Sozin's dragon

Sozin's dragon is a blue dragon that Fire Lord Sozin used as a mount. As vicious as his master, Sozin's dragon was able to fly over great distances at very fast speeds. Sozin is the only Fire Lord known to have a dragon.

Not much is known about the dragon's history or when Sozin got it, though it may have been between the 25 years Sozin and Roku did not see each other. It is possible that this dragon was killed when Sozin started the tradition of hunting dragons for glory or that it died with its master.

Trivia

 * Sozin's Dragon represents the comparison of red and blue dragons, as Fang is red and represents good, as Sozin's Dragon is blue and represents evil.