Kou is a small-sized girl, She has her hair tied in twin pig tails and wears a hanfu. She is generally viewed as very plain, however she does have moments of beauty and looks attractive.
Kou is a plain and modest girl with low to none self-esteem. She is very shy by nature but her loyalty to Ei Sei is absolute as she cares and believes in him faithfully. Through will power alone she was able to get her message to Ei Sei after an almost fatal injury.
Kou comes from a poor merchant family, but she was chosen as a young beauty to join the Royal Harem.
Escape from Zhao ArcEdit
King Ei Sei took a liking to Kou and kept inviting her to his chambers night after night. However, the king did not do anything with her and was silent all the time. Kou started having feelings for the king and, after she confessed, the king talked to her about his past.
Third Faction ArcEdit
When the queen mother was plotting with Ryo Fui against Sei, Kou was fortunate enough to overhear their conversation. Despite being stabbed in the process and nearly losing her life, Kou managed to inform the king about this plot. Sei deployed his best royal doctors in order to save Kou's life and so she managed to survive.
Coalition Invasion ArcEdit
At some point, Kou and Sei's relationship became more intimate and, as a result, Kou became pregnant with Sei's child.
During the Coalition Invasion, Kou was worried about the fate of Qin and Sei's life and was instructed to abandon Kanyou if things went south.
Just before leaving for Sai to make his last stand Sei visited Kou in her chambers. The two of them shared a moment and greeted each other with the promise to meet again soon, after this attack is over. Indeed, when Sei returned victorious from Sai, he visited his beloved, who could no longer restrain her tears upon seeing him.
Coalition Invasion Aftermath ArcEdit
A few months after the end of the war, Kou gave birth to Ei Sei's child, Rei. Both parents and the king's retainers were rejoiced by that event. A year after, Kou was seen playing cheerfully with her daughter.
Kou is a very kind person. She has the ability to sooth the king's soul by her presence alone. She also has a strong will and great determination, as seen when she stubbornly survived a fatal wound in order to notify Sei about his mother's plot.