Shimei Ryomou is an 18-year-old third-year student at Nanyo Academy, standing 160 cm tall with measurements of 85-58-86. Recognized as one of the school's top fighters and part of the elite Big Four, she ranks second only to Saji. Her appearance features short dark blue hair (which turns permanently black from manga Volume 15 onward), green eyes, a distinctive mole on her left cheek, and a modified eyepatch covering her left eye. She typically wears the Nanyo high school uniform: a plaid skirt and brown blouse, but frequently dons a blue miniskirted French maid outfit for combat. Predominantly stoic, reserved, and taciturn, Ryomou exhibits a sadistic enjoyment of submission techniques, especially joint locks and throws performed with handcuffs. This demeanor stems partly from a traumatic past involving her close friends Teifu and Saji; after an incident she indirectly caused left Teifu blind and wheelchair-bound, Ryomou became more withdrawn. Her relationship with Hakufu Sonsaku later reveals a softer side, allowing her to gradually open up emotionally. The manga depicts a minor split personality linked to the dragon sealed beneath her eyepatch, causing her to alternate between shyness and psychosexual aggression. The anime portrays her as consistently unemotional, even when Saji gropes her without reaction. Her fighting style centers on professional wrestling, chi-based attacks, and precision grappling, using handcuffs as her primary weapon. Signature moves include leg-based submission holds, chi blasts, the ability to paralyze opponents by disrupting their energy flow, and the "Ryoryuu Rakan Sanjuuroku Shiki: Tenchi Hakurogeki" (Achiever of Nirvana, style 36: World's White Wolf's Impact). The dragon sealed beneath her eyepatch grants immense power. In the manga, this dragon originates from Ryuubi Gentoku, whose soul entered Ryomou's eye during a life-saving encounter three years prior; it heals her wounds and coexists harmoniously, though she seals it to avoid its influence. The anime leaves the dragon's origin unexplained but treats it as her own; it awakens when ambushed by Teni, enabling her victory despite severe injuries. When unsealed, the dragon elevates her strength to match the Three Great Rulers like Hakufu and Sousou. Before the series, Ryomou shared a close-knit friendship with Teifu and Saji. She harbors unspoken romantic feelings for Saji, which she publicly denies. Her character development shifts from arrogance to humility following her initial defeat by Hakufu, leading her to become more disciplined and protective of Nanyo. Key moments include expressing regret to Saji in a hospital scene, training under Master Chouko alongside Hakufu which builds camaraderie, undertaking a solo mission to retrieve the Dragon Jade for Hakufu's sake in *Dragon Destiny*, and participating in pivotal battles like defeating Myousai at Chibi. In spin-offs and OVAs, Ryomou appears in episodic scenarios like hot-springs episodes, where her stoicism is sometimes disrupted by comedic or fan-service interactions. Post-*Dragon Destiny*, she works with Hakufu at a cosplay café, wearing a cat-eared maid outfit and a heart-shaped eyepatch. Relationships drive her growth: loyalty to Saji motivates several arcs, her bond with Teifu reflects lingering guilt, and her evolving friendship with Hakufu transforms her from a rival to a dedicated ally. Traumas, such as Ryofu Housen's sexual assault—which forces an immodest orgasm via chi manipulation—intensify her resolve for revenge, channeled into disciplined combat. Across all media, Ryomou's journey emphasizes balancing her fierce fighter persona with underlying vulnerability, culminating in a more integrated and resilient identity.