Mitsuo  

Pierre the Gambler, ミツオ

Pierre the Gambler, also known as Mitsuo with the nickname Boy, was an acquaintance of Asuka from childhood who later became a renowned gambler skilled in various games such as blackjack and poker. He stole Asukas red handkerchief during their duel monsters game, but lost to her. It was later revealed that he had feelings for Asuka and returned the stolen item to her.