Luffy's most dominant traits are his apparent lack of common sense, his utter fearlessness and unwavering belief in himself. He generally marches at the beat of his own drum, unwilling to approach anything in a delicate or nuanced matter. He is profoundly ambitious, frequently declaring he will become the Pirate King and devoting his entire being into being one. Luffy's personality can be described as childlike, in the sense that he tends to go to the extremes. Monkey D. Luffy from One Piece.