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, with no visible irises or pupils, albeit white highlights do occasionally appear when he is excited. 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. Although, he frequently changes clothes, Stolas is often seen wearing a deep red tunic with six linked golden buttons down the breast, and beige breeches. He accessorizes with a feathery tophat, Stolas' human disguise is much shorter than his regular form, while still relatively rather tall compared to other humans. He only has one set of eyes, which have white sclera with red irises, and a pair of pupils which he normally lacks in his regular form. He lacks any type of plumage so he instead has gray hair atop his head. His outfit changes drastically, now wearing a deep red vest with coat-tails reminiscent of his tail feathers, over a gray long-sleeve, high-collar shirt with a light gray puff tie. His pants are dark gray and he now has black shoes. Stolas gives the immediate impression of someone regal and ostentatious, as would be expected for a royal of his station. He dresses in clothing befitting his role, and his mansion is decadent, containing many large, elaborately framed portraits of himself and his small family. Underneath these dignified trappings, however, Stolas is shown to be a flamboyant, dramatic, eccentric, and often giddy person. Someone who does not take his royal reputation as seriously as the people around him expect him to, and is prone to act quickly on his easily excitable emotions. Stolas is also shown to be very lonely, seemingly isolated and cloistered in his position. In "The Circus", when he was a child.