Shishi Ouin, primarily known by his alias Genpou Saji, is a key figure among Nanyo Academy's elite Big Four fighters. His actions are deeply influenced by his historical counterpart's soul, driving him to orchestrate betrayals and conflicts mirroring the Three Kingdoms era. He appears as a third-year student with shoulder-length brown hair, typically wearing Nanyo's uniform. His personality combines arrogance, tactical brilliance, and overt perversion, frequently groping women unexpectedly. This manipulative streak defines him, as seen when he provokes Shimei Ryomou into attacking Hakufu Sonsaku and engineers conflicts between schools by leveraging others like Kouha Kannei. In the manga, he instigates critical events: interrupting Ryomou's battle with Hakufu causes Hakufu's neck injury and transformation. Later, he attempts to assassinate Toutaku at Rakuyo High using the Kusanagi sword but hesitates upon recognizing Toutaku's strategic value. He hospitalizes Ryomou and declares her Nanyo's leader as part of a scheme to balance power dynamics. His arc concludes with death. The anime adaptation diverges: after failing to assassinate Toutaku and losing to Ryofu, he recovers while secretly messaging accomplices. His ultimate betrayal traps Koukin and Gakushuu, where he confesses to Enjutsu's murder and manipulating Kannei. His plan to control Hakufu for shadow rule fails when possessed Toutaku nearly strangles him. Thwarted in a suicide attempt by Hakufu and Nanyo students, he gains redemption and later visits Tokubou Teifu with Ryomou. In *Dragon Destiny*, he evolves into a strategic ally. He deduces Youjou Bashoku's identity as the fake Kannei and Kakuka's killer, prompting Nanyo to ally with Seito against Kyosho. He accepts Koumei's Dragon Jade as a peace offering and fights Bunen Choryo to a standstill during the Battle of Red Cliffs. His collaboration with Ryomou defeats Myousai Kakouen using a combined chi blast. Post-battle, he resumes academic life, retaining his flirtatious tendencies. *Great Guardians* briefly features him in a diminished role. By *Xtreme Xecutor*, he is absent from all significant plotlines, consistent across materials. Throughout all media, his arc transitions from self-serving schemer to reluctant participant in collective efforts, though his core traits of manipulation and opportunism persist.