5. Carl Creel/The Absorbing Man
Sticking with the villain theme, Wilson could play Carl "Crusher" Creel, a former boxer and criminal who drinks a magical potion from Loki and gains the ability to absorb the powers of anything he touches gas, solid, or liquid. So if he touches titanium, his body takes on the attributes of titanium, and so on. Seeing as Ant-Man has body-changing super-powers, it'd be good to pair him against a character with similarly bizarre powers. Creel's also fought Ant-Man recently in the comics, when he attacked the Avengers Academy where Hank Pym was a teacher. Creel and Hank have a shape-changing fight, driving Creel insane with the constantly shifting mass. The Absorbing Man would be a great challenge for Ant-Man to face as well as a brilliant visual spectacle in the film (think the Sandman/Spider-Man fight in Spider-Man 3).