User blog comment:Sargenttacos115/Natsu and Gajeel age Theory/@comment-76.169.61.239-20140806234440/@comment-71.238.169.137-20140818040048

I doubt Natsu is one of Zeref's demons, however it would make some sense. For example: I don't know if it was actually said, but I'm pretty sure it was said that only one of Zeref's demons could kill another one of his demons, so that would explain how Natsu beat Lullaby (With help to damage it) and Deloria. An interesting theory, especially if combined with the theory that E.N.D. is Natsu, or maybe a parallel/paradox Natsu. E could mean something, mixed with N.D. (Natsu Dragneel!). But I digress.