Kaioh

Kaioh (カイオウ) is Raoh, Toki, and Sayaka's eldest biological brother. He bares an uncanny resemblance to Raoh, even causing Kenshiro to mistake him as such when unmasked. After Raoh's death, Kaioh sought to continue his younger brother's legacy in Shura. Like Raoh, he wears intimidating armor, rides a giant red horse, and leads his own army.

Kaioh and his family line come from the protective branch of the Hokuto ancestry line, essentially being their guards when and if danger arises. When Kaioh's mother loses her life to protect the Hokuto ancestors, Kaioh bears a seething hatred for their descendants. Unable to overcome his grief for his mother's death, he swears to cause Hyo and Kenshiro unimaginable suffering. He secretly kept the seal over Hyo's memories and manipulated the brothers to be enemies.

When he learns that Rin is a descendant of the Holy Emperor's bloodline, he has her abducted to bear his children. He thinks that the divine ancestry can cleanse the curse on his family line. Throughout the story, he immobilizes and tortures those close to Kenshiro. Yet even with all of his schemes, he is infuriated to learn he is ultimately trumped by the power of love shared between them. In a race to obtain the secrets of the Hokuto ancestors, he challenges Kenshiro to a duel at the Hokuto holy land. His cruelty loses favor with the spirit of the Hokuto ancestors and Kenshiro inherits the style's secret technique. At the end of their fight, Hyo tackles him into a pool of magma. Both of their corpses fossilize as stone statues.

Fighting Style
Hokuto Ryuseiken is a centuries old assassination technique that was devised during the Three Kingdoms era. It was originally made to protect Liu Bei, whereas the Hokuto Shinken once protected Cao Cao. Throughout the centuries, the martial art was led astray into the arts of darkness. The users of the art can distort their fighting aura to oppress their competition, even capable of manipulating their opponent's movements. Non-fighters feel helpless against it, unable to move or even breathe against it. If needed the aura can be projected to form a nigh impenetrable barrier around the fighter to defy his opponent's attacks.

In the game, Kaioh is essentially an expy of Raoh in both fighting style and appearance like the original comic. Hisashi Koinuma remarked that it was troubling to devise attacks to differentiate them.