Who would the worst possible existing killer to add to DbD be?
It doesn't necessarily need to be something from movies, as long as it does already exist in fiction and is not a classification such as "werewolf" or "vampire." Be specific. They must be humanoid.
I vote Jeff the Killer. Worst fictional serial killer I have ever seen. Has nothing interesting he can do. Looks dumb. Etc.
If we're talking killers that are actually from horror icon material I would say probably The Creeper. Just because flying would not work well in DbD and throwing things has already been done. There's nothing that could be done with him.