No prob on the back story
I've already figured out how I could make my pc's existance... believable.
Readers Digest Version
Ok so my PCs mother was a Nephilium (Basically an Angel) she goes off to fight against evil and gets captured... My PCs father a Cambrion (A Winged Deamon)... being evil, ends up raping the captured angel. After some time my PCs mother escapes... how I'm not really sure as of yet. She returns to her own lands... but now carrying a deamons seed in her... is well shunned by just about everyone of her own kind. Most of them suggest killing the child at birth to prevent allowing the possable abomination into the world. She runs away with the help of a few like minded friends and goes into hiding, and ends up birthing the child on her own. The baby ends up exibiting both angelic and demonic traites. With Angelic Wings, amber coloured eyes, dark tanned skin, clawed fingers, and the beginnings of horns on his head (The horns being like Hell Boys when he is really mad. You know the big ones.)
Being a merciful being my PCs mother decides that rather then killing the newborn, she would try to raise him in such a way the his is able to be good, with out acting on his demonic impulses. but unfortunatly word of the child has manged to get out to bith sides.... demonic and angelic forces press in to destroy my PC... the mother and child are hunted and in one particually bad encounter my PCs mother is killed buying time for my character to escape. He growes up alone, forever wondering... looking for his little peice of peace, goes on a few adventures hones his fighting skill with two baldes... yadda yadda yadda.
I'm going to try to take a scientific approach to making my characters stats up... I'm going to make a genetic table out of each races stats and work out the dominant genes and submissive genes and see how things turn out.