Crazylegs was the one figure I can think of that had a molded on helmet that I wished had been removable. Something about that red, round helmet was just a little silly.
BoShek from the Star Wars Miniatures, I was able to get my wish.
Now that I think about it. If you put Crazylegs' round helmet on BoShek and make it black, he'd look like a Spaceball.