Next is a question on how Toriyama came up with the structure of the DB cosmos. He said it was so that it would be easy for both him and the readers to understand. As he explains, it’s this big ball, divided up into the living world and afterlife, and outside that ball are the Kaioshin.
But, Toriyama adds, at the bottom of that big ball, like an antipode, is the Demon Realm (Makai), where there are the Makaioshin (“Gods of the Kings of the Demon Realm; an obvious counterpart to the Kaioshin), who rule over evil. Toriyama says that it seems at the moment, the Kaioshin’s power is greater than the Makaioshin (Japanese not really having a plural form, it’s unclear from all this whether there is only one Makaioshin or more).
Where Kaio come from
Toriyama is next asked what the Kaio’s heredity system is like. Toriyama explains that inside the giant ball that is the DB cosmos is a world called Planet Kaishin (World-Core), which is where the Kaio are all born and raised. This planet is like a giant version of the Kaio Planets that North Kaio and the others live on. On it is a gigantic tree (or trees; the lack of Japanese plural clouds up things again), the Kaiju (World-Tree), and the Kaio are all born from the fruit of this tree, as Shin-jin (Core-People). The population of this planet is about 80. The Shin-jin are genderless, and their average life expectancy is said to be 75,000 years. They live leisurely lives, studying various things at a school-like castle. But whenever one of the Kaio on the Kaio Planets passes away, they draw lots among themselves to choose who will take that Kaio’s place and become the new Kaio. The Kaioshin, however, are chosen only from among Shin-jin born from a special golden fruit that is particularly rare. Occasionally there are delinquent Shin-jin with evil hearts, and they go to be with the Makaio (“Demon Realm Kings”; apparently the Demon Realm answer to the Kaio, like the Makaioshin are to the Kaioshin, though Toriyama doesn’t explain the term).