The What: A Phoenix is a mythical bird that lives between 500 and 1,000 years. At the end of its life, it builds a nest out of twigs and then bursts into flames. Both the nest and the bird are burned to ashes, but from the ashes arises a new young bird, reborn and ready to live again.
How It Could Work In An Episode: Here is another creature that couldn't literally be put on screen because that might be too ridiculous. No, instead, what if some other creature had phoenix-like capabilities? Or what if you had a spirit that was hurting people, and when Sam and Dean went to burn the bones, a new and stronger spirit emerged from the ashes? I think that would be pretty cool twist on the traditional salt-n-burn.
4. Shadow People
The What: Shadow people are humanoid forms or spectres that are seen in peripheral vision. They are very evasive and avoid direct lines of sight whenever possible. That's pretty much it Why are they so high on the list then? Well...
How It Could Work In An Episode: Have you ever been walking somewhere at night and the hair stands up on the back of your neck and you just know that someone is watching you? You stop to look, but you can't see anyone. So you continue on your way. But there it is again, that feeling of someone watching you. You stop again, turning your head to and fro, but you just can't see anything. So you start walking yet again, your feelings of panic rising because you know there's someone, or something, out there in the dark. You stop for a third time, and as you look around, you swear you spot a shadowy figure in the periphery. You turn your head to find it, but it's gone again. It's always just out of eyesight. You shake your head to clear the cobwebs, and for a moment, you think you're going mad. Did you really see something in the shadows? Or are you just being paranoid? Then BAM! The shadow person attacks. Of course, in the Supernatural world, the shadow people would be bloodthirsty killing machines.
3. The Bogeyman
The What: The Bogeyman is a legendary creature. Almost every culture on earth has their own version of The Bogeyman. For that reason, The Bogeyman has no set appearance or set behaviors. It's pretty much just the ultimate threat monster. "You better behave or The Bogeyman will get you!" How It Could Work In An Episode: Really, how could this monster not work in an episode? It's the embodiment of evil and fear for children around the globe. Who wasn't scared of this guy crawling out from under the bed or from out of the closet? When I was little, my bedroom had this wallpaper that had really strange patterns on it. I was convinced that when my parents tucked me in and turned off the lights, the patterns started forming into monsters, and the monsters were trying to crawl out of the wall. Needless to say, I was petrified and didn't get much sleep in that room. My parents had to pull down the wallpaper, too. So as an homage to my greatest childhood terror, how about a Bogeyman that comes out of the walls? I'd also like to see Sam and Dean kill The Bogeyman. But when they leave town, it just comes back to life. It's one of those creatures that exists because so many people believe it does, and no matter how many Bogeymen hunters throughout time have killed, it's just going to keep coming back to life.