Ok I think this should be somewhat of intelligent discussion (not that I am calling this placce stupid). So do you agreed with that the tribes correspond to the appropriate government?
Overworlders: Democracy; We all know that even though Maxxor is the leader he is no king or any other fancy title, just leader, thusthere is no one ruler. Also no actual chain of command has been seen thus it has to be democracy for all the Overworlders cooperate with each other instead of obeying a superior.
Underworlders: Tyranny, Authoritarian; Seems pretty obvious as most dark demonic races or countries are ruled by a single person. That person for the Underworlders just happened to be Chaor.
Mipedians: Confederacy; Not why did I assign this government to the Mipedians, because as you read on chaoticgameplus that they Mipedian are ruled by a battling royals. So the Mipedians are ruled by many warlords each with own turf. Since they each of them seem to have their own "little" army, they must have made an alliance with each other, and pooled their troops to fight the other tribes.
Danians: Parliamentary monarchy, fascist, Hivemind?; Yes you usually think that it would just be a plain monarchy as it is one big ant colony, however in "buggin out" did you rememeber how the maniblor guards complained about the "tribe council". Well there's the parliament part of it. Then you saw how all the Danian cards, mostly battlemasters, always had "something somerthing for the hive". That could be your fascism. Also, I would to add there might be a possibly of a Hivemind, like Borgs from Startrek. Although it would have induced as each Danian has their sentience. If their is a Hivemind well whoopdee-do there is no government, as the entire tribe is one entity.
I am an Enlightened Despot, not a tyrant.
But a dictator no doubt.