I had a bit of inspiration, perhaps i could give a bit of meso-American spin on the whole naga aspect, and having his clan be descendants or off shoots of quetzacoatl, giving his tail a feathered look and having a mixture of wind and light magic, and the relation to a Diety giving him a weakness to dark magic. I'm open to ideas though, this is just kind of a prototype idea. The fact that they come from a being that used to be worshipped would also explain their willingness to interact with humans.