Jack of Hearts
Real Name: Jonathan "Jack" Hart
First Appearance: Deadly Hands of Kung-Fu #22
Why: Hart has comic book connections to both the Avengers and S.H.I.E.L.D. His unstable powers wouldn't be cheap to reproduce on screen, but would be an intriguing "problem" for S.H.I.E.L.D. agents to try and help him contain.
Why Not: He could be a character Marvel Studios wants to save for an "Avengers" sequel or different movie property down the road. Also, how epic could they make Hart appear with their current production budget? It might be a tough call.
- Gregory Ellwood