Kytra is a human who always hated the world and wishes it was a better place. Once her death occurs she is to go to heaven which she rejects and stays in the world to purify it.
Demons are vile creatures. They kill, they torture, they do anything to satisfy their nasty needs. They have no order. They're just lost souls of humans who went to Hell. They have horns that grow up into the sky, wings, claws that rip through skin, sharpened teeth, and no remorse. They live in the fiery pits of Hell and they enjoy it.
That's not exactly true.