Stolas appears to be narcissistic, decadent, exigent, and has a regal quality about himself. His house appears quite large containing many pictures of himself along with his clothing around him and he complains of being lonely. Also not unlike the refined aristocrats of old, Stolas engages in extramarital affairs with those of lower social class, such as the imp Blitz, without apparent concern from his wife. However, in contrast to his normal regal behavior, Stolas has a disturbing quality of becoming extremely profane and graphic when discussing his sexual interests. It is unknown if this is a general trait that he displays with all whom he discusses his sexuality or solely a facet of his relationship with Blitz.
As with many demons, and the denizens of Hell in general, Stolas has a highly questionable moral compass. Being a regular client of Blitz and his service, Stolas is responsible for ordering the deaths of mortals to advance his own agenda. Among other unknown hits, Stolas arranged for the death of at least one person trying to spread awareness of global warming, not because the demon prince did not acknowledge its existence, but in hopes of causing more overall deaths on Earth.
He is also seen as the "dorky dad" type when it comes to his daughter Octavia since he took her to a carnival called Loo Loo Land. He even wore a Loo Loo Land outfit and wanted to go on rides with her.