Him the New Men, Salem's Seven, Samhain. Chthon is in comics but maybe won't be in the movies. Oh forgot Lore.
Ok
Originally Posted by Lucyinthesky
I think Feige confirmed they would not use Mephisto so I guess they will develop other magical adversaries. If push comes to shove I could see him as an antagonist for Dr Doom or at least be referenced in his origin.