Easy. My absolute dream pet is featured in my avatar.
Isn't she perfection? ♥
Sleipnirs usually look fierce and strong (and I like them for that), but I
love how sweet this little one is, so fragile-looking in her sleep... Her colors are great too, I totally dig the "pure white and pale rainbow" look.
I don't know exactly what the matter is with me, I think I just never got over the Care Bears: Anything cloudy/rainbowy/dreamy/softy is still overly attractive to me.
And, of course, having my own horse used to be my dream when I was a teenager so... this pretty little lady is like a mix of all of my younger self's dreams.
There is only one other pet that I adore as much as the rainbow alicorn: Dolos (and I am lucky enough to have him ♥).