A minor duelist, Ghost Kotsuzuka appears in both Duelist Kingdom and Battle City. In Duelist Kingdom, he is Bandit Keith's flunky and duels against Jounouchi in the grave yard arena. After loosing, Keith beats up Ghost and his two other flunkies, taking their star chips so that he can enter the castle.
Ghost fairs even worse in Battle City. Still part of Keith's gang, even with Keith's disappearance, he and his friends scare duelists into dropping their Duel Disk (and thus puzzle cards). Dark Bakura finds him and is not scared or impressed by the trick and challenges him to a duel and Game of Darkness. Ghost fairs miserably, and gets dragged into hell as penalty for loosing. In the manga, the penalty is instant death.