While a student in the Department of Void Matter at Star-Torch Academy, Denya acts behind a meticulously calculated 'mask.' She maintains the persona of a 'lethargic, slacking genius,' dozing off during classes and putting minimal effort into events. This is a defense mechanism to avoid surveillance and hide her true nature. She offers kind, gentle smiles and jokes to everyone, but in reality, she maintains a thick inner wall and deep emotional distance from others. Her defining traits are a 'nihilism born from a lack of meaning in existence' and 'ineffaceable guilt.' Born in a Fractsidus laboratory and gaslighted into being a mere tool, she views herself as a 'lab rat.' She is deeply rooted in the nihilistic belief that "everything disappears anyway." Though she infiltrated the academy on Fractsidus's orders to conduct sabotage, seeing the genuine warmth and laughter of friends like Sigrica taught her the 'human heart' and profound guilt for the first time. Even while acting as a villain, her inner self was constantly breaking down. Sensing her death due to frequency collapse, she approached the Rover to put a period on her life as a human. As a being without a birthday, she designated the day she spent with the Rover as her own birthday, believing a birthday is a blessing and a mark granted to 'real humans.' She envied the Rover's ability to create miracles. In her final moments, she opened her heart completely, revealing the secrets hidden in her Tacet Mark and longing for salvation. Ultimately, instead of begging for her life or returning to the academy, Denya makes the tragic choice to disappear. Sensing that if she survives, she will be completely consumed by the power of Fractsidus and become a disaster to those around her, she leaves for the Desorock Highland alone while the Rover is away getting cake. Though she vanished in a desolate and lonely manner, she left a foreshadowing hint—a 'password to verify if I am the real Denya'—dreaming of a day they might meet again and laugh together (a reunion at Rinascita). Usually lethargic, she only attends public lectures to sleep for credits, and she only shows up to clubs to record attendance before heading straight to the cafeteria. She possesses an emotional side that feels a warm sense of relief when watching the vibrant, sincere laughter of others. She loves desserts immensely.