I am just saying since they're running out of villains from both Fairy Tales and Disney so these would make excellent choices. But that's my opinion.

Or Hades.

I could only see him or Davy Jones as possibilities.

Well, considering Dr. Whale is Dr. Frankenstein, I think it makes sense to have another classic horror character as a villain, especially if it explains how Dr. Whale got to Storybrooke when he doesn't live in the Enchanted Forest. Pitch Black would be interesting, since he's the Boogie Man and Hades, since we've seen Medusa. Maybe Davy Jones. The others are pretty pointless and kind or lame ideas.