User blog comment:FairyRaven/Fairy Tail Chapter 435 & 436: The Cry of Victory & Memoirs, Review and Commentary/@comment-26266140-20150518182053/@comment-5303512-20150520003634

I thought it was already confirmed that E.N.D. was evil since Atlas Flame said that he is the most vile demon of Zeref's Books. Even Zeref and Igneel mentioned that Natsu can face him. And from what we saw from all the Demons of Zeref so far, None of them have been kind, so there can be no chance that E.N.D. will be different.