Because my main character is going to have supernatural powers, I have been researching various creatures, and monsters that have supernatural powers. Below are the front runners as options for what the child could be:

Vampire:
The vampire was my first thought and probably the best choice right now. It would allow the child just stumble upon his powers, by getting cravings for blood and having events build up to him coming to terms with his powers and going on a rampage. Most people also know what a vampire is and therefore it would not require much explanation as to what precisely had happened. The only reason that I would prefer to stray away from vampires is that I feel as if they have become somewhat cheapened, and overused with Twilight, and all of the other vampire romances.

Dhampir:
Dhampirs are the products of a vampire and a human mating. They get the same powers as a vampire but none of the weaknesses, because of this. The Dhampir would be a good choice, because it could help explain why the child is an orphan, having his mother die in child birth, and his father being a vampire, so he would not be able to stick around. The other benefit of the Dhampir, is that it has  not been cheapened and overused like vampire. The only real drawback is that they are relatively unknown to many people, so I would have to somehow slip what Dhampirs are into the story tastefully.

Witch/ Warlock:
Having the main character be a warlock would good in that they are very known, and there is a lot of variation with them, so it would give me a lot of freedom. The difficulty with them is that I feel as if witchcraft is something that the main character would have to learn to do, but since he's supposed to be completely alone, I don't know from whom he would learn it.

Psychic:
I explored the possibility of making it so that he had psychic powers, either allowing him to move objects with his mind, set fires with his mind, read other people's minds, control people's minds, see the future, or combinations of these. With this, I had many of the same issues and benefits with it as I did with him being a witch. I feel as if he would somehow have to be taught it, not just stumble upon it. However there could be a lot of freedom with it.

           The next two possibilities are in the case that the main character dies early on, but is somehow brought back. He doesn't realize that he ever died and tries to go back to normal life only to find that the people of the village thinks that his body has been possessed by a demon and tries to kill him.

Draugr:
A draugr is a bit like a mummy or a zombie with super human strength, and they can increase their size. Like the Dhampir this is not a very known monster, and would likely require explaining of some kind. I also believe that, like a zombie, a draugr is mindless, which would get rid of the possibility of  the character actually being a character after death, unless I went against the lore of the draugr.

Revenant:
Of the two creatures for the second direction that the story could take, the revenant is probably preferable. Like the draugr, it is a reanimated corpse, except that the revenant has an actual agenda, usually trying to take revenge on those that wronged it in live. This would make since because the kid will have been picked on and unloved. The revenant does not seem to have any real special powers with which to get their revenge.  However,  both the draugr, and the revenant are undead, and with all of the recent shows and movies about zombies and ghosts, it could make the main character unlikeable, and unsympathetic.

Other:
My last option is to create something else completely, made just from my mind, or to combine or edit some of the above options to make them more compatible with my story. None of the above are perfect, but it may be possible to mold them just a little to make them perfect.