Okay so who would be my anime rival/enemy???
I would have to say Eustass Kid. Out of all the One Piece characters he seems like my rival the most. Not only that, but he seems to start a rivalry with anyone and everyone.
He also seems to have hate Law more than others, Law being my favorite character and all, this might cause more friction between us if I was in One Piece.
Even despite all that, and him being a major douchbag, he is on of my favorite characters, but I still don't think we would get along. We are both to head strong and, only sometimes for me when I'm dealing with people like Kid, hot headed to probably get along. xD