This character is based off a real person of the same name, who worked as an ambassador for the Bottleman franchise and also voiced this character himself.

The anime centers around a boy named Kouta Kouga (Kouga Kouta in Japanese name order, an apparent wordplay on Coca-Cola). Kouta strives to be the world's best Bottle King at the Bottle Battles in the virtual Drink World. He comes across his Bottleman partner Colamaru and then wages battles with various rivals.
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(Source: Anime News Network)

Dew Yamamoto