A young boy with long blue hair.   He is a genius in using gekifu and teaches Sanshiro in the way to win Bakegyamon.  

Sanshiro's chances of having an adventure are slim to none in his tiny island hometown, until the day a mysterious stranger invites him to play a game... Without warning, Sanshiro is taken to a backwards universe to play BakéGyamon--a game pitting monsters against monsters. Along the way he meets other players who have a particular reason for being there--to obtain the wish that is granted to the winner. 
(Source: VIZ media)

__Alma Mater:__ Tokyo International University

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Sanshiro's chances of having an adventure are slim to none in his tiny island hometown, until the day a mysterious stranger invites him to play a game... Without warning, Sanshiro is taken to a backwards universe to play BakéGyamon--a game pitting monsters against monsters. Along the way he meets other players who have a particular reason for being there--to obtain the wish that is granted to the winner. But how far can Sanshiro get when the monsters he's been paired with are a bunch of little mud balls?!
 
(Source: Viz Media)

Masato Sugai