Surely everyone has a take on dragons. Here's mine.
Dragons follow their own morality, perhaps not quite so alien as that of the creatures of the Void, but certainly not one that humans might understand. In dealing with dragons, it is perhaps best not to draw their attention. Does it especially matter to a rat whether it is in a laboratory, the hands of a sadistic torturer, or the home of a loving owner? Could it even tell? So it is, when treating with dragons. Even a dragon which appears to be helpful is likely to view you as a useful curiosity... for now.
There are four Great Dragons: the Red, Yellow, Black, and Green. None is associated with Good, or Evil, or Order, or Chaos, in a way that mortals might understand. Lesser dragons may display some combination of these characteristics, and are correspondingly weakened by the dilution of their ancestors' blood.
It is of course the Yellow Dragon that is most feared, though in truth all inspire dread. Some hold that the Black and the Red dragon are enemies, and that the Yellow and White are enemies. Others hold that there is a fifth Great Dragon, incorruptible and unchanging.
Statistics for these in your game system are left to your discretion.