Kai is a fairly smart guy, he is 33 years old, but despite his great age, his height is only 160 cm, which makes him seem like a teenager... Kai has white hair, brown eyes, a long white sleeveless jacket, beige pants , there is an iron collar around his neck, and he wears a red cloth. Kai also has a brother, Beru, who is a little younger than him, but much taller. they live together, and Beru like to play the piano for brother