Godlike is also an apt descriptor for these four, probably the most physically powerful characters that will exist in this campaign. Hercules might be available as a playable character since superhuman strength is his *only* power, but the other three are just as strong and can also fly and do other stuff as well, so they are all strictly NPCs. Fighting even one of them would be an epic encounter...
Bonus: another Superman vs Namor staredown vignette, using custom Chicago scenery (more on that later)...