Right, I'm going to try and do these and Humans as the first 2 factions.
Danaan will have a very diverse troop tree I hope, with a lot of options as to playstyle. They can be agressive and dynamic, or peaceful and hidden. A lot of the choices come in that, and also in deciding what the nature of the Danaan really is - will you embrace the darkness of your faction for glory and gain, or renounce it at all costs? Will you build mighty cities, or become almost at one with nture? Each choice will bring more of the most wierd and wonderful units in the game. Nature aligned danaan will gain almost animalistic troops, such as the horned and furred wild kin, whereas the night raiders use the spirit realm to create ambushes and strategies of great complexity, but at what cost? The Danaan must also be wary of the Shadow War - the Formorians, thier kin who seek nothing but to return from the shadow and take revenge...
Unit ideas appreciated! Note that each player will be able to get perhaps 10 unit types, the tree will be very much based around choosing what is best for you rather than expanding to get as many troop types as possible.
First Level
Archers
Axe Warriors
Skirmishers
Second Level
Swordsmen
Spearmen (light armed, spears+javelins)
Ambushers
Third Level
Wild Hunters
War Wains
Berserks
Xanae (low level magic)
Fourth level
Wild Kin
Sword Singers
Night Hunters (wings+bows)
Alicorniae (riders)
Fifth Level
Ojancano (giant)
Ayalga Guardians
Spirit Warriors
Night Raiders