Tsukuyomi Komoe serves as a homeroom teacher at an Academy City high school, her youthful appearance—135 cm frame, pink hair, and wide-eyed gaze—belied by her adult lifestyle. She favors frilled dresses and playful accessories, yet her apartment reveals cluttered beer cans, cigarette packs, and neuropsychology textbooks. A chain-smoker consuming fivefold the cigarettes of colleague Yomikawa Aiho, she navigates the city in a compact, custom-modified car tailored to her stature. Rumors tie her agelessness to the Imaginary Number District, casting her as an urban legend linked to halted cellular aging—a theory Accelerator posits but remains unproven. A university graduate versed in Academy City’s Power Curriculum Program and esper development, she lacks personal psychic abilities yet once channeled a magic ritual under Index’s guidance, hinting at latent mystical aptitude. Komoe champions her students’ well-being with fervor, sheltering displaced youths like Himegami Aisa and Musujime Awaki while deploying unorthodox teaching strategies, including blindfolded poker games to incentivize learning. She harbors a bashful infatuation with former student Kamijou Touma, balancing professionalism with nostalgic admiration for his rebellious streak. Though nurturing, she bristles at remarks about her height, insisting on being labeled “cute.” Her influence threads through pivotal events: sheltering Touma and Index, aiding healing rituals, and dissecting esper mechanics during crises. At the Daihasei Festival, her tearful defense of students galvanizes their resolve. Later, she partners with Stiyl Magnus to heal Aisa post-attack, maintaining composure amid chaos. Exchanges with Accelerator and Last Order fuel speculation about her origins, which she casually deflects. From the Angel Fall incident—where a reporter temporarily inhabited her form—to confronting supernatural invaders during the Academy City Invasion arc, Komoe oscillates between maternal mediator and accidental combatant. Bunny-themed pajamas and comedic mishaps offset her gravitas, yet her steadfast dedication cements her as both a beloved educator and an inadvertent player in the city’s shadowed conflicts.