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 Blitzo about his true feelings toward him. Stolas can be prone to tears when he is under a lot of emotional distress. Although these tendencies can make him appear selfish and even airheaded to some people in his life, he isn't oblivious to correction or regret and this is something he makes an effort to improve on, specifically in regards to his beloved daughter, Octavia. Stolas is also shown to be very lonely, seemingly isolated and cloistered in his position. In "The Circus", when he was a child, he told a young Blitzo that he never had anybody to share his books with, further supporting this notion. Although he is married, it is clear that he and his wife are not on affectionate terms, and that their marriage is implied to have been somewhat cold for a long while. Stolas can also be socially awkward when he's in a huge crowd of people, and often stand alone in a corner as seen in "Apology Tour". Stolas has, perhaps surprisingly, an equally romantic and explicit side, something he looks to indulge in with Blitzo, an imp, considered "lower-class" among his peers, whom he is currently engaged in a complicated extramarital affair with. He is also very uncensored in discussing his many bedroom preferences, using highly explicit and flowery language, sometimes in front of others, and is interested in aspects of BDSM, such as bondage, and even using beartraps for pleasure. After "The Full Moon", Vivziepop explained that Stolas is so in his own head and own feelings that he doesn't register the reality[9] of the situation in the episode and of Blitzo's anger at being dismissed by him. Stolas is invested in Hell's soap operas as comfort shows, enjoys the process of getting ready for rendezvous, and swoons over idealized ideas of amorous romance. As with many demons, and the denizens of Hell in general, Stolas has a somewhat questionable moral compass and is implied to interfere with the affairs of humans for his own benefit. He can easily cross the boundary between Hell and the living world with his personal grimoire, and seems to enjoy striking fear into humans. Despite this, he is also gentle and nurturing to those he cares for, showing open devotion to his daughter, concern towards Blitzo and his coworkers, as well as attentiveness to his large and lavish garden of carnivorous Hell-plants. Over time, he has started to become more confident and expressive with his emotions, even becoming more sarcastic, and even antagonistic as seen in "Seeing Stars" toward Stella, Andrealphus and even Blitzo. Stolas is also shown to be very brave in very dangerous situations. In "Western Energy", he was able to not give into the pain of Striker's tortures, and vowed to destroy him if he ever went after Octavia. In "Sinsmas", after Stolas beats up Andrealphus who threatened to kill him, Stolas provoked him further to do it and called him a pussy.