|Japanese name:||如月 竜司|
Ryuji has a vague memory of when he was younger and saw Rose hatch from her egg in front of his eyes. Ryūji is a level 10 breaker, said to be the highest level of breakers who go to find/use lost precious. Besides Ryūji, there are seven other level 10 breakers in the world, all older than he is. Later, he is recognized by some of the other dragons as Rose's fiancée, but this is due to a misunderstanding.
He truly has feelings for Rose and does care about her, but has yet to be confirmed. This is evident when he first "Engaged" with Rose, which allows him to borrow Rose's power and achieve unbelievable power. He desperately hates frogs to be scared at them from the mere sight of one (episode 8 near the end). He also begins to feel embarrassed around Rose once he performed the dragon's coming of age ceremony with Rose (which was simply kissing the dragon scale birthmark on her hand).
Spoiler anout Dragon crisis According to Onyx, Ryūji is not human but the corporeal form of a Lost Precious called "Dragon Crisis" that can exert a great influence over dragons, thus he is able to wield the Lost Precious "Slash Breath" - a powerful weapon feared even by them, and the reason why having performed the coming of age ceremony with Rose weakened her body, forcing him to hand Rose over to Onyx and Kai in hopes of saving her life.