Shimei Ryomou is a young woman with striking short blue hair, emerald-green eyes, and a subtle beauty mark accenting her left cheek. Her left eye remains concealed beneath an eyepatch, hinting at hidden depths to her past. She pairs a tailored blue French maid outfit—complete with a miniskirt—with utilitarian fingerless gloves and sturdy combat boots, blending elegance with practicality. Standing 160 cm tall, her 85-58-86 cm proportions underscore a lithe yet athletic build.

As a third-year Nanyo Academy student, she ranks among the elite B-class fighters and stands as a key member of the renowned "Big Four." Specializing in submission wrestling, she dominates opponents through precise throws and joint locks, augmented by mastery of chi-based techniques that expand her combat versatility.

A dragon resides within her sealed left eye, awakened during a pivotal clash with Ryuubi Gentoku. This symbiotic force grants extraordinary power but exacts a toll, its presence slowly eroding her vitality.

Her dynamic relationships shape her journey: a bond with Genpou Saji intertwines mutual respect with unspoken romantic tension, while her rivalry with Ryofu Hosen sharpens her competitive edge. These connections, paired with her enigmatic aura and combat prowess, cement her as a layered figure within her world.