rautamiekka 
I give up.
Judging by MyLittleWiki, that CM belongs to 'G3.5' Sweetie Belle, who happens to be the only unicorn in 'G3.5', but her hair color and eye color are wrong.
Hair colors and eye color matches 'G3.5' Toola-Roola, who's an Earth.
Judging by MyLittleWiki, that CM belongs to 'G3.5' Sweetie Belle, who happens to be the only unicorn in 'G3.5', but her hair color and eye color are wrong.
Hair color