Chiriko is the youngest of the seven Celestial Warriors of Suzaku, appearing as a boy of thirteen years. His true name is Doukon Ou, and he is born under the star Extended Net. He comes from Jozen, a town in the western part of the fictional kingdom of Kōnan. When first encountered, Chiriko is not a seasoned fighter but a dedicated student, diligently studying for the rigorous examinations to become a government official. This scholarly background is the foundation of his personality; he is quiet, good-natured, and thoughtful, possessing a kind heart that balances his immense intellect.

The defining trait of Chiriko is his status as a genius, a quality that stems directly from his role as a Celestial Warrior. His extraordinary intelligence allows him to serve as a strategist and advisor, helping the group navigate complex problems. He notably uses a leaf as a flute or whistle, an instrument he employs against opponents to disrupt their attacks, as demonstrated when he countered the soundwaves of the Seiryū warrior Amiboshi. Beyond his mental gifts, his Celestial Warrior tattoo, the character for stretch, is located on his foot, and he possesses a magical writing scroll, the specific powers of which are mysterious and formidable.

Despite his genius-level mind, Chiriko is acutely aware of his physical limitations. As the youngest and physically weakest member of the group, he is sensitive about his small stature and his lack of traditional strength. A profound source of frustration for him is the nature of his own intelligence; his brilliance is a gift of his celestial role, and should that link fade, he would revert to being an average child with no special abilities. This precarious condition fuels his deep-seated desire to become a man of strength, to be valued for more than just his fleeting intellectual gifts.

Within the warrior band, one of Chiriko’s most significant relationships is with the boisterous bandit Tasuki. Despite their contrasting personalities, Tasuki happily adopts the role of an older brother figure to the boy, creating a strong and somewhat unusual bond that brings a protective warmth to Chiriko’s life. This relationship highlights his youth and the paternal care he receives from his comrades. His role in the story, however, is marked by profound tragedy. Chiriko meets his end when his body is possessed by Miboshi, a powerful warrior of the rival Seiryū Seven. In a final, courageous act that defines his character development, Chiriko regains control of his own body long enough to stab himself, a desperate and heroic sacrifice that kills both himself and his possessor, thereby saving his friends. In later narrative continuations, such as Fushigi Yūgi Eikoden, Chiriko is revived as a boy named Gakuren, the son of a politician. In this new life, he is unique among his companions for retaining the memories of his past identity, though he is under pressure to fully revive or fade away into a normal child without those recollections.