Asha is a companion
Companions have been known throughout history as many different things; spirit animals, guardian angels, ...patronus
These are all companions. Companions are little creatures which represent your very being. Your soul.
They can be very large or very small, depending on your personality.
They can be any species, although humans are so complex they tend to be a mixture of at least 2. But it's different for everyone
They are basically beings that follow you around, they are your companion.
They reveal themselves to their owners, or "masters," when the master needs a companion the most, be it when they're overwhelmed, depressed or simply lonely. With a companion, you're never alone.
Once someone is able to see their own companion, they can see other's ones as well!

Companions are a totally open species. Have fun with them! And please, if you discover your own companion, show me! I love to see new companions!!!

Companion maker guide: http://www.furaffinity.net/journal/7871034/