Fai Fai, often called Fai, is the warrior of the hero's party. Raised in the forest, this background fuels her self-proclaimed title "King of the Forest" and shapes her wilderness-influenced behavior and skills. However, wildlife does not accept her as kin, necessitating caution against animal attacks during forest travels. She possesses blonde hair, yellow eyes, and a noticeably more developed physique than her peers. Her personality blends naivety with high energy, frequently showing affection towards friends. A defining obsession is food, marking her as a big eater capable of rapid, massive consumption. This hunger manifests unusually, such as occasionally nibbling her companion Seira's ears for comfort or when hungry, especially during sleep. Extreme hunger can trigger berserker-like behavior, causing her to gnaw on allies. Despite her intake, food shows no visible effect on her figure due to an implied hyperactive metabolism, though limits exist – consuming nearly forty melons in a contest caused significant abdominal bloating. In combat, she fulfills the warrior role through strength-based attacks, a duty complemented by her status as a wild leader. She actively participates in the party's adventures and battles, confronting threats like golems and spider monsters. During the final battle against the Demon Lord, she joined the collective effort to break the cyclical destiny binding heroes and demon lords, her actions helping dismantle this ancient conflict alongside the party. She shares a close bond with Seira, evidenced by the ear-nibbling habit and mutual quest participation, explicitly stating her love for Seira. As a core member of the group with Yusha, Seira, and Mei, she consistently demonstrates loyalty and teamwork, embracing their identity as true companions.