Who is the king of the Yo-kai world?

The king of the Yo-kai world is King Enma, also known as Lord Enma in some English-language localizations. He is the supreme ruler associated with the Yo-kai World.

King Enma is inspired by Enma, the judge of the dead in Japanese Buddhist tradition. Yo-kai Watch reimagines that religious and folkloric figure as a powerful monarch who oversees Yo-kai society and its relationship with humans.

The character becomes especially important in the franchise’s films and later games. In the second Yo-kai Watch film, he is portrayed as a major authority whose decisions threaten the friendship between humans and Yo-kai. Later stories explore different versions and successors connected with the Enma line.

“Grandfather” is not a title for the ruler, and Emperor Asura is a separate name rather than the standard answer to this question. The exact English title may vary by release, but King Enma is the canonical character identification.