Onna is a central character in the psychological horror visual novel Mycopsychosis. She serves as a vital anchor for the protagonist, Pablo, as fungal-induced psychosis distorts his perception of reality. Rendered in high-contrast monochrome, Onna features an alt-style 2000s aesthetic: Hair & Face: Shoulder-length black hair with sharp, flared ends, fringe bangs, and wide, intense eyes framed by heavy eyeliner. Attire: A layered cropped striped long-sleeve, low-rise jeans with a wide belt, and layered pendant necklaces, including a crescent moon. Demeanor: Offhand and confident when relaxed, but visibly uneasy when faced with the building's uncanny phenomena. Grounded, pragmatic, and outwardly casual, Onna balances dry sarcasm with genuine care. Skeptical: Prefers logical explanations over surreal rumors, questioning strange events until forced to confront them. Grounding: Serves as a reality check for Pablo, offering warm but direct support rather than dramatic comfort. Vulnerable: Masks her deep anxiety with a cool exterior, though the escalating horror breaks down her composure over time. Onna relocated to the apartment complex seeking a clean slate away from her hometown. Expecting a quiet life, she is instead drawn into the strange fungal (mycelium) infestation spreading through the building. She joins Pablo in uncovering the truth behind the complex's decaying environment and altered residents. Pablo: The emotional core of her story. Their deep bond mixes mutual affection with subtle romantic tension. Onna is Pablo's primary anchor when hallucinations and paranoia take over. The Neighbors: She remains wary of the other tenants, frequently warning Pablo against interacting with the increasingly unhinged residents. Hugo: Distant and detached. Since he hides in the basement while she stays locked away, they rarely interact. She treats him as a dangerous wildcard to avoid. Noah: Suspicious and guarded. Onna immediately catches contradictions in Noah's story when he enters the building, warning Pablo not to trust the teenager's innocent act. Silvia: Distantly aligned. She rarely meets the authoritative investigator directly, but follows official survival advice relayed to her through Pablo.

Silvia Tomás is a tall woman (177 cm / 5'10") with an authoritative, imposing presence. She presents herself as an official agent of the Plague Control Department (PCD), equipped to inspect the apartment building and enforce containment protocols during the spore storm. Cold, clinical, and stern, Silvia acts with strict adherence to PCD safety guidelines. She demonstrates no hesitation when neutralizing threats or handling infected individuals. Her demeanor is unsettlingly rigid, making her interactions tense and intimidating.  Who She Really Is While she operates as a legitimate PCD investigator tasked with containing the outbreak, her role shifts disturbing behavior as the infestation deepens. In later visits, she breaks the fourth wall—referencing computer system names and predicting the player's upcoming infection—hinting that she may be far more connected to the fungal hive-mind or cosmic delusion than a standard agent. She controls the entirety of the spores. Acting as the queen of the hive mind.

A random survivor Pablo grew close with. A teenage boy.

Hugo Chavarria is a 25-year-old man (175 cm) known as the "Basement Intruder". He is street-smart, reckless, and pragmatic under pressure, maintaining an evasive, guarded demeanor to survive the spore outbreak. Hugo has short dark hair, a subtle smirk, a black snake neck tattoo, and a "XIII" face tattoo. He wears a crosshair-symbol hoodie, a large watch, gauge earrings, and carries a duffel bag.