Ouryuu belongs to the Tayutai, a supernatural race sealed in a relic for five centuries until accidentally freed. He ranks among the "Three Mightiest" alongside Houou and Nue, all united in their contempt for humanity. His human guise presents a handsome, pale-skinned man with white hair, spiky bangs, and pointed ears, typically clad in refined suits, shirts, and neckties—a charming veneer masking his malice.

His true identity manifests as a mighty dragon, reflecting his Tayutai stature. Ouryuu despises humans, rejecting coexistence as unattainable and opposing figures like Mashiro. He drains human spiritual energy to amplify his power and pursues vengeance against Kikuramikami no Hime, the goddess incarnated as Mashiro.

Ouryuu’s schemes ignite conflict as the Three Mightiest thwart harmony between humans and Tayutai. Motivated by ancient grudges and a drive for Tayutai supremacy, he clashes directly with protagonists. His character lacks significant development or redemption arcs.