>>42367986First I need to make sure you understand that the Aztec Empire wasn't an Empire as we would consider one traditionally but informal and the Mexica themselves never claimed to have supreme authority over their many tributaries.
>Council of Four.The Council of Four consists of four very powerful men and generals of the army who were first in line to become the next emperor. They gave advice to the emperor and it was very important that he had their agreement in major decisions. The Council of Four are the people that elects the new emperor after the previous ruler has died. The Council of Four must choose a new emperor that was related to the previous ruler. They normally chose the emperors among the brothers of sons of the deceased ruler. They had to be nobles and over the age of 30. They had to be educated at one of the elite calmecac schools, experienced warriors and military leaders and they had to be just.
https://aztecsrcool.weebly.com/positions-of-power.html#:~:text=The%20Council%20of%20Four%20are%20the%20people%20that,be%20nobles%20and%20over%20the%20age%20of%2030.
>TlacochcalcatlWhat we would call a Field Marshal, basically the second in command of the whole army. Led it into battle if the King was absent with the Tlacateccatl. Always a member of the military order of the cuachicqueh "the shorn ones". Usually also was the successor of the King.
>TlacateccatlSimilar to the Tlacochcalcatl, translates to general. In charge of the tlacatecco, a military quarter in the center of the Aztec capital, Tenochtitlan. Also was always a member of the military order of the cuachicqueh "the shorn ones".
>Ezhuahuacatl "Raining Blood" or "Shedder of Blood," an executioner; an advisor to the supreme leader of the Aztecs; an officer of the court.
>Tlillancalquihigh judge, i can't read spanish for more information.
>Triple Alliance.This was a common form of politics in Mesoamerica. The Tenochtitlan, Texcoco and the Junior partner of the three, Tlacopan. Basically what happened over time was Tenochtitlan became the most powerful of the three, sort of the parental figure in the alliance, but the others were allowed to share in the spoils of war. I think they both had resentment about this and this caused both of them to become traitors during the fall of the Empire.
Overall, in terms of /meat/, you first need to decide if you will model the Mexica directly because if so, one city will be powerful and the rest will be tributaries or members of an alliance. This could actually be interesting because it could help explain some problems you have now and furthermore, would allow you to have things like Flower Wars, which i unironically imagine you guys having.
I copied a bit from wiki to make sure I am correct.