Ryuujin, Shougo

竜神翔悟

Shougo Ryuujin is the son of Kengo Ryuujin and Chie Ryuujin, the younger brother of Tomoko Ryuujin, and the childhood friend of Saho Shimatani.
He was an ordinary high school student until he encountered the Dragon bone card, which then made him its adept and Earth's keystone. Additionally, he holds a black belt in karate.