Chinkiyu Koudai is a character from the first anime season of Ikki Tousen. She is a student at Rakuyo High School and is known as the successor of the ancient strategist Chen Gong. Her birthday is December 28, and she possesses a C-rank fighter status. Physically, she is depicted with brown or orange hair and green eyes, typically wearing the standard red student blazer, red skirt, and knee-high socks of her school.

In terms of personality, Chinkiyu is defined by her profound and unwavering loyalty to her best friend, the powerful fighter Ryofu Housen. Her entire existence seems to revolve around Ryofu’s well-being and happiness, and she is willing to risk her own life to ensure it. This devotion manifests as a protective and sometimes desperate nature, as she constantly worries about threats to Ryofu and seeks ways to elevate her above her rivals. Her feelings for Ryofu go beyond simple friendship, as she shares an intimate romantic relationship with her.

Chinkiyu's primary motivation is to see Ryofu acknowledged as the number one fighter, free from being second best to anyone. This desire drives her actions throughout her role in the story. As a supporting character, her actions are the catalyst for a major tragic turn in the first anime series. Frustrated with Ryofu's position and seeking to present her with a meaningful gift, Chinkiyu decides to steal the mystical jewel known as the Gyokuji on her own accord. Her attempt to steal the jewel for Ryofu goes disastrously wrong, leading to her capture by a rival student, Bunwa Kaku. As punishment, Kaku orders one of his fighters to brutally assault and violate Chinkiyu. She is later rescued by Ryofu and taken to a hospital, but she ultimately succumbs to her severe injuries. In her final moments, she reveals her intention was to make Ryofu feel like she was number one, and she dies from her wounds.

Her most significant and only true relationship is with Ryofu Housen. She acts as Ryofu's strategist, confidante, and lover, constantly begging her to cut ties with dangerous elements like the fighter Saji to protect her from the tyrannical leader Chuuei Toutaku. Her personal development is tragically cut short, as her story is not one of growth but of fatal devotion. Her loving and loyal nature directly leads to her taking a reckless risk that results in her death, cementing her role as a sacrificial figure whose demise deeply impacts Ryofu.

Regarding her abilities, Chinkiyu is noted as a C-rank fighter, indicating she possesses some fighting potential but is not among the elite warriors in the series. Her most notable combat technique is a signature move known as the Chinkyuu Kick, a powerful flying kick that serves as her primary offensive ability. Despite her rank, her skills are ultimately no match for the more ruthless fighters she encounters, leading to her tragic end.