Here's my dragon fursona and OC named Flux. He doesn't really have any back story or since he's just a furry version of me, but the OC version does have one. It just varies from story to story but there are a few traits that are commonly displayed by the OC version.

-Flux is a Moon/Lunar dragon that gets his powers from the moon.
-Flux's element changes from Holy to Dark based the cycle of moon and has a Neutral element during day time.
-He's shorter than the average dragon.
-Flux is usually portayed as a pacifist and a down to earth dragon that does not display aggresive dragon behavior. He treats kobolds with respect.
-Flux has 1 kobold that serves under him named is Zapps which like the OC version of Flux, has a back story that varies from story to story.