Mikiharu Kawaguchi, also known by the nickname Mick, is a Japanese boy who participates in the Bakegyamon game as one of the main players in both the manga and anime. He has short blonde hair and gray eyes. His most distinctive trait is his manner of speech: he uses American slang, which sets him apart from the other Japanese contestants. His primary motivation for entering the game is a desire to become popular with young girls, reflecting a superficial but earnest wish. In the story, he serves as a fellow competitor alongside the protagonist Sanshiro Tamon, interacting with him and other players as they battle using monsters in the backwards universe. His personality is shaped by his attempts to appear cool and confident, though the slang reveals a deliberate effort to adopt an outsider persona. No detailed background from before the game is provided, and his development over the course of the series is not extensively documented. Like all participants, he commands monster partners in battle, but his specific abilities or signature monsters are not highlighted. His notable ability remains his unique vernacular, which he uses to navigate social interactions within the competition.