Kaioh Yoh, also romanized as Kaiou You, hails from China and bears the prestigious title of Kaiou, symbolizing his martial arts mastery. Trained rigorously under Grandmaster Kaiou Kaku, he specializes in Chinese Kenpo and endured grueling Kongoken conditioning to forge a "diamond body" capable of withstanding strikes from wooden swords, chains, heavy trucks, and cannonballs. His legendary resilience was demonstrated when he remained conscious beneath a typhoon’s raging waterfall. At the Raitai Tournament, his ruthless arrogance emerged as he exploited opponents’ vulnerabilities without hesitation, such as mercilessly attacking Kaiou Dorian despite the latter’s mental disability. Overconfident in his indestructible physique, he often invited free strikes—a tactic exploited by Biscuit Oliva, who countered with slow, crushing force to his spine, revealing a critical weakness. Official media confines his narrative to the Raitai Tournament, with no expanded background or additional arcs. His techniques include a devastating axe kick deployed against Dorian, and his combat style emphasizes unyielding endurance. Details such as his age, personal history, or interactions beyond the depicted events remain unspecified.