the dude from rogue one with the black biker scout helmet.
i've seen rogue one twice, and both times this guy stood out to me. he's a soldier of saw gerrera, seen for a brief second when bodhi first turns himself in to saw.
I tried to find reference pics, but failed miserably, so all i had to go on was what i remembered from the movie and a general sense of what saw's troops on jedha would look like. he's mostly gi joe parts with a POTF2 biker scout head.