good thought son the leaders, though the UUs for those civs are mostlly made up
Aremenia- Isaurian infantry
Ostrogths- Gothic Cavalary
Franks- Fancesca Throwers
Saxons- House Carls (makign one form of trooper stretch as far as I possibly can, because lets face- one germanic tribe istn really all that different from another germanic tribe

)
Roxoliani- Light Horse Archer (Sagitarii? I already gave the perisans a latinized name for thier cavalry, and the Aremnians get a latinized form of thier nations troops, so why not continue it with the Roxies as well

)
Vandals- a good question on the UUs here, I'm opem for fitting names for it- infantry would be best
Lombards I was thinking of giving Langobardii infantry- one of the few germanic nations to have non-mercenary access to orderd infantry, though in this case via a UU, after all, these guys did serve as par tof the Eastern Romes mercenary forces, and even helped to retake italy for the Byzantines (though eventually turned on them)
my main focus would be on the east- the other chinese nations, the japanese, and the koreans, as well as Arabic states, and India and what not- in other words one and all accumulte good informations on these peoples, and give your suggestions, and information regarding leaders and UUs- with specific names in addition to what they are if possible