Anime

King Kai – Dragon Ball Z: Battle of Gods

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Information

King Kai (界王, Kaiō), or North Kai (北の界王, Kita no Kaiō; lit. “North King of World”), is the king of the North Area. He is Goku’s martial arts teacher and mentor. He later taught Krillin, Yamcha, Tien Shinhan, Piccolo, and Chiaotzu.

Source: Wikia

References