Shimei Ryomou is a third-year student at Nanyo Academy and one of the institution's elite Big Four fighters, counted among its most formidable combatants. She possesses short dark blue hair, green eyes, and a distinctive mole on her left cheek, typically wearing a modified eyepatch over her left eye. Her standard attire is a plaid skirt and brown blouse school uniform, though she frequently dons a blue French maid outfit for combat. Standing 160 cm (5'2") with measurements of 85-58-86, Ryomou presents a reserved and stoic demeanor, often displaying a sadistic enjoyment in battle, particularly through submission techniques involving joint locks, throws, and handcuffs. This hardened exterior stems partly from trauma after her friend Tokubou Teifu was left blind and wheelchair-bound. Despite this, she demonstrates fierce loyalty and protectiveness toward close companions like Teifu and Genpou Saji, with whom she shares a long friendship. She harbors unexpressed romantic feelings for Saji. Specializing in grappling techniques and chi-based attacks, Ryomou utilizes leg-based submission holds. Her signature techniques include the "full moon choke hold" and "Ryoryuu Rakan Sanjuuroku Shiki: Tenchi Hakurogeki" (Achiever of Nirvana, style 36: World's White Wolf's Impact). Handcuffs serve as her primary weapon for restraining opponents. Classified as a B-rank fighter, she has defeated high-level adversaries like Kouha Kannei and Genjou Kakouton, though she has faced defeats against fighters such as Unchou Kan-u and Houkou Kakuka. Her mysterious left eyepatch seals a dragon spirit. In the manga continuity, this dragon originated from Gentoku Ryuubi, transferring to Ryomou during a near-fatal incident three years prior; it now coexists harmoniously within her, granting regenerative abilities and augmented power when released. The anime adaptation presents the dragon as inherently her own, acquired through unspecified means. In both continuities, the eyepatch suppresses the dragon's influence, with activation risking a more aggressive, berserk state. When fully unleashed, her power rivals the series' primary rulers. Her story begins enforcing orders for Nanyo's student council, battling Gakushuu and Hakufu Sonsaku. During her initial fight with Hakufu, she sustains severe injuries but is saved by Saji's intervention, costing him an arm. This event softens her rigid exterior, fostering a reluctant alliance with Hakufu. She later participates in school tournaments, losing to Seito's Unchou Kan-u after breaking Kan-u's arm. She collaborates with Hakufu in training under Master Chouko, developing cooperative combat techniques. A personal vendetta against Ryofu Housen emerges after Ryofu humiliates and paralyzes her during an encounter at Rakuyo High School. This fuels Ryomou's determination for revenge, driving her to dominate opponents in the Great Fighters Tournament while fixated on confronting Ryofu. In later storylines, she retrieves a dragon orb in China to aid Hakufu, awakening her own dragon during an ambush by Teni. Though injured, her dragon-enhanced state overwhelms Teni before Chou-un intervenes. She recovers to participate in pivotal battles like the Battle of Chibi, where she defeats Myousai. Differences exist between her manga and anime portrayals. The manga depicts a more complex personality, including moments of shyness and a psychosexual alternate state linked to her dragon, plus a narrative connection to Seito Academy and Ryuubi. The anime streamlines her into a consistently stoic figure, removes the Seito backstory, and emphasizes her protective role toward Hakufu. Post-Dragon Destiny seasons show her working alongside Hakufu in a cosplay café, adopting a cat-themed maid outfit with a heart-shaped eyepatch. Ryomou evolves from an isolated, combat-driven fighter to one who values camaraderie, particularly with Hakufu and Saji. She maintains a steadfast commitment to Nanyo's safety, often positioning herself as Hakufu's primary defender against threats like Ryofu and external school aggressors, solidifying her role as a dedicated guardian within Nanyo's hierarchy.