User blog comment:CNBA3/My Big Three Theories!/@comment-169.233.28.154-20150217210301

You beat me to it. I wanted to start a blog that I thought Zeref and Zeira were the parents of Natsu, but I couldn't figure out how to do it. Since Natsu is END, and also (probably) human, the only way Zeref could create a human would be the natural way. Zeira is the only one who could be Natsu's mother that we've met so far, but Natsu's mother could still be someone we haven't met...