Some ideas to help the brainstorming along:
Penguin from Batman
Not exactly Western comics, but here are a few widely recognized "Western" ideas:
Orc from World of WarCraft (would require some theatrical make-up, though, and I know that isn't everyone's thing)
Buzz Lightyear from Toy Story
Mr. Clean from the Mr. Clean product line (I know this isn't really any sort of "standard" cosplay, but I figured I'd throw it out there - it might be fun for something like Halloween if nothing else)
Hope these ideas helped the brainstorming a bit!