" There a lot of anime characters that look a like. Fairy Tail's author even said he was influenced by One Piece that why the art and characters look the same way. Can you point how there Fairy Tail character personality are the same as One Piece character? Fairy Tail have a nice story that don't go all over places. "Hmm, I don't understand how you can say this now but a few posts above you were saying One Piece and Fairy Tail weren't similar at all.
As far as personalities, Natsu = Luffy. A loud mouth guy with a heart of gold who loves to fight and eat. Both of them aren't the brightest person that you'll run across, but they have a fierce loyalty to their nakama, a word that both of them shout no less than 50 times per episode. Along their journeys they meet up with a rag tag group of misfits, all of whom have some super tragic background. One of their companions is a large breasted young woman who looks cute but has a sharp mind and can slick talk or finagle their way out of situations and she plays the role of the one semi-sane person in the crew who can keep a level head when everyone else goes fight crazy or is being careless. Both of them even have comedic small animal sidekicks.
There's probably more direct character comparisons to make but I don't know anything about OP after episode like 122 and I don't know anything about FT after episode 32.
The art styles of the shows are super similar and on top of that, the characters of Fairy Tail kinda dress like pirates do in One Piece, which is super odd considering that the show is about magicians... although if you're copying One Piece I can understand why you'd style them that way.