He was also captain of the Chinese Team representing China in the Raitai Tournament. Kaku Kaioh is a father of Shunsei Kaku.
Kaku Kaioh has shown to have both sociopathic ruthlessness and pride in Chinese Martial Arts and its culture going as far as stabbing three Chinese Martial Arts Assossciation elders in the hand with a needle and then slicing off their limbs with a simple hand chop and dismissing two current Kaiohs due to "emergency" to replace them for his son and best friend in the name of China and its martial arts to win the Raitai tournament and not lose to foreigners going as far to even kill the other team so that a Chinese fighter would win the tournament.
He has also displayed very little emotion and has abandoned all joys of life in the pursuit of strength and being the strongest martial artist in the world.
While old age has made him look down on the younger fighters he has shown to only respect Yujiro Hanma due to the fact that Yujiro was able to beat and almost kill the old man by giving him an enjoyable match and honorable "death." Kaku Kaioh respected Yujiro's strength and fighting abilities so much he granted him the title of Hanma Kaioh and doesn't deny the fact that Yujiro earned it and blesses the King by wishing they see eachother next time in a hundred years for the next Great Chinese Tournament.
Kaku Kaioh, due to his more than a century-long years of experience and learning, as well as perfecting the weaknesses of his abilities, has a vast variety of knowledge, especially over martial arts. He is a perceptive character who can very easily see through the mentality of another person, how they prefer to fight, their level of power, etc. He's very clever, as he escaped a certain death by the hands of Yujiro Hanma through very deceptive tactics. He draws his inspiration from his own past misguidance, as well as life all around him.
In the Baki: Son of Ogre series Kaku is shown to make an appearance at the request of Kaioh Retsu to help train and aide Katsumi Orochi in the fusion of Chinese Kung Fu's 4,000 years with Karate's 500 year history. In this series Kaku is shown in a more nice and friendly personality with a bit of comedic sense.
He is a shrunken, almost skeleton framed elderly man being 146 years old being shorter than Baki with long white hair, a largely and distinguished amount of wrinkles throughout his entire body and face and has very long finger nails. Attire wise he wears a Chinese cap and round glasses on his head. A light colored knee length tangzhuang jacket and matching pants with kung fu shoes. When not fighting he is seen sitting in his wheelchair.
In his youth he is seen being very large and muscular being almost the same size as Biscuit Oliva. His long black hair being tied in a traditional topknot and wrapped in a cloth with a robe wrapped and tied around his waist. But due to his first loss at the hands of an elderly Kung Fu master Kaku abandoned all weight training equipment and began his Kung Fu training only to notice his once large muscles began to shrink and wither away to his current body.
Kaku Kaioh was once a young, arrogant strong man who considered himself to be the strongest man in the whole Asia. He thought the strong will always overcome the weak, laughing at the logic of a chinese martial arts. He thought that the weak one can't beat the strong one. In these times, he took part in a lot of fights with wild animals and fighters. But one day, Kaku fought an elderly chinese martial arts master and he was easily defeated by him. After that he decided to give up with a body training and started to taking seriously the philosophy of the Chinese Kenpo. After extremely long time, he finally obtained the true power of the chinese martial arts. Despite of being a shrunken fighter, he became the supreme grandmaster of this fighting style.
Kaku Kaioh is a powerful grandmaster of Chinese martial arts and the strongest of all Kaioh, except Yujiro. He has a wide knowledge of everything. His skills, the result of over a century of training in Chinese martial arts, allow him to easily defeat a Muay Thai-using Kaioh Samwan, who is a fifth his age, in less than ten seconds without sustaining injury. He can slice several human limbs off with a simple chop of his hand, and even injure and send flying Yujiro himself, making him a few people beside Orochi and Baki to be able to fight toe-to-toe with Yujiro. Kaku can also perform attacks with supersonic speed, that can easily cut an egg like a sword.
Kaku can also use dirty tactics: in the battle with Yujiro Hanma, Kaku faked his death to avoid being killed by his opponent. It can be consider as a coward tactic, but for Kaku, it was just a cunning and great plan to survive.
The full extent of his power at this time, however, was never stated. His primary technique is called Shaori that produces hyposthenia, which allows Kaku Kaioh to absorb the whole body weight of his attacker. The ultimate hypostenia can absorb, contain and release 'the ultimate punch'. Using this technique to perfection, Kaku Kaioh, even though physically far weaker, was able to go toe-to-toe with Yujiro Hanma and even backed him into a corner for one moment.