11. Nick Fury

Like that of Black Widow, Nick Fury's history has been retconned a couple of times. We’ve learned that he stays young (so to speak) through the use of a super-serum known as the Infinity Formula. However, he’s earned a place on this list because of his other skills, which don't involve mumbo-jumbo science.

Fury is a war veteran who served in WW II, the Korean War, the Vietnam War, and a number of other conflicts. He became a Green Beret, a paratrooper, a demolitions expert, and a Ranger, picking up a number of skills and abilities along the way.

In addition, Fury is a heavyweight boxer, a versatile martial arts expert, and a marksman. It’s no wonder he’s led S.H.I.E.L.D. for such a long time. He's changed his appearance over the years, but he’s one awesome character!