Keizo Amano Nathaniel Adams
Keizo Amano (known as Nathaniel Adams in US) is Keita's grandfather and one of the secondary protagonists of Yo-Kai Watch 2, as well as Yo-Kai Watch: The Movie. He is the creator of the original Yo-Kai Watch. He is a huge fan of Moximous Mask, a television superhero, and considers him his rolemodel. He is always accompanied by Hovernyan, his Yo-kai partner. Keizo appears in Worst Hero And Villain War Ever.
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