There are three kaiju that appear in an official Kaiju Combat poster (to the right) are apparently Sunstone Games' mascots. Their names, however, have not been revealed.
Each kaiju has a fairly detailed design. The one at the top left of the poster appears to be a slim, long-necked dragon with a green-like skin color. The one to the right appears to be a three-headed dragon with a turtle shell with exagerate scutes. The last one is a blue quadrupedal ice creature.