|Please note that "Kai" redirects here. If you are looking for the article on the series, then you should head to Dragon Ball Kai.|
The Shinling who become Kaiō are born from the "ordinary fruit" (ふっぅの果, futsū no ka) of the World Tree on the planet Kaishin. Occasionally, there are delinquent Shinling born with evil hearts, and they would become the Makaiō.
They are genderless and have extraordinarily long lifespans. Those born of an ordinary fruit can live upwards of 75,000 years. In their homeworld, they live leisurely lifes, studying various things at a school-like castle. When a Kaiō passes away, they choose among them by lottery who will take over that Kaiō's place and become the new Kaiō.
Unlike the Kaiōshin, the Kaiō appear to be personally involved in their quadrant of the universe, as Kaiō of the North] of the Seventh Universe was extremely active during the events on Earth and Namek.