Laertes

           "For Hamlet and the trifling of his favour, Hold it a fashion and a toy in blood, A violet in the youth of primy nature,"(I.3.17)
           Like father like son. Laertes gives his sister a book-full of wisdom for her to keep in mind while he is gone, and five mintues later his father comes in and gives Laertes a volume. It all a sort of pun. The two are similar in their own ways.
             
              "I stay too long. But here my father comes. A double blessing is a double grace; Occasion smiles upon a second leave." (I.3.52)
              This statement by Laertes can be interpreted with an ironic twist, but I do not think so. I think Laertes here briefly expresses his love for his father. He wants to see his father once more before he departs for Paris and is glad that he catches him. Apparently, Laertes is ignornant of the superfluous wisdom of his father and almost looks forward to them, saying that it is good luck that Polonius has gotten to bless him twice.

             "Let come what comes ; only I'll be revenged most throughly for my father." (IV.5.38)
              Yes, Laertes does love his father. His willingness to storm right up to the castle and demand of the King the soul that he should kill for the sake of his father's revenge is proof enough that he is serious and geniune. His response to the revenge of his father demonstrates more of a "let's get this done" attitude than Hamlet's reaction to his own father's revenge. He does not waste time seeming like he is mad, neither does he hire actors to put on a mock play. He gets right down to business, ready to kill Claudius right there and then if need be.

              "My lord, I will be ruled ; The rather, if you could devise it so that I might be the organ." (IV.7.91)
              Here, we catch the bloodthirstiness of Laertes, who is willing to bend down to the King in order to enact his revenge. This yielding exhibits the truthfulness in his expressions for pure, unadulterated revenge. Quite opposite of Hamlet, who bows down to no one.

            "Why, as a woodcock to mine own springe, Osric; I am justly kill'd with mine own treachery."  (V.2.28)
             There is an admirable sense of honor in Laertes that shines through his words and actions, even if they are murderously directed at the story's protagonist. Though he has taken up a non-noble method of slaying Hamlet, he confesses that it was indeed "treachery" and he has "justly" been killed by his own doing. In some ways, Laertes reminds me of the byronic hero, but he is far from being one. He is the bad/good guy here.