User blog comment:Ari@n/yukino's sister/@comment-3970561-20121012155240

well I read what you all said and after I gave it a lot of thought I changed my mind! it's more likely Angel!

Sora(no) means "sky" in Japanese--> Angel wanted to go to the sky, the ribbon that Sorano wears in the flashback is like Angels, Yukino and Angel are both Celestial magicians and look alike etc=> guys/girls you are right, she is Angel after all!