Fang

History
Fang was Avatar Roku's friendly dragon and loyal steed. He was His companion, much like Appa and Aang. Roku found Fang when he was just a baby, not yet hatched from his egg. Fang's parents were gone, so Roku raised the young dragon as his own and they've been inseparable ever since.

When Roku's Island had a massive erruption, Fang tried to help his master. Even though Roku insited that he leave, Fang stayed with him the whole time. Fire Lord Sozin betrayed Roku and let him die from all the poisonous gases. Fang then curls up around Roku as if to protect him and the two die together. Fang then enters the Spirit Wolrd with Avatar Roku.

Fang first appears to Aang in the episode "The Spirit World (Winter Solstice, Part 1)." After Aang discovers he is in his spirit form for the very first time, he is comfrinted by Fang. Fang takes Aang to the Fire Temple on Crescent Island to see Avatar Roku's statue. Aang finds out that Avatar Roku wants to speak to him about Sozin's Comet, and the only time they can talk is during the Winter Solstice. The dragon then takes Aang back to his body.