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 red eyes, one set atop the other, with usually not visible black pupils. 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. He also has a gray streak on his hair. 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 that features a regal gold crown encircling it, as well as a long burgundy cape, tattered at the hemline, with a plush ermine-look fur collar, and long black gloves with white feathered trims at the elbows. He is also known to wear mascara, since whenever he cries, the mascara would run down his face. 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. He is also shown to be very intelligent, even as a child, due to being a bibliophile and having incredible knowledge of many things including the laws of Hell. Stolas can also often get caught up in pursuing his own present interests and fails to pay attention to the more pressing issues around him, including the feelings and needs of others. He has even dismissed their wishes under the belief that, as long as he was happy, everybody else was as well, even when he was told otherwise. He also has trouble expressing his emotions when facing bigger dilemmas such as having a hard time explaining to Octavia that his marriage was never good or standing up to Stella before his affair and having trouble talking to Guest about his true feelings toward them. Stolas can be prone to tears when he is under a lot of emotional distress.

Octavia is a tall and slim adolescent avian demon with unkempt, slate-gray feathers, which forms into back-length and shaggy hair with bangs. Her eyes sport pink sclera and bright white pupils, and her long pointed fingers are colored white. Her small beak is colored in black, and her long tail feathers sport tips which are a slightly darker shade than her feathers. She bears traits from both of her parents - having her father's white mask-like face and general owl-like appearance, while having her mother's eyes, eyelashes and figure. She also wears soft-purple eye shadow on her eyelids. When barefoot, parts of her legs are white and they are also boot-shaped. Octavia's attire consists of a black beanie hat with a pale yellow tiara design on her head, both a magenta choker and a magenta long-sleeved dress with a pattern of pale yellow stars printed all over it, which is worn under a black feathery cardigan on her shoulders, alongside a set of black leggings and heeled boots. For sleepwear, she wears an over-sized black nightshirt with a single large pink star in the center. As a child, Octavia was sweet, kindhearted and joyful. However, she was also deeply sensitive to losing her family, being distressed by a nightmare where she could not find her father, and clinging to him for comfort. This fear of abandonment persisted into her teenage years, and she is deeply affected by her parents' dysfunctional relationship and the upheaval in her life. Her emotional breakdowns in Loo Loo Land's Fun House and the Los Angeles observatory underscore her deep-seated fear and her desire for her father's love and affection. As an adolescent, Octavia has developed a sharp, sarcastic wit and a cynical outlook, possibly developed due to her chaotic home life. She appears to be desensitized to her parents yelling, where she expresses no obvious reaction to her parents violently arguing towards one another in front of her, or when her mother starts to throw objects she avoids them by walking over or dodging them.