I think that "the scariest" guy can't be picked. It really has to be a group of them. I think that the best group is that of the 4 basic killers
Michael
Jason
Freddy
Pinhead
If you really think about it, theses four working together would kick everyones ass. You got Michael and Jason who are practically unstoppable, and are hard mother fuckers to kill(if you get lucky enough) Freddy can get you in your sleep, so if you aren't running from one of the guys in the real world, sleeping somewhere isn't going to save your ass. And Pinhead if you run across Pinhead, there is no way you are getting away so you are fucked.
Just as Kelly Rowland said in FvJ
"We're not safe awake or asleep."
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launch box vaporizer