Ayaka Yukihiro holds student number 29 and serves as class representative of Mahora Academy's Class 2/3-A. Born into extreme wealth as the second daughter of the Yukihiro zaibatsu family, she navigates Japanese and European social customs with ease. Her physical traits include 173 cm height, B85-W54-H83 measurements, blonde hair, green eyes, and blood type O, with a July 5, 1988 birthday. She exhibits strong leadership and academic excellence, consistently ranking among her grade's top students—most recently fourth—yet displays naivete toward supernatural occurrences, causing peers to underestimate her. As class representative, she maintains order and addresses peer concerns with variable effectiveness, notably communicating well with the silent Zazie Rainyday. Ayaka practices martial arts intensely, developing her personalized "Yukihiro Ayaka-ryū" style. Though initially perceived as spoiled, she reveals genuine warmth and assertiveness tempered by vulnerability. Her dedication centers on supporting teacher Negi Springfield, fueled by childhood trauma from her unnamed brother's death at birth. This void drives her maternal fixation on Negi, prompting open concern for his welfare and active assistance in his quest to find his missing father. She shares a contentious yet deeply caring friendship with Asuna Kagurazaka, marked by frequent arguments that resolve in emotional reconciliations. Ayaka clashes with Kotaro Inugami, whom she considers Negi's disrespectful opposite. Her roommates are Chizuru Naba, Natsumi Murakami, and later Kotaro (posing as Natsumi's brother). She participates in equestrian and floral arrangement clubs. Key developments include organizing class activities like the Mahora Festival haunted house, enduring mental strain but cherishing a time-loop experience alone with Negi. She attempted a Pactio contract with him via a paper replica kiss in Kyoto, resulting in a flawed artifact card. Ayaka led classmates to witness Negi's Mahora Martial Arts Tournament matches; learning of his father's disappearance there intensified her loyalty. She provided intelligence on his father's location but failed to secure a spot on Negi's Wales expedition team. Traveling separately to England under vacation pretenses, she followed Negi to Wales, bonded with his cousin Nekane, and refrained from the Magic World mission per Evangeline's orders—a decision that likely spared her given her combat limitations. She continued supporting Negi remotely by gathering intelligence about his father during his absence. Ayaka coordinated event changes for Negi during the Mahora Festival's third day, aided cyberspace defense against Chao Lingshen, and pursued rumors about a book predicting Negi's future marriage partner.