User blog comment:Mamerge/What if Natsu is END? And Silver is Future Gray?/@comment-149.153.1.40-20140411095917/@comment-98.116.168.20-20150416205113

It was revealed that Natsu is e.n.d. (And Natsu is a demon, and i highly doubt demons have birth parents seeing as how they were all creted by the same guy)