7. Spider-Woman
Of course, I mean the Jessica Drew Spider-Woman rather than the many Spider-Women who followed after her. While I wouldn't necessarily suggest a She-Hulk and Spider-Woman movie n phase three, Marvel could certainly pull off a successful Spider-Woman solo film if they played their cards right. First of all, just having the word "Spider" in a character's name can't hurt. Spider-Man is so widely popular that a few fans may be swayed to give Ms. Drew a chance. Jessica is another character with a back story that melds nicely with the rest of the MCU. Early on, she was recruited as an agent of Hydra (Captain America crossover anyone?) and later became a member of both The Avengers and S.H.I.E.L.D.. It's been said that watching someone become a superhero is more fun than watching them actually being a superhero. In this case, watching Jessica Drew go from a young brainwashed Hydra goon to a badass agent of S.H.I.E.L.D. (or Avenger, even) could make a great phase three movie.