The categorisation cannot be clean cut, because it mixes forms of government with sizes, which is related to how heterogeneous they were. Taking what they were for the most time (Macedonia was an Empire for a very few years): Tribes: Britons, Gauls, Iberians, Germans. City-states: Athenians, Spartans, Thebans. Republics: Romans, Carthaginians. Kingdoms: Macedonians, Ptolemies, Kushites. Empires: Seleucids, Persians, Mauryans, Han.    

He didn't want to have it anymore, but wanted his posts to stay around.

We actually have rome go from republic to empire, they are currently the only Empire Kush is a tough one

What happened to his account??

My take: City-states: Athenians, Spartans, Thebans Hellenistic Empires: Macedonians, Seleucids, Ptolemies Eastern Empires: Persians, Mauryans, Han Republics: Romans, Carthaginians Tribal societies: Britons, Gauls, Iberians, Germans I cannot place Kushites though...