User blog comment:Wrath022/Chapter 516: The Truth About Enchantment, Review/@comment-5896530-20161228013143/@comment-5303512-20161228233928

Firstly, persona defined is an aspect of a character that makes what they are, doesn't say anything about an entire entity.

With Natsu, his personality clearly changed when the demon essence was awakened, his killer instinct from his hatred, because hatred is purely instinctive. I mean, Future Rogue killed Future Lucy, he considered her just the same as Lucy, and showed the same reaction and you don't see him desiring to kill Rogue, but this time with Etherious essence, triggered by instinct made him (almost) completely different. With Brain and Zero, they are still the same person as well. Plus remember the fact that Zeref stated which would reach him first, Natsu or END as if they are two persons, but with what was shown, they are two sides of the same person and with what was shown, there was something inside the book after all.

With Wendy and Irene, I never said that they were equal, just that they use the same enchantments that perform the same function, it is as simple as that, one cancels out the other, there is no other way around it.

Despite all this, you can't deny what is factually true which is shown and explained in the manga itself.