I'm going to be predictable and say vampire. However, I want to be a Twilight style vampire with two conditions. One, I do NOT sparkle. Two, I can still drink human blood. I've actually tasted human blood and it tastes quite nice. A bit salty, but otherwise really delicious. And I can say truthfully that I'm being deadly serious there.
Anyway, non-sparkly Twilight vampire means I'm able to go out in sunlight, without being laughed at/flamed. I get pretty much all the traditional vampire strengths and no weaknesses, with the only way to kill me being to rip me apart and then burn the individual pieces (has to be that order too, fire doesn't otherwise then hurt me).
Incidentally, I've attempted to write a vampire novel based on this type of vampire. However, although the characters are good (I've been developing them in my head for ages and they're NOT Mary Sues) and th story's okay, I got writer's block and scrapped it. However, a short story series (Digs) that I posted and then gave up on at this site is now at the forefront of my mind, so I'm probably going to end up rewriting that but making a few basic changes, and changing aspects to make it a paranormal style novel (since I've recently been coming up with great ideas for such a style)...
Oh, by the way, no need to worry. The blood I drank was my own. I realise this doesn't sound much more reassuring, but it's only if I scratch myself or something and there's a little bit of blood. Sucking on the wound helps sterilise it apparently, so I end up drinking blood that way. I'm not psycho. Seriously. As unlikely as that seems...