(The answer is this) To hide the large scar on his face. If you look at him really carefully from the front, his hair is parted ever so slightly to the left (his right), and he has a little more hair covering the right (his left) side of his face. I suppose you could say that he isn't quite fond of that particular scar.
(Personally, it would satisfy me most if 3 ended up being the answer.) (Oda said this)
*cough* ship
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