Steve is a Hufflepuff and I won't hear otherwise. His whole reasoning for taking the serum is that he dislikes bullies- he's brave, sure, but he falls much more on the "fair" side of things. (I may have been known to call him Captain Hufflepuff at times. I regret nothing.)

I also cast Fury as a Dumbledore-style Gryffindor. If you think about how secretive and manipulate Dumbledore was to Harry, all the expectations he piled on, there are a lot of similarities there. Fury isn't necessarily ambitious or cunning, but he certainly is about Right and Wrong and I think the black-and-white mentality is more Gryffindor than Slytherin.