Rei Batsubami, once a member of the Hundred Devouring Families, was exiled following internal clan strife. Born into a disgraced branch family stripped of status, she endured dehumanizing servitude, treated as livestock for higher-ranking members. A transformative encounter with Yumeko Jabami’s sister altered her path; the woman’s kindness and gift of a dragonfly brooch ignited Rei’s resolve to avenge her after the sister’s demise in a clan conflict. Initially presenting as androgynous at Hyakkaou Private Academy, Rei wore a male uniform, maintaining a subdued, courteous facade as a clan servant. Her short light-brown hair fell into long bangs concealing one eye, paired with glasses and white gloves that hid hand tattoos—permanent marks of the Batsubami outcasts, signifying the erasure of her name and humanity. Behind her unassuming demeanor lay a calculating strategist quietly undermining the clan’s power structure. Her ambitions sharpened during the student council elections, where she orchestrated the 100 Vote Auction, exploiting debts from students she’d covertly assisted to amass political capital. At the auction’s climax, she discarded her glasses and gloves, unveiling her tattoos and shedding her meek persona. When Yumeko Jabami disrupted her scheme, Rei wagered her family name in a fatalistic coin toss. Defeat cost her the Batsubami identity, but her tenacity captivated Kirari Momobami, who reinstated her into the clan under a new name. Post-redemption, Rei embraced a feminine aesthetic, swapping uniforms and styling her hair intricately. She abandoned glasses for pink lipstick, reflecting her self-acceptance. Actions like shielding bullied peers and bonding with Ryota Suzui revealed her empathy, contrasting the clan’s cutthroat norms. Though composed, she occasionally faltered when faced with kindness or echoes of her traumatic past. Rei’s gender expression shifted dynamically, transitioning from male-presenting to openly feminine. Her androgynous features and fluid identity sparked interpretations of gender nonconformity, mirroring her internal struggle to reconcile selfhood after years of systemic dehumanization. Her arc culminated in reclaimed autonomy, epitomized by the enduring presence of the dragonfly brooch—a silent emblem of her bond with Yumeko’s sister.