User blog comment:JohnnyN64/END/Natsu theories don't add up/@comment-5303512-20150217033421

Dudes, Very Important Theory Regarding the Natsu and E.N.D. Topic!!!!!!!!

I think that Natsu is just the Physical Form of E.N.D and we all know that the Book of E.N.D is E.N.D's soul. So maybe 400 years ago, E.N.D's body was destroyed and his soul was sealed back into book form. So now that Natsu is E.N.D's body with his own personality, if he opened the book his soul will return to Natsu. (Just like in Heroes where Matt Parkmen sealed Sylar's consciousness inside him while Sylar's body took the personality of Nathen Patrelli)