Rouki is a recurring antagonist in Hyakijuu Sentai Gaoranger.
History[]
Very little is known about Rouki's past, the only thing that is known about him is that Rouki is a by-product of an evil energy from an Org that was inside a cursed wolf mask. And in a millennium ago, after the defeat of Gao God at the hands of Hakkimaru, Shirogane uses the powers of the wolf mask. And in a millennium ago, after the defeat of Gao God at the hands of Hakkimaru, Shirogane uses the powers of the wolf mask to destroy the Org. Although he achieved the mask it dominates his conscience, transforming him into Rouki. And with humanity as he was left, Shirogane still begged his allies to seal in a stone coffin where he remained. However, after a long time in prison Rouki loses his memory of Shirogane and goes on revenge against the Gaorangers. He gave the Gaorangers a lot of trouble and picked up GaoElephant, GaoGiraffe, GaoBear and GaoPolar. However, Rouki's past nature proved honorable and helped GaoWhite with his injuries and also cared for a puppy.
However, Ura manipulated him using brainwashing, but even in a difficult fight. They manage to defeat him by overcoming the curse, however the mask would come to life and Rouki would have unfinished business with Shirogane. With that, Rouki fights against Shirogane and almost kills him; but ended up being destroyed and purified by GaoHunter.