User blog comment:Miskos3/Fairy Tail 544: You're the King, Review/@comment-26099879-20170714192815/@comment-7418318-20170715075023

And as Misk hinted at, Naruto isn't exactly the most innovative series either. If you do some research you'll find heaps of stuff in Kishimoto's work that coincides with earlier works by other people (not blaming him for copying mind you), including Hiro Mashima's previous work RAVE Master.

Also don't forget that almost everything in Fairy Tail has an equivalent in RAVE Master. You can hardly complain about Hiro Mashima reusing his very own designs from his earlier works, just because somewhere in the years and decades between them some other mangaka got inspired by those designs.