I spend so much time focusing on the human half of my heritage that I often fail to consider my demonic parentage as anything more than the source of my powers and an accidental confluence of genetics. However, there are definite influences upon me from that quarter beyond my magical talent and exotic countenance. My demonic aspect is so often corralled by my Azarathean training that even I sometimes forget that it has a profound effect upon my mind and physiology.
For example, demonic beings are much like other creatures in that they are uniquely suited to their placement in outsider-nature. Some demons are little more than beasts, and they feature many of the animalistic traits their mortal counterparts do. Demons short on intellect but large on feral ferocity tend towards the extremes of specialized killing. They are strong and vicious, or silent and poisonous, or feed upon carrion, or any of a thousand other possibilities. More intelligent demons are less bestial but no less savage. My father, for example, is an example of the pinnacle of the demonic hierarchy. His form is mutable, his strength immense, his cunning unrivaled, his power unmatched. I have gained much from him. My form is fluid, the better to meet any challenger to my dominion. My teeth are ridiculously sharp that they might better slice through the mortal flesh which my body craves. My eyesight is keen in both darkness and light, my hearing predator-sharp. Strangely, I remain relatively frail, although that is more than compensated for with my powers, which are largely untapped.
Furthermore, my mind is not entirely human. Demonic impulses scrabble and tear at the fortifications of my consciousness constantly, howling at affronts and keening for blood. It's disconcerting that I find Robin to smell delicious. My genetics realize that they are being restrained and continually fight against me in the desire to seduce, enslave, consume, destroy, dominate...
Yet, another thing that my father's legacy left to me is a deadline. My body, evenly divided between immortal and human, is unstable. One I reach maturity, the demonic half must be allowed dominion over the fleshy abode of my spirit or it's energy will become unmaintainable. In short, I would atomize into a cloud of negative energy, blood and gristle. This should have happened shortly after the time when my father used me to enter this world, but the gathering and focusing of energies through me actually depleted my energies to the point of regressing in age. Not much, and certainly not enough to be readily noticeable,but enough to delay my eventual conflagration. And, make no mistake, it is both eventual and inevitable, because if there is one thing I am sure of, it is this:
I would rather die a mortal demi-demon than live as a Nephilim.
--Raven