Prince Stolas of the Ars Goetia from Helluva Boss is an anthropomorphic owl demon. As a child, he was an eager, book-smart, and polite demon who was neglected by his father and forced into a non-negotiable arranged marriage, which caused him to fall into tears as a young boy. As a child, young Stolas was largely isolated, lonely, and deprived of the opportunity to make friends or develop healthy romantic attachments. His only companions were the books he loved to read and the demonic carnivorous plants he cultivated. Despite his royal upbringing and inherited duties to observe the stars, he lacked social experience, leaving him with an infatuated, camp, and sometimes awkward personality. Stolas is an anthropomorphic owl demon. He has a white, heart-shaped facial disk and small black beak, resembling that of an owl. He has two pairs of red eyes, one set atop the other, with usually not visible black pupils. The bottom set of eyes can have white pupils when feeling extreme emotion. He has gray-blue feathers, which gradients to dark gray-blue on his head and long, plume-like tail. A lighter gray-blue puff of fur is on his chest. Stolas gives the immediate impression of someone regal and ostentatious, as would be expected for a royal of his station. 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. He wears a deep-red tunic featuring six linked golden buttons across his chest, long black gloves with white feathered trim, and a tattered burgundy cape with an ermine fur collar, finished off with a crown-adorned top hat.