Ryu Kayō

Kaioh Ryuu has shown himself to be very strict, disciplined, and has no tolerance for failure, as shown when his students are tested so he can pass on the Kaioh name to them, believing that the next Kaioh must be strong and skilled. He initially denied Retsu Shaoron the title, but changed his mind upon Kaioh Dorian's recommendation.

During his brief fight with Yuujiro, he tells the latter that in martial arts, it is important to break objects that cannot fight back because it strengthens the fighter without hurting anyone, and shows that he is against senseless violence among people. Ryuu has also shown a strong sense of pride, using slightly sneaky underhanded tactics, such as yelling at Retsu "Don't ever insult me ​​like that again!" for trying to fight Yuujiro while the fight was still going on between Yuujiro and himself, and then throwing his bloody towel at Yuujiro to kick him in the chest, but Yuujiro only commented on what a sneaky old man he is and kicked him back. Ryuu is an elderly warrior, being 100 years old, but still retains a muscular physique. He is bald, has a white beard and eyebrows to match, and his eyes seem to be crossed or just unfocused. He wears a white sleeveless shirt, black kung fu pants with the ends rolled up, and kung fu boots.