#1: Subaru's Fire Ferret

Subaru received his fire ferret from his father. He chose the name Rengoku.

#2 Subaru's flying Bison

I don't know how fast Sky Bison grow up but Subaru's bison is pretty young. And when Appa met Aang for the first time, he was a baby bison and way bigger than Aang. After all the Bison chooses the bender.

#3: Subaru's Winged Lemur

Subaru found his Lemur when he was visiting the air temple with his mom...his Lemur was rummaging through the cabinet looking for food, mainly dumplings.

#4: Subaru's Dragon

That's the best way I can imagine what his dragon would look like. Subaru was playing in the forest one day when he found a dragon egg, the egg later on hatched and to his surprise, it was a dragon. Even though dragons live in solitude, Subaru's dragon was able to form a deep connection with him as well as all of his other animal companions.

I only thought up a name for his Fire Ferret. If you have any ideas for the names of the other three then you guys can comment them. Imma work on Mei Befong's bio before I start the first chapter also, so be on the look out for that.