User blog comment:IamJakuhoRaikoben/Chapter 464: Natsu vs Zeref, Review./@comment-26389992-20151130163221

As pointed out by Derax in the chat: this could be Anna.. she's looks good and wifeable but place your votes on who she is:
 * Zeref and Natsu's mother
 * their sister
 * importent childhood friend
 * Zeref's side bitch after Mavis died

I'm going with sister or side bitch