Originally introduced as "Core People", the race of the Kais have been an important part of the Dragon Ball story for a long time, and many of them have contributed various significant elements of the Dragon Ball multiverse for millennia. From Goku's training under King Kai, to the brave sacrifice that led to the sealing away of Moro aeons before the current age, the Kais have been akin to gods long before the official introduction of the divine in Dragon Ball Super.