Unaroyal is a side in the Royal Crown Coalition. Its infantry units are clad in red and orange livery.Erf-b1-p128 Their banner seems to be a black torus with white lettering, on a red and orange field.
It sent 1714 troops into battle, led by the Warlord known as Scarlet. This was the third largest force after the Marbits and Jetstone. They were wiped out in the battle and the volcano eruption that followed.
Seems to be on relatively good terms with Transylvito.
Real World References
"Unaroyal" is likely a pun on the tire manufacturer Uniroyal.