I'm guessing I would be originally a strikingly handsome cambion. But then in an epic battle that resulted from my father striking out against my mother in a bid for freedom, my handsome form would be split into two "halves". I could then either appear in the form of a gnarled, old human male, or as a bloated, red-skinned demonic figure. In my demonic form, I would be seven feet tall, with reddish skin, pointed ears, and long, steely fingers. In my human form, I would be barely five feet in height, and could attack with a disgusting spittle that withers all that it touches.
I mean, hypothetically. Hard to be sure, specifically.