Quote Originally Posted by kuroihikari View Post
Alternatively, you can look at the consistent styles in Mashima's former works (Rave Master, Monster Hunter Orage) and history (He and Oda were both Watsuki Nobuhiro's assistants), and make a more educated, fair and informed guess that he and Oda worked together and thus they have similar styles.
Still, I doubt Fairy Taild would have been any outstanding shonen if Eiichiro Oda didn't publish One Piece with similar style. I think we all agree Hiro Mashima owes Oda part of his popularity.