Here's my entry! About 15 minutes to spare I believe... -edit- Ha! I totally had last Sunday's deadline in mind, the contest still has time to run! I'll craft a standalone post a bit later as well. I went with @kommienezuspadt's suggestion of Marv from Sin City. But since Marv is at the edge of the superhero genre, I gave more of a nod to the theme by mashing him up with an iconic Superman image by Alex Ross.
I did learn that when drawing Marv it's rather impossible to not have a little Frank Miller hanging out... that's not a euphemism, this post is still safe for work!