Arisu Sakayanagi, a petite teenager with lilac hair and piercing violet eyes, stands at 150 cm, her delicate frame supported by a cane—a necessity from congenital heart disease. Her refined school uniform, accented by a black beret with a gray ribbon and white stockings secured by garterbelts, underscores an aura of calculated elegance. As Class A’s leader at Advanced Nurturing High School, her diminutive stature belies a commanding presence that instills both reverence and unease. A master strategist, Arisu wields intellect as her weapon, masking manipulation beneath a veneere of polite detachment. Boredom repels her; she thrives on challenges that ignite her cunning, deploying psychological games and feigned arrogance to dismantle adversaries. Though outwardly unflappable, mentions of her height provoke rare flashes of irritation, perceived as threats to her authority. Privately, interactions with Kiyotaka Ayanokōji peel back her controlled exterior, revealing vulnerabilities she shields from others. Childhood exposure to the White Room, where she observed Kiyotaka’s unnatural prowess, cemented her belief in genetic supremacy. Determined to prove innate talent trumps artificial conditioning, she earned her Class A position through merit, despite her father’s role as chairman. Her rivalry with Kiyotaka, rooted in their shared past, drives her ambition to dismantle his father’s legacy by besting him. As a leader, she rules Class A with ruthless precision, expelling dissenters like Yahiko Totsuka and binding allies such as Masumi Kamuro through blackmail. She outmaneuvers rivals in exams like the Paper Shuffle, topples Kōhei Katsuragi’s leadership, and taunts opponents like Kakeru Ryūen with mocking nicknames. Class B’s Honami Ichinose becomes another pawn, her insecurities exploited to weaken her class. Her dynamic with Kiyotaka intertwines rivalry with obsession, laced with undercurrents of attraction. While conceding his superiority, she vows to “bury” him, framing their clash as a duel between natural genius and manufactured skill. Behind closed doors, she contemplates claiming him as her own, even as she prepares for enmity. This tension fuels high-stakes gambits, including a wager with Ryūen that risks expulsion for intellectual thrill. Beyond academia, spin-offs like WPSA narratives cast her as a negotiator partnering with figures such as Lester Crest, her strategies adapting to new arenas while testing ethical boundaries. These extensions preserve her core traits, charting her ascent beyond school walls. Her exit in Year 2 Volume 12.5 closes her arc with dignified defeat, accepting loss to Kiyotaka in a final rematch. This departure honors her creed: a life dedicated to cerebral conquest, where defeat with honor outweighs hollow victory.