6. Ahab
The influence of Herman Melville's classic novel on this comic book character need not be overstated. Ahab doesn't appear in the direct meat of the Days of Future Past storyline, but he features heavily in the aftermath as it pertains to the alternate future timeline. Ahab is a cyborg - hence Dinklage's short size wouldn't be the slightest problem - who works for the Sentinels in trying to track down and kill mutants. Arguably his most engrossing storyline involves a contemporary scientist, Rory Campbell, who discovers that he will eventually become Ahab, and attempts to stop this coming to fruition. An appearance from Campbell, as played by Dinklage, would be a great nod to this indeed. Much like Mister Sinister, his inclusion would be an easy way to allude to Apocalypse, with an Avengers-esque tease for part three.