Kaioh is characterized as the strongest warrior of the Asura and he proclaims himself to be the Creator of the New Century. He wears a specially constructed armor which allows him to control his evil aura. He hates the main Hokuto bloodline, from which Ken and Hyoh are descended, due to the fact that he was forced to play a subordinate role to Hyoh by Jukei, despite possessing superior skills. Kaioh is the last major villain in the Hokuto no Ken manga and anime.

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Kaioh is the elder blood brother of Raoh and Toki, who remained in Asura after his brothers left the country when they were children. He bears a strong resemblance to Raoh, only with an x-shaped scar on his face.