What are Co-Commanders?

Mr. Big Bad has two or more minions who report directly to him or her, and are regarded as equally dangerous among the other characters. They will usually have distinctive personalities, roles, or skill-sets, or may perform the same job but in different regions, but just like a single Commander would be, they are answerable only to Mr. Big Bad and are significant threats in their own right. However, they don't necessarily have a team dynamic- in fact, they may not interact directly at all. If they do, they'll likely be rivals.

Simply having multiple named Evil Minions does not qualify for this trope. This is a case of several characters being powerful, important, and/or feared enough to claim the role of second-in-command or primary executor of Mr. Big Bad's will at one time. A character who does not serve in these capacities, or regularly takes orders from someone not the Big Bad, does not qualify as a Dragon, even if they're an important villain. Compare and contrast Big Bad Duumvirate, where two characters jointly hold the role of primary villain, rather than just primary minion

I bet the like having a role instead of just a Minion

Thats pretty neat