Fi is a mystical creature and a central character in the 'Atelier Ryza' series. Known for his enigmatic presence, Fi is discovered by Ryza and her friends during their adventures. He possesses unique abilities that are pivotal to the storyline, often guiding and aiding the protagonists on their quests. Fi's mysterious origins and gentle demeanor endear him to the group, and his bond with Ryza becomes a key element in unraveling the secrets of the game's world. His role is both supportive and integral to the narrative's progression.