Ryūra

was a fierce warrior and the leader of the demon band known as the Four War Gods (Shitōshin). Many years ago, Ryūra and his comrades invaded the legendary island Hōraijima and caused much distruction. In desperation, the island's priestess, Lady Kanade, sealed the Four War Gods' spheres of power inside a jeweled comb box and hid it inside the Cauldron of Resonance. Without their powers, the Four War Gods were forced to remain on the island until they could retrieve the comb box.

Eventually, the Four War Gods initiated a plan that would allow them to regain their original power by using a cloned priestess. During the course of executing this plan, however, the Four War Gods were opposed by many opponents, among them the half-demon Inuyasha.

Trivia

 * Ryūra is one of the four antagonists created for InuYasha the Movie: Fire on the Mystic Island. Each of the Four War Gods is based on one of the Four Sacred Animals of Chinese mythology and astronomy. Of the four animals/constellations that make up the group, Ryūra represents the Azure Dragon of the East known in Japanese as Seiryū. Coincidentally, Seiryū is one of the demon ninjas under Hoshiyomi. Each of these four ninjas have, like the Four War Gods, an affiliation with one of the Four Sacred Animals. Seiryū has many reptilian features and mannerisms which signify his affiliation with the Azure Dragon, besides his name. However, he appears to be more snake or lizard-like, and has no obvious connections with a dragon, unlike Ryūra.
 * The kanji which make up Ryūra's name (龍羅) are read in the on'yomi style, a Japanese reading of kanji based on the original Chinese pronunciation. This reflects the Chinese origins of the Hōrai Island myth, known in China as Mount Penglai.
 * The suffix -ra is common in each of the Four War Gods' names. It can be read as "mist", which ties in with the mist that shrouds Hōraijima, as a result of the time barrier.