The Descendant of Oni and Dragon

A Teen named Curtis N. Ryker lives in the crossroads ever since the merge made his parents disappear, Curtis has been living with Alfonzo Frohicky before he then moves in with Fedulian in his shop. What happens when one night he meets both Arin and Sora along with a teenage mountain dragon named Riyu? What if they were trained by the legendary ninja? What if he joins the ninja to help stop Lord Ras from releasing the Forbidden Five? What if he suddenly gains elemental powers? And who's his father?