User blog comment:IamJakuhoRaikoben/Chapter 443: And Then, The Land Was No More, Review./@comment-24546844-20150706154952/@comment-24546844-20150706160313

Draonification is less likelly but demonification is a possibility.

I wonder if E.N.D. is actually evil. I mean, yeah, he's powerfull, but I don't remember somewhere stating that he is made of evil like the other demons. He was a human after all, so I get the feeling that it won't go around taking over Natsu's body and losing control. I guess whne it happens he'll just regain his memories and be confused but not evil.