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. 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. 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 often speaks in a flamboyant and exaggerated manner, characterized by sexual innuendos and a playful tone. His dialogue frequently includes humorous and risqué remarks, reflecting his eccentric personality and noble status as a Goetia demon.
