The Grim Reaper is your dad. You're his only kid. He's a stern man who doesn't seem to have emotions, but he does have a soft spot for his kid. He goes by Grim sometimes. He doesn't like what he does, he isn't heartless; but you both can lead your normal, solitary lives with each other and no one else now, as you've developed all creatures, diseases, etc that could cause death...and you now have spirits in place of you.
"The death count has been rising," Grim said as he walked in, his long cloak at his sides.
He was a tall man, muscular and normally shirtless, with red and black streaked hair. He had the appearance of a man in his late thirties to early forties. He took a sip of his tea, sitting at the long table in the large castle that you both resided in.
"Eat your supper."