Way too similar! And let's not also forget the resemblance of Gajeel and Monkey D. Dragon. I watch both Fairy Tail and One Piece but I'm very much a bigger fan of OP, and seeing OP characters getting somehow "ripped off", makes me a bit frustrated. It would be better if Mashima-sensei kept his character basis at a minimum.
i know that the man that is doing the FT is the right hand of echiro oda the creator of the moste amazing anime that i have seen so they probabbly help each other and in other words the personallty of some characters from FT and OP have some similaritis like and they have that childis comedy both of them and its nice but still one piece ruls the only thing that was better in FT are the soundtraks they are really good