Asuna Kagurazaka, bearing aliases including Asuna Vesperina Theotanasia Entheofushia, Baka Red, Twilight Imperial Princess, and Bellatrix Sauciata, presents physically as a teenager with orange hair and heterochromia—typically a blue left eye and green right eye. She stands 163 cm tall with specific measurements. Her recorded birthdate is April 21, 1988, though her true age exceeds 100 years; temporal displacement and memory sealing maintain her physical age at approximately 15. An orphan sponsored into Mahora Academy by the dean, she delivers newspapers to contribute expenses despite waived tuition. Academically challenged, especially in English, she belongs to the "Baka Rangers." Childhood memory erasure by Takahata fuels her struggles, though dreams triggered by meeting Negi Springfield cause these memories to resurface gradually. Her personality blends impulsiveness, fierce protectiveness toward loved ones, and a short temper—particularly against perceived perverts or children—yet reveals maturity in ethical choices. She nurses crushes on older men, notably former teacher Takahata, while her dynamic with Negi shifts from initial hostility to a deeply bonded, sisterly relationship. Romantic implications toward Negi remain ambiguous but occasionally hinted. Biologically, she is the Imperial Princess of Twilight from the fallen Vespertatia Kingdom in the Magical World, cousin to Queen Arika Anarchia Entheofushia and thus Negi’s aunt. Her innate magic-canceling ability, pivotal in Ostia’s downfall, manifests as anti-magic fields and spell negation. Forming the first probationary contract (Pactio) with Negi grants her the artifact "Ensis Exorcizans," materializing as a harisen or massive sword to amplify her cancellation power. She also masters Kankahō, a ki-magic fusion enhancing physical prowess. Her journey begins upon discovering Negi’s magic, forging their partnership during conflicts against foes like Evangeline and Fate Averruncus. Restored memories reveal her origins and connection to Negi’s father, Nagi Springfield, her savior long ago. Throughout the Magical World saga, she confronts her heritage and abilities, culminating in her duty to stabilize the dimensional gateway between Earth and the Magical World. This requires a century-long stasis sleep to maintain equilibrium, separating her from classmates until a future reunion. Her arc transitions from comedic foil to a figure embracing destiny, emphasizing sacrifice and legacy.