Cobra:

Cobra Commander (Red Hooded),
Cobra Sub Commander (Blue Hooded)
Cobra Field Commander (Black)
Cobra Sub Field Commander(Blue)

If they're going to put out multiples I might as well give them something to do.
Battle Armor is for space missions. He usually meet Darth Vader on these outings.

Baroness is Second in command.

The Twins serve as admiestrative advisors.
Dr. Mindbender works for Cobra, but is not involved in command decisions.

All other specialists are mission specfic.
Destro pulls the most influence, but I do not consider him an official member of the organization.

Zartan, Firefly, and Bludd work for hire.