Arameans : religious, expansionists
Elam : militaristic, commercial (?) , Leader : Shutruk-Nahhunte (captured Babylonia from the Kassits and fits your time period).
Arameans because they were nomads and came from the south and because they were religious. On the other hand they were divided in small tribes as much as I know so no clue for the leader. For the UU, probably a light infantry one such as a javelineer.
Elamits are not specially famous for much. But since they were living on the sides of mountains where stone and timber were found then exported to Mesopotamia proper I think commercial would fit. Then religious or militaristic for the other trait.
For the UU, no clue.
Hope that helps.