User blog comment:Shrek-it Ralph/Who should Freddy Krueger's Opponent be?/@comment-7424710-20160206021422/@comment-27031114-20160207065230

For Joker, they are both insane, evil master minds

For Alucard, they are demons that haunt people

For Ghost Rider, pretty much demons with fire

For Shao Kahn, they go after people's souls and they have unique ways to kill people.