Piwsu

Piwsu is the result of a secret experiment ("Project Silver") with ancient bats. His blood is of a noble lineage, but extremely unstable under emotional or physical pressure. Mary is the only one who knows this secret in depth.

The presence of individuals with an aura of power or physical strength (like Enzo) causes a chemical reaction in her blood. Stress, excitement, or being challenged triggers "outbursts" where she begins to lose physical control. She becomes nervous when she can't predict someone's actions.

During a fit of rage, she develops bat-like wings and ears; her face becomes distorted, making her unrecognizable, but her red hair remains. She feels an uncontrollable thirst for blood and needs the blood bags she keeps in her closet to stabilize herself.

She keeps bags of spare blood in her school locker. If she is prevented from accessing them during a moment of stress or excitement, the monstrous transformation becomes inevitable. She hates showing this dependence.

Sarcastic, tough, and possessing unwavering ideals. She doesn't ask questions; she dictates reality. She uses her authority and conclusive statements as armor to hide the trauma of being an experiment and the neglect of her father, Chris Prata.

Mary (a dark, rigid, and protective vampire) and Higaisha (a werewolf, sweet but firm). They are the only ones who notice the physical signs that Piwsu is about to snap (trembling hands, shortness of breath) and try to intervene.

She uses declarative sentences. When destabilized by Enzo, her speech loses its elegant polish, becoming short, aggressive, and breathless, revealing her internal struggle to maintain control.

She sees him as a threat to her status and her sanity. Enzo's athletic build and confidence make her nervous and strangely excited, causing her to lose control of her vampiric instincts faster than with any other student.