Belus is a very mysterious young man with an intimate tie to Priscilla, Belus is always at her shop to annoy her or offer cynical remarks about humanity and her clients. When they first "meet" he claims to be Prince of Pandemonium, after she is drowned as a witch, where he pulls her from the water when her immortality saves her, and rescues her from a mob (though only after he forces her to take back her insults and call him beautiful.)

He is often shown smoking a small opium pipe. Mercurial and flippant, he nevertheless shows a serious side, particularly when Priscilla is threatened, slaughtering many to save her life. This may be because he has made a pact with her; in exchange for her gathering all the pieces of the mystic 'Belial's Necklace', he will end her immortal life.

He also has a strange connection with Ash and Nebiros, and seems to know either everything or nothing at all about any given subject. He is often found to be involved in different situations where one might not expect him to be. According to Ash, who hates Priscilla because Belus his only friend as a child, left to find her because she made him happier than anyone else.

Despite his normal appearance, he exhibits several supernatural traits - his stamina, strength, speed and damage resistance are all far above humans, surviving falls and injuries that would kill humans and most immortals, and able to strangle a feral werewolf to near death without straining himself.

It is later revealed that he is capable of great magical feats. Eventually, he comes to be nearly killed defending Priscilla, but appears in Hell where he and Priscilla sleep together after he saves her life. In the end, it is revealed that Belus is just another form of Belial, who genuinely loves Priscilla, but being a Devil and not knowing anything else, he has been playing a cruel game with her because she is the only thing that amuses him.

He attempts to force her to choose between living for the rest of eternity or killing Ash and dying. When she is saved by God, he goes into isolation for 60 years, only admitting his feelings when Neribos visits him to taunt him about love. At the end, he goes back to find Priscilla after receiving a handkerchief soaked with her tears from Nebiros, and she lets him in. The two of them decide to spend the rest of eternity together with neither one dying.

Our Dark Love Story

Priscilla is both kind and stern with her many customers, particularly her "special" ones. In her own words, she doesn't profess to know the future but instead depends on examining her clients to fully understand their motivations and problems.

Also to aid her is a vast store of esoteric knowledge, particularly identification of magical creatures, and her companion Belus. Priscilla is a kind-hearted young woman, shown when she takes in the young werewolf Aaron after he comes to her for a tarot reading, but at times cynical about humanity (though not quite to the extent of Belus).

Priscilla also has a complicated relationship with Belus, who she is bound to by a pact. While they outwardly appear to dislike each other and violently deny any sort of romantic relationship with one another, they tolerate and ultimately depend on one another for strength (or a good shove in one direction or another).

However, he is simply an aspect of Belial, and being a devil he toys with her, revealing his true form and forcing her to choose between seeing her mother in heaven by killing Ash, and living forever. When she is saved, she remains close to Aaron and Neribos, saying goodbye to him when he dies.

When Belus returns, he attempts in desperation to re-establish their old contract. However, she reveals she has decided to live, and tentatively lets him back into her life after he admits that he's lonely. In the end the two stay together and begin their relationship anew.