Jo Kaiō is a fictional martial artist of Chinese origin bearing the title of Kaiou, signifying his mastery. He possesses significant height and an imposing physical build, enhancing his formidable strength. Entering the Raitai Tournament, he operates under the authority of Kaiou Kaku, grandmaster of the Sea Emperor system. His combat revolves around Chinese Kenpo, focusing on powerful striking techniques. Jo Kaiō exhibits an extraordinary tolerance for pain, demonstrated when he endured a direct strike to the crotch from Mohammad Alai Jr. and continued fighting. However, this confrontation also exposed a limitation: despite his efforts, he failed to land a single strike against Alai Jr.