[@ERode] What do you mean? 
There are lots of Dragons, and Dragon kin. When you hear Dragons, what people will immediately imagine are the coloured, typical ones. 

My monsters and fauna of the world are basically the D&D one, so dragons come mainly in two types; Chromatic and Metallic. 

Chromatic dragons are Evil; Red, Green, Blue, White, Black. 
Metallic dragons are usually either Good or Neutral; Gold, Silver, Brass, Bronze. 

Apart from this, you have a certain number of creatures of dragonkin from Kobolds to Demi-Dragons and Dragonborn. So that question covers a lot of ground.