Moutoku Sousou began as a common fighter who endured severe childhood bullying. Training alongside Chuukou Kyocho at their shared dojo, he relied on her defense against tormentors until witnessing her assault by male peers. This trauma ignited his first dragon awakening, killing the attackers and sparking an enduring battle against violent internal impulses. His later killing of Bunyaku Kansui provoked Mouki Bachou's vengeful pursuit. As leader of Kyosho Academy, Sousou maintained close ties to Genjou Kakouton and Hokou Kakuka. Early series portrayals showed him lethargic, frequently sleeping through tournaments yet commanding respect as a B-ranked fighter. His initial long dark brown hair, unbuttoned shirt, rolled-up black pants, and bare feet shifted in the second season to crimson hair and yellow eyes—reflecting his deepening dragon symbiosis. Personality changes emerged as the dragon's influence grew. Initially detached and lazy, Sousou revealed profound inner turmoil, fighting the dragon's bloodlust while craving dominance over formidable opponents like Unchou Kan-u over artifacts such as the Gyokuji. He strategically accepted the Gyokuji from Bunwa Kaku to found the Wei Kingdom but prioritized subduing rivals. Violent escalations defined key arcs. In *Dragon Destiny*, Sousou executed Koshaji for injuring Kakouton, then ordered Yoshu Academy's destruction. He killed Bonsoku Ukin for insubordination and later targeted Kakouton as a traitor after Kan-u's release. Kan-u's presence intensified his dragon's instability, culminating in Sousou's chained imprisonment beneath Kyosho Academy, where Kyocho temporarily stabilized him with chi. He granted power to Chuutatsu Shibai but doubted her loyalty. The Battle of Red Cliffs became pivotal: drawn by his dragon's hunger to confront Gentoku Ryuubi and Hakufu Sonsaku, Sousou fused with Shibai's abilities. He overwhelmed Ryuubi and nearly consumed her dragon before Hakufu—now mastering her own dragon—intervened. Their combined water and lightning dragons defeated him. Presumed dead, Sousou resurfaced in *Great Guardians*, comforting Kakouen Myousai and revealing lingering allegiance. No confirmed details exist for his role in *Xtreme Xecutor*.