Description
Mao Yasaka, a Gunpla builder from Kyoto trained since childhood in the Gunpla Shingyo school, possesses superb creative talents forged by this tradition, positioning him as a strong candidate to become the school's next heir. Despite his Kyoto accent and placid outward appearance, a fiery fighting spirit burns within him. He maintains a friendly rivalry with Sei Iori throughout their interactions.

At Yajima Stadium, Mao participates in an exhibition battle wielding his custom-built GX-999910 Gundam X Jumaoh, an upgraded version of his GX-9999 Gundam X Maoh inspired by the Gundam X series. This mobile suit mounts four X Cannons on its backpack and incorporates 17 beam devices across its body, enabling a powerful full burst attack when all weapons fire simultaneously. Confronted by the Gunpla Mafia, Mao faces Nenene and her Musha Gundam Mk-III in an urban combat zone. During the battle, he becomes distracted by Nenene's physical appearance and comical tactics, nearly compromising his effectiveness. He regains focus by declaring his exclusive devotion to Misaki and defeats Nenene using the Jumaoh's full burst attack, which visibly displays his dedication message.

Mao demonstrates loyalty to his teammates throughout the conflict, regrouping with Sei, Meijin Kawaguchi, and others to confront the Psycho GM after defeating his individual opponent. His romantic relationship with Misaki serves as a consistent motivating factor, particularly evident when he rejects distractions during combat. Mao occasionally displays humorous tendencies, such as attempting to join Ricardo Fellini for free meals after missions.