I choosed Dwarves and Lothlorien , but I think they should add :
* Dwarves: all his faction + its alliance with Dale
* Elves : with its 3 Factions: Lorien , Rivendell ( Imlradis ) and Mirkwood , each with its own magic , though they have many similarities , but they are different in some ways all at once
* Harad : Men who help Mordor with its own magic , as they did in Rj - Rotwk (which admittedly created them quite well)
Finally : Angmar, it is important to know that wars were those generated Arnor
and I think the Goblins are a race that added in the "Battle for Middle Earth 2" just to add features, but not really there.
The goblins are just mere product of orcs mountains