As usual, a couple of these guys look like they might be sort of cool. I don't remember freaky wide-mouthed guy at all.
Here's a Gungun you might not want to punch in the face (looks like a quiet one).
Normally I'd be all "grooooaaaan, another Vader?" but this one has a skull! See?
If it wasn't already obvious that the Dud Bolt head was a prototype, the rubber band holding it on really nails it.
See the rest here.