Chou'un Shiryuu is a Special A-Rank fighter at Seito Academy and the successor to Chinese general Zhao Yun, inheriting the title "The Eternal Victorious" through her combat skill. She possesses long silver hair covering her ears and typically keeps her eyes closed. Her distinctive attire includes a brown vest over a striped white collared shirt, a dark brown skirt with red stripes, knee-high black socks, and brown loafers. She stands 170 cm tall with measurements of 89/59/87, born on August 4 under the Leo sign. In battle, Shiryuu wields the Youtou Muramasa sword "Zanryuu" and employs the "Shiden Issen" technique. Recognized among Seito's strongest, she effortlessly defeated high-ranking opponents like Kakouen Myosai while simultaneously protecting Gentoku Ryuubi from assassins. Operating under Koumei Shokatsuryou's orders, she participated in critical missions including retrieving the Dragon Jade. During this mission, she defeated Teni following Teni's battle with Shimei Ryomou, acknowledging Ryomou's fatigue aided her victory, and later delivered the Dragon Jade to Unchou Kan-u. Personality-wise, Shiryuu demonstrates unwavering loyalty to Seito and Koumei, following orders without question. She expresses readiness to sacrifice her life protecting Gentoku Ryuubi, with blushing while holding Ryuubi hinting at deeper feelings. Despite her power, she maintains a laid-back demeanor and avoids unnecessary violence. Outside combat, she engages in activities like bonsai trimming, though with limited success. She is one of Gentoku Ryuubi's "Five Tiger Generals" alongside Unchou Kan-u and others. Her dragon affiliation remains undefined, though glimpses of cat-like eyes during fights and a tiger tattoo on her shoulder blade suggest a potential connection. She interacts with allies like Kan-u, whom she respects as a rival, and assisted Ryomou by transporting her to safety post-battle.