4. Carol Danvers
Carol Danvers remains a Fan Favorite to see in any upcoming Marvel movie. She's not only a strong character with an incredible backstory, but she also has a very wide variety of enemies and storylines that can be explored in a movie. If we consider the reason why she gained powers, her origin story can be explored either at the upcoming Guardians of the Galaxy movie, or maybe even debuting as a side character in the S.H.I.E.L.D. series. Right now Marvel is going on a cosmic approach with their characters, Carol Danvers is the perfect choice to be shown in Marvel's Phase 3. A movie based on her character would be a great idea, with the right director and a script that can show her as the incredible superhero we all know and love, this has the potential of becoming the next Iron Man. And besides, since the only female characters we have so far in The Avengers are Black Widow, Maria Hill and Gamora, she would be a great addition to the team.