i would use the cruciatus curse on him for several days. then i would use the inperius curse on him and make him kill many of the OOTP members then when he came back to me i would then use the cruciatus curse agian and then i would finialy make himself kill himself..
I would throw a tantrum, shrieking and hurling insults at anyone within earshot while beating the floor and the walls and committing various actos of vandalism and pyromania, making sure to take so time to sob and scream over Voldemorts dead body, and prevent anyone from coming too close. Then, to make myself feel better and "In Voldemorts Memory", go and torture some innocent people with the cruciatus curse, and laugh if any of them die. Then, go and hunt down and hopefully kill any death eaters left that weren't nearby for "not being around to protect voldemort" Then devote my life to finding and torturing Harry and all Order of the Phoenix members, while remembering to torture, maim, and kill at least one person a day, to honor the Dark Lords memory, and to continually prove my loyalty, even though he's dead.
All the while hoping he'd প্রদর্শনী up in my dreams, *sigh*
I would imperio him into convincing the wizarding world that he shouldn't have killed Voldemort, I would make him lose all his বন্ধু and damage his life beyond repair, and then I would un-imperio him and watch the fun. And if, for some reason, he managed to find mutual love, I would wait until he had his family gathered around him, and then I would reenact the killing of his parents when he was 2. Except this time I would kill him. After that, I would continue the work of the Dark Lord so that even in death he would reign forever. Harry Potter will never kill আপনি my Lord! Nothing's going to harm you, not while I'm around!