Demons (who just possess people) - vampires (who used to be all human) - shape-shifters (self explanatory) - ghosts (who used to be live human beings) - angels - a Trickster (who is a demi-god who can look like a human *or make you think he's a human*) - Djinn - the Grim Reaper - Werewolf (when they're not changed) - then there's the evil monsters we call humans (people LIKE Hitler, H. H. Holmes, Miley Cyrus, *just kidding... more.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.