My first thought is Hancock. A thug clowned him at the end for "wearing that tight-ass X-man suit."lol. So maybe the X-men exist in his universe. So it'd be an easy to segway. He's make a great Avenger and fit right in the MCU.

Second I think about the Scorpion King played by the Rock of course not those dtvs. The MCU could pull of a proper sequel maybe have him turn out to be a good king.