I think that there should be multiple provinces of the demon faction that are situated next to those of the 5 factions. Each demon province or group of provinces will be able to recruit different types of demon according to which faction they will come into contact with. This would mean that each faction would have its own culturally unique demons to fight, making the battles more believable and in-depth. I am not proposing we have many different demon factions, although that would be even cooler (demon civil wars, etc.), i am only saying that the demon faction should be more spread out. Demons should be the worst fears of each civilization they are in contact with, and having them have different territories from which different demon armies emerge is much more exciting and believable. Below i have put together a rough draft of the kinds of demons that could associate with each faction, i hope you will consider this idea.
Japanese/Korean Demons:
Basket Demon Ronin
Undead Samurai
Zombie ashigaru
Ghost Geisha Fighters
Bakemono
Noh Demons
Chinese/Mongol Demons:
Rokurokubi
Shreeking Hags
Snow Monkey Infantry
Wang Liang
Shishi Riders
Beast Riders
Copper Dragon
Indian Demons:
4-arm Demons
Kappa Archers
Hanya
Tengu Camel Archers
Elephant Tower
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