User blog comment:IamJakuhoRaikoben/Chapter 366: 1000 Souls, Review./@comment-4449950-20140111003333/@comment-7418318-20140111101101

But Flare might actually be an option.

Both she and Natsu were orphans taken in by foster parents. One has pink and the other red hair. Both have an affinity to fire.

I could see that actually happening.

It would even explain why Atlas would get the idea of blessing her with the gift of fire in the first place, if she reminded him (whether consciously or subconsciously) of Natsu.