User blog comment:FairyRaven/Fairy Tail Chapter 301: The Dragon King, Review and Commentary/@comment-3970561-20120928192704/@comment-3970561-20120928194617

I was between the possibilities that Natsu is Zeref's son or Acnologia's descentant... now that I saw the picture of the last as human he reminded me of Natsu in Edolas (Great Demon-Lord Dragneel)... but still it's just a theory!