Quote Originally Posted by The Celt
Well lets see. We've already got Kerns and Gallogliach. We just need to reskin them for the Irish faction. But we've also got stock European units like sargents, Knights, spearmen, archers,(probably not until very high level barracks) ect.
well, actually we have this roster for Archery Range:

Irish Kerns (need to be boosted somewhat, I think)
Welsh Longbowmen (they were actually hired as mercenaries)
Free Company Longbowmen (well, I guess it's possible to use them as well)

next, for barracks:
some unit like Highland Rabble
Welsh Spearmen
some kind of Viking Raiders (don't remember the Danish roster, but we definitely can borrow 1 unit from them and call it something like Dublin Vikings or Shetland Raiders, or whatever)
Galloglaich (with axes and/or claymores and in chainmail)
maybe some Hiberno-Norman Knights (dismounted and mounted), but I'm afraid it'll be mostly a fantasy unit.

in fact it's possible to borrow heavily from Scotland, as Scots fought in Ireland pretty often. that gives us Pikemen and later even Musketeers.
in later history of Ireland there were also buanadha (native Irish mercenaries) and redshanks (Scottish), but I know nothing about them.

using existing units is handy, because there's no need for new skins, just add some green, and voila.
also I think the bulk of Irish force should be quite lightly armoured and armed, but have a ferocious charge.

well, just my 2 pence:) I'm not Irish, mind you, and know nothing about Irish history, so that's mainly up to you, Irishmen:)