Dragons are large magical beasts. In their natural forms they are huge and scaled. Some have the scales of lizards, others have the scales of fish. Beyond that, appearances vary wildly. Pretty much every artist's rendition of a dragon from every work of fiction ever written could exist. Even dragons from the same litter can be very physically different from each other, although the coloration of their scales will usually be very similar to one or both parents. All dragons can fly, regardless of the shape or existence of their wings. As a general rule, their power is only exceeded by their vanity.
All dragons are hermaphroditic in nature as a result of thousands of generations of being shapeshifters. Most have a preferred gender, which they usually choose at puberty. (Some choose earlier and about one percent never choose. Dragons can breed with any animal and often do. When a dragon does copulate with a member of another species, if it does so as the female, the offspring will be fully draconic while still resembling the father. If the dragon copulates as a male, the offspring will usually only have very limited draconic traits. (The exact mix varies depending on both partners.)
Dragons are not very religious by nature. A few of the oldest dragons claim to have met the "gods" of the Greek and Norse pantheons personally.