During the Battle for Gobwin Knob, the Blue Warlord was a female commander clad in blue livery and a member of the war coucil of the Royal Crown Coalition.Erf-b1-p49 By process of elimination, she represents either Hobbittm or Unaroyal, with Scarlet representing the other.
She ordered forward the siege when Ansom assailed the wall alone. Erf-b1-p118 This indicates either she was a 2nd or 3rd in command for the coalition, or that large numbers of the siege came with her side. This would seem to support the idea that she is from Hobbittm, as their small overall numbers would be much more of a contribution if they included siege, and several blue-liveried troops are seen attacking the wall with picks and other tools.
On the other hand, she may merely have been the first of all the Commanders to issue the order, rather than having any rank above others in the Coalition. If that's the case, she could still equally be Hobbittm or Unaroyal. Given that blue-liveried troops feature as heavily in 139 through 141 as any other Side, it is impossible to say which is Hobbittm and Unaroyal. Hobbittm should have 1/8th the presence of Unaroyal troops, but the difference is nowhere near that severe.