Ako Izumi holds student number 5 in Mahora Academy’s Class 3-A, characterized by light blue hair, red or amber eyes, and a height of 148 cm. She assists the school nurse despite a severe fear of blood and distaste for conflict, while managing the boys’ middle school soccer club and playing bass for the band Dekopin Rocket. Her closest companions are roommate Makie Sasaki, Yuna Akashi, and Akira Ookouchi. A large scar across her back, meticulously hidden, fuels deep insecurity and a belief it makes her unattractive, possibly linking to her blood phobia. Initially shy and viewing herself as a background figure, she gradually gains narrative prominence. During the Mahora Festival, she develops feelings for Negi Springfield’s older form ("Nagi") after he takes Age Deceiving Pills. Negi takes her on a confidence-building date, urging her to embrace a main-character role; they place second in the Mahora Best Couple Contest. She twice fails to confess her feelings, settling for his email address. Believing "Nagi" returned to England post-festival, she sends him photographs, including one in a bunny-girl outfit. In the Magic World, a critical illness leads Akira and Natsumi to sell themselves into slavery for her medicine. Rescued, Ako discovers Negi’s dual identity and offers her freedom to shield him from blackmail. She later initiates a Pactio with Negi’s true 10-year-old form, yielding the artifact "Cultrix Cum Traumate" (Worker With Trauma): a Mysterious Syringe that boosts abilities via injection or defensively injects poisons reversing senses and direction. Post-conflict, she masters healing magic, eradicating her scar entirely. After high school graduation, she trains as a first-grade healing practitioner in the Magic World. She ultimately works as a nurse alongside Akira Ookouchi while secretly studying under mentor Konoka Konoe. Her preferences include cute band-aids and doing laundry.