I quite like Golden Phoenix's Idea.

from what you've suggested above, I see what you mean by the generic and the yellow trooper being more common looking but I get the impression that the other two are singular characters. What if someone else goes as the green leader? there can only be one green leader but there are plenty of yellow troopers. so if someone else goes as a yellow trooper, it would make sense in the lore of the show that there are more than one of you.

just my thoughts. as for which I think looks best. I think I'd prefer the yellow trooper design with blue or red highlights.