Lorewise Lorien and the Woodland Realm could be separate factions. Celeborn and Galadriel ruled Lorien without anything to do with Thranduil. About Rhun and Harad, one cannot be sure if they are descendants from Ulfang, or another house that didnt come to Beleriand. Personally I like the later more, but thats just me. The easterlings where divided into loads of tribes, the balcoth, the wainriders, the variags(khand) etc. All haradrim arent called trollmen, but there was some kind of trollmen from Harad