8. Falcon
Falcon is looking to make his big-screen debut next April when Captain America: The Winter Soldier hits theatres around the world. Behind only a few, Falcon is one of Marvels first major black characters, and will be the first major black super hero in the MCU. In thecomics, he has endured on-again-off-again runs where he has enjoyed some popularity, but it hasn't been until recently that he has gotten his first major push. In the upcoming Captain America sequel, Falcon is a S.H.I.E.L.D. agent with military training and tactical superiority. Much like my argument for Crossbones, I think it would be cool to see him in an episode. Even if it wasn't as part of the weeks plot, it might be fun to introduce him through a conversation with Coulson, or giving a tactical briefing for the team's current objective. Using a new character like this will only increase its popularity before going into the big premier.