User blog comment:IamJakuhoRaikoben/Chapter 444: Emperor Spriggan, Review./@comment-5303512-20150713200154/@comment-76.121.234.236-20150713205240

I would say a original(human) version of Natsu Dragneel due to chapter 436 or nothing? Because R-System originally was meant to revived Natsu Dragneel in a twist of irony.