9. Jack Trueman aka Deathlok
Deathlok is a superpowered cyborg created from a dead body. Through cybernetic enhancements, Deathlok is able to repair any damage to his body, and is able to track and shoot multiple targets. There have been a number of different incarnations of Deathlok, one of which, Jack Trueman, was a S.H.I.E.L.D. agent. There are many different ideas that could be explored with Deathlok including issues of humanity, purpose in life and the ethics of creating a creature such as Deathlok. Deathlok would make a great addition to the S.H.I.E.L.D. cast, and could even be a late addition to the cast based on a dead team member, maybe even Deathlok Coulson.