Duke Devlin, known as Ryuji Otogi in the Japanese version, is a character in the video game, Yu-Gi-Oh! Dungeon Dice Monsters. He is based on Ryuji Otogi from the Yu-Gi-Oh! manga.
The very creator of this game [Dungeon Dice Monsters]. He is a tragic figure who is driven only by his desire to avenge his father's demise.