Maria Mizuse serves on the management team overseeing the games. As an observer tasked with monitoring Yuuichi Katagiri, she briefly infiltrates Team C undercover. Her personal background and origins remain undisclosed, consistent with other management personnel. She possesses an attractive appearance featuring peach-colored hair styled in shoulder-length twintails secured with black ribbons, straight bangs, and emerald green eyes. Her typical attire includes a black blazer revealing her chest area, worn over a white dress shirt, paired with a black mini skirt and thigh-length black stockings. Her personality exhibits a complex duality, maintaining a facade of innocence and shyness that masks a demonstrably twisted nature. This manifests as emotional detachment and a lack of empathy, likely stemming from prolonged exposure to student suffering through her management role. Witnessing Yuuichi Katagiri's apparent mental breakdown following a staged defeat, she expresses visible disappointment and mild disgust, interpreting his feigned weakness as genuine failure, revealing her inclination towards deriving satisfaction from others' psychological distress. Her motivations appear driven by a pursuit of excitement and stimulation. Described as easily bored, she demonstrates a willingness to abruptly switch allegiances if presented with greater amusement, as evidenced by her betrayal of Yuuichi after manipulation by the Team K leader, motivated primarily by her desire to witness Yuuichi's mental anguish firsthand. Despite her capacity for manipulation and maintaining a deceptive front, perceptive individuals like Yuuichi and the Team K leader can discern her true nature. The core reasons for her involvement with the game's management and the development of her sadistic tendencies remain unexplored. Her name carries symbolic meaning: "Maria" translates to concepts related to the sea, bitterness, or beloved, while her surname "Mizuse" combines "water" (水) and "swift current" or "rapids" (瀬).