#6 Hellboy
Now maybe you feel that this is more of a make-up job than a costume, but to me it still qualifies.  In fact, Hellboy’s look for the movie is one of the most comic accurate comic book translations to date, filed-down horns and all. The Right hand of doom, his over-sized revolver, and the trench coat all help to complete this masterful makeover.

Oddly though, my mother says that Ron Pearlman as Hellboy, bears an uncanny resembles the former governor of Minnesota, Jessie Ventura.  I guess I can see that.