Shiryuu Chouun serves as Seito Academy's Special A-Rank fighter, commanding recognition for exceptional combat abilities despite limited demonstrations of her full potential. Standing 170 cm tall with measurements of 89-59-87, she possesses long silver hair covering her ears and forehead. Her eyes typically remain closed; when revealed, they display cat-like pupils, suggesting a controlled connection to dragon powers. Born August 4 under the Leo sign, her background directly ties her to the legendary Chinese general Zhao Yun. She inherits his title "The Eternal Victorious," reflecting his spear-fighting prowess and loyalty, which manifests in unmatched combat efficiency and unwavering dedication to Seito's leadership. Wielding the Youtou Muramasa blade "Zanryuu," she employs the technique "Shiden Issen" to defeat opponents like Teni and Kakouen Myosai effortlessly, often without visible strain or damage to her attire. Her fighting philosophy emphasizes avoiding unnecessary bloodshed despite lethal capability. Shiryuu displays a kind-hearted and loyal demeanor, particularly toward Gentoku Ryuubi and Koumei Shokatsuryou. She follows orders without question, explicitly stating willingness to die protecting Ryuubi. This loyalty extends to acknowledging Unchou Kan'u as Seito's strongest fighter despite their rivalry. A laid-back, almost detached attitude surfaces in non-combat scenes, highlighted by unsuccessful bonsai trimming and flower arranging, contrasting her battlefield precision. Narratively pivotal across arcs, she incapacitates Teni and Ryomou Shimei during the Dragon Jade incident, delivers the Jade to Kan'u, and later intervenes to contain Hakufu's rampaging dragon. Her actions frequently align with Koumei's covert directives, positioning her as Seito's tactical reserve. The "Xtreme Xecutor" season subtly develops her relationship with Ryuubi; ending sequences depict her blushing intensely while holding Ryuubi, implying unspoken romantic feelings that add complexity to her stoic loyalty. As part of Seito's Five Tiger Generals alongside Kan'u, Chouhi, Bachou, and Kanshou, she reinforces the group's collective strength. While her dragon affiliation remains ambiguously confirmed, visual cues like the cat-like eyes and a tiger tattoo on her shoulder blade hint at latent powers. Her character concludes without definitive resolution, maintaining an aura of mystery regarding her true limits and motivations.