Here is a basic overview of my character:
A long time ago, a mad necromancer found a strange artifact with a certain shimmer to it. He toyed with it in his office for a long, long time, but was unable to create anything interesting with it. Frustrated, he surgically implanted this small artifact into the body of an already-dead human child (age 14, male).
Years passed, and nothing happened to the body. More time passed, and the necromancer grew old and died. One day, the body that was buried behind the necromancer's house suddenly started wriggling and jerking, and started to move. The artifact planted into the child's body had learned to control the body, and use it to move around and explore. Hundreds of years passed, and the artifact was still able to control the human body (it was now decayed and rotting, of course).
As it turns out, when the artifact was implanted into the body of the boy, the boy's soul became entangled with the artifact. Now, the boy is able to control his own body, but on occasion, the malicious urges of the artifact override the reason of the child, and overtakes his body.
The child remembers his village being burned and pillaged by the demons, and remembers his family being dragged off with the demons. He survived by hiding in the basement, and had to watch his life crumble before him.
In his hundreds of years alive, he learned advanced medical care, and is quite capable with a large, heavy battle axe. He also learned to regrow his flesh using the artifact energy, and can generally hide his zombie traits.
Overview:
14 year old zombie, powered by energy from a demon artifact in his chest. Can live for long spans of time, flesh decays very slowly. Wants to avenge the death of his village and family. Generally in control, but sometimes prone to the malicious urges of the artifact.
Skills: Advanced medical care, and advanced battle-axe-man-ship. Also is able to disguise his zombie-ism, and comes off as a regular human most of the time.