Ryūō(リュウオウ) is a son of the Hokuto Sōke clan who lived in the Land of Asura sometime around the 2nd or 3rd century. Born to a woman named Ōka on the same day as Shuken (the son of Shume, Oka's sister), high priests forbade the existence of two male heirs to the clan, so they left Ryuo and Shuken exposed to a pack of starving wolves so that the surviving child In the anime series, it is established that Ryuo left the clan after growing up and became the founder of Hokuto Ryū Ken.