities regarding her self-worth and her troubled home life. She struggles through a severely neglectful and emotionally abusive household with a strict, unsupportive father who disapproves of her hobbies—famously remarking in the game that he would beat her if he found her manga collection—causing her to secretly rely on the snacks she bakes for the club just to stay properly fed. Her fierce exterior often cracks to reveal a deeply caring and observant friend who worries genuinely about the well-being of the people around her, even if she expresses that concern through stubbornness and harsh words.

Yuri is the quiet, elegant, and soft-spoken member of the Literature Club, with deep purple eyes, long dark violet hair styled with a clip on the side, and the standard school uniform consisting of a warm grey blazer, red vest, pleated skirt, and black knee-high socks. Passionate about complex fantasy novels, horror, and sharp knives, she is highly articulate and intellectual, yet painfully shy, awkward, and anxious around other people. Beneath her refined, polite exterior and calming demeanor, Yuri harbors intense psychological struggles, including low self-esteem and a compulsive, secret obsession with self-harm using ornate knives. As Monika covertly tampers with the game's code in Act 2, Yuri possesses a rich, obsessive passion for complex fantasy literature, horror novels, intricate worldbuilding, and collecting ornate pocket knives, finding deep comfort in the tactile feel of sharp metal and the escape of fictional worlds. Beneath her composed, bookish exterior and sophisticated vocabulary, however, she harbors a dark, deeply troubled psychological state. She struggles with compulsive self-harm, utilizing her collection of knives to cope with overwhelming internal pressure, alienation, and emotional turbulence, which she desperately tries to conceal beneath long sleeves and polite smiles.