[Wrana]

On Fomoria: I agree that they have SC potential. But - 1 eye. And their giant troops are really weak against any decent swarmers. I rushed them once and they just died... An alternative could be to use just Nemedians for expansion - but then, why not play a real Sidhe/Van nation?
ON Yomi: I think something like Tempering the Will may be useful. And they DO have useful troops in their goblins. It's only that Shinuyama is better - and there is fierce competition in EA...
Monkeys are good enough, I think - except Patala with their strong, but overencumbered mages. And cold-blooded with Water magic, no less!
On Agartha I may be wrong. But there are other Earth nations - with better troops.