User blog comment:Miskos3/Fairy Tail Chapter 506: The Broken Bond, Review/@comment-5303512-20161017131353/@comment-1359322-20161017150540

The demon mark corrupts Gray so what? Does it mean that Gray won't be Gray anymore. He'll completely becomes a separate entity? He'll no longer care about his friends. He'll ignore Juvia completely even if he finds out she's alive.

Natsu is E.N.D., regardless of what form or appearance he becomes, he won't lose his identity as Natsu.