Tumblr source
 
Spindle: Hello there!
 
Parcly Taxel: This is the first vector of my windigo companion and assistant. Spindle is properly genderless, but was once a mare, so I call it a she.
 
Spindle: I was first drawn to Parcly by the hatred she had for her parents. I wanted to turn her into a windigo like myself - and would have if not for the chemotherapeutic agent she’s named for. Since then I have provided to her emotional advice and the temperature magic characteristic of my species, the latter of which helps in cryogenic experiments. The full story can be found here.
 
Parcly: Unlike Spike, Spindle is ethereal and can enter my body whenever she needs to rest. There’s a patch of ice on my heart where she resides, left over from her conversion attempt.
 
Spindle: To most ponies my coat is as cold as the lunar surface, but it doesn’t have to be this way. Send me your questions so that my hollow interior may be warmed by the fire of friendship.
 
(SVG here)