A character from the Yu-Gi-Oh! series.
The creator of the hit board game Dungeon Dice Monsters that's popular in school and the owner of the game shop 'Black Clown' that rivals the Kame Game Shop.
In the manga Ryuji has his mind set on one thing; revenge on Yugi Mutou. Ryuji's father, Mr. Crown, one day was dueling Yugi's grandfather, Sugoroku Mutou, and was cursed by an ancient 'Reaching The Goal' dice that aged him by fifty years in one day.
After defeat from Yugi, Ryuji becomes an important secondary character to the series who saves Shizuka Jonouchi and Hiroto Honda from Rare Hunters in Seto Kaiba's Battle City.
Ryuji is portrayed as the flirtatious womanizer with a sense of humor. Towards the end of the series he slips his phone number to Shizuka whom Hiroto also has a crush on.