I searched for “Dragon God” on Google, and the second result was for the Wikipedia entry on Ryujin, which literally means “dragon god.” He’s an ocean deity who lives in a coral palace at the bottom of the sea. I suppose that fits in with the East Asian conception of dragons, where they tend to be heavenly beings rather than disturbing monsters (although it’s certainly possible to be both). I can think of a few different video games with dragon gods, or at least dragons with celestial powers.