(珠翠, Shusui) , Seiyū - Akemi Okamura

She is Shūrei's main lady-in-waiting and a well-known beauty of the Imperial Harem. Her beauty was said by Ryūki to can only be compared to Kocho, the famous courtesan in the Red Light District. She appears kind and caring to Shūrei, and also to Ryūki, but Ryūren was initially suspicious of her swift agility in handling with Kōrin's clumsiness. She was revealed to be an assassin and part of the Wolves of the Wind. Sa-Taihō had believed that she was an assassin loyal to him, but was actually working as a double agent under the orders of Shō-Taishi, the real master of the Black Wolf and Wolves of the Wind.

She is deeply fond of Shōka (who adopted her and sent her to the palace), but he doesn't seem to feel the same way. When she passed out, she called Shōka's name, which broke Shūuei's heart. Her feelings for Shōka is so strong that even at the mention of his name, she would snap out of a strong hypnotic trance by Hyō Ruka. She is also the only one who says Shōka's teas are delicious.

She was terribly bad at embroidery (something Ryūki likes to tease her for), but is somewhat improving. She made a handkerchief that she intended to have a sunflower-like floral pattern, but Shōka mistook it for a lion.

Shusui is shown to had attempted suicide as she is hearing sounds in her head and fears to be possessed and controlled by the Hyō clan. Later in the second season of the anime, it is revealed that she is actually from the Hyō clan and she was rescued by Shōka when he released Bara-hime. She was later adopted by Shōka and sent to the palace.

Source: Wikipedia