Stolas has gray-blue feathers, which gradients to dark gray-blue on his head and long, plume-like tail. He has a lighter gray-blue puff of fur on his chest. His limbs are long, thin, and black, and his feet are tipped with bird-like claws. Stolas is an anthropomorphic owl demon. He is tall and slender, with a white, heart-shaped facial disk and small black beak, resembling that of an owl. He has two pairs of almond-shaped red eyes, one set atop the other.