What are the other Animal Guides? When Aang was in the Spirit World during the Winter Solstice he refereed to Roku's Dragon as Roku's Animal Guide like how Appa is to him.

I am wondering what are the Animal Guides for the other Avatars? do each Elemental Tribe have a single animal (ie. Air Avatars have Sky Bisons, Fire Avatars have Dragons) do does each Avatar have their own one regardless of elemental origin?
It's impossible to say whether the other avatars had Animal Guides. The only ones we see are Korra's, Aang's, and Roku's. Kyoshi, Kuruk, Yangchen, and Wan were never seen with one. Of those, Wan was the only one we really got a lot of backstory for and he was never seen with an animal guide, though it seemed Ravaa may have been the equivalent for him.

While the earth kingdom avatars are never seen with an animal, if the other three avatar animal guides we've seen are indicative of their respective elements' animal guides then it would be:


Dragons for Fire Avatars
Air Bison for Air Avatars
Polar Bear Dogs for Water Avatars.


There isn't much information that I could find on this subject, so this is the best answer I was able to come up with