User blog comment:Tyrone851/Fairy Tail Crossover Movie (including DBZ, One Piece, Naruto And Bleach)/@comment-115.64.67.64-20140307073937/@comment-92.233.217.42-20140427042226

Both Fairy Tail and One Piece are both ripped off (artistically speaking, of course) however, it's not considered a 'rip-off', more so than inspiration. They were inspired by Dragon Ball.

Eiichiro Oda and Hiro Mashima are both members of a generation who grew up obsessed with Akira Toriyama and all things Dragon Ball, and whose styles were forged by Toriyama worship. Another reminder that even masters like Mashima and Oda started out as the same thing: fans.

So, well, yeah.