Mr. Otogi

Mr. Otogi is the main antagonist of The Dungeon Dice Monsters arc of Kazuki Takahashi's manga series Yu-Gi-Oh!. He is the father of Ryuji Otogi who held a severe grudge against Yugi and his Grandfather Sugoroku for making him age rapidly when he lost the devils board game to determine who will keep the millennium puzzle so he made Ryuji challenge Yugi to a game of Dungeon Dice Monsters in order to "avenge"/succeed him threatening to kill his own son should he fail and threatening to keep the millennium puzzle for himself should Yugi fail.