Not all half vampires are gifted with imortality. It really depends on the father's genes.  Just like humans, The father 's genes tend t get most of the physical aspects while the mother gets most of the personality aspects. At least this is how the story goes if your a male. 

This being said. He lifed a notmal human life span and his eyes were often silver/blue. He did sports when it ftted to his liking but often sat alone reading gore related things and listening to heavy metal.  He alsways dressed in black  or silver and acted like a punk whenever he was bothered. He could eat food as well though his body still needed blood to keep himself level and healthy as any other young boy.

When he did need t feed, his eyes turned slowly crimson and he normally fed off people he considered "bad". Considering he was only ten, he normally went after the bullies in his school, or the pedifilers on the street. He never killed them of course, but he drank enough to leave them dizzy an unconcous for a while. His bite also can not change others into one of his kind or make them ghouls either.

Even now, he looks up to his older sister Zrian, as she was the only one who did not ostracize him for being what he was. Tey were as thick in bond as a any bndcould be. She was like a second mother as she wasm ore of a mther to him than hisparants ever were. She taught him a great many things as well.

He tried to live true, and not disapoint Ariel. But it seemed one day at the age of seventeen, he died, having been caught up in the wrong crowd. These guys were low class thugs, using him and his strenth to make a name for themselves. As he was still human, a bullet in the right spot sent him to the grave. (If played of course it would be before he dies as his story most definatly wont change.)