First of all let me say that I did not come up with this idea. The first place I saw someone recast the sins with the good guys was here
You should check out her gallery, it's awesome! Anyway, I thought it was a really cool idea and sounded like a lot of fun, so here is how I would recast the sins.
Gluttony was a tough one for me to cast. I couldn't think of any important characters that were Gluttonous. So I though about anyone who consumed anything in excess, and Havoc came to mind. Then I remembered his "Stir Fry Black Hayate" incident and it was set. Poor Hayate. So yeah, it's a stretch, but I like Havoc, so
I don't think he looks very evil, but it's good enough. I had enough trouble with his head already; I'm not messing with it anymore. You can't see his Homunculus symbol thing because it's on his tongue
Drawn in pencil, colored in Adobe PS7
Ungodly amount of all different kinds of pictures used as reference for all