I always referred to the generic Cobra as "Cobra Trooper" or "Cobra Soldier".
Technically, the standard Cobra Trooper's code name is "The Enemy" and "Cobra" is his function or specialty. But that's just crazy.
Creating the Cobra Soldier gave me another chance to use one of the Zerboz Military figures.
I didn't do too much to him. Added a little green stuff on his face for the mask. He's got little beady eyes because the gap between the mask and helmet is pretty small.
There are plenty of soldier minis out there that would make a good Cobra Enemy. But for such a generic troop, the $.97 Zerboz Military may be the best deal.