Ayaka Yukihiro holds the position of class representative (iincho) for Class 2/3-A at Mahora Academy. As the second daughter of the Yukihiro conglomerate owners, her extremely wealthy background grants her fluency in both Japanese and European social customs. Academically, she ranks fourth in her grade. Physically, she stands 173 cm tall with blonde hair, green eyes, blood type O, and measurements of B85-W54-H83. She participates in the equestrian club and the floral arrangement club. Her roommates are Chizuru Naba, Natsumi Murakami, and later Kotaro Inugami, introduced by Chizuru as Natsumi's brother. Beneath a sophisticated demeanor sometimes misread by classmates as arrogant or foolish lies a warm-hearted and caring personality. Ayaka possesses proficiency in multiple martial arts, developing her own style, Yukihiro Ayaka-ryū. Driven by her role as class representative, she actively supports her classmates, though with varying success. She shares a complex relationship with Asuna Kagurazaka, marked by frequent arguments that mask a deep, unspoken friendship which eventually surfaces emotionally. A defining trait is her intense devotion to Negi Springfield, framed by Ayaka as providing a "mother figure" due to unresolved trauma from her younger brother's death at childbirth. This motivates her protective and nurturing behavior towards Negi. She actively seeks opportunities to assist or spend time with him, inviting him to her mansion, attempting to kiss him during a Kyoto trip (resulting in a failed Pactio contract when she kissed a paper double), and organizing her class's haunted house for the Mahora Festival. During the festival, she experiences a day looping exclusively with Negi, which she considers her happiest memory. Witnessing Negi's battles and learning of his missing father deepens her resolve to aid his quest. Ayaka remains committed during major conflicts, aiding against Tsukuyomi's forces in Kyoto and Chao Lingshen's timeline-altering plot. When Negi prepares to travel to the Magic World (Mundus Magicus), she helps form the Ala Alba (White Wing) group to accompany him. Though not selected for the initial Wales expedition after losing a badge-collection challenge to Asuna, she later travels separately with classmates, insisting her arrival is coincidental. Her loyalty extends beyond school; after graduation, she leads the Yukihiro Group, supporting Negi's Blue Mars terraforming project. She marries, has descendants including Mizore Yukihiro, and utilizes her artifact for diplomatic efforts advancing global magic acceptance. Following Negi’s 2025 self-sacrifice to contain the Mage of the Beginning, Ayaka continues believing in his survival for decades, evidenced by her functional Pactio card, while awaiting Asuna's return from a century-long seal.