Full Name: Blitzo Buckzo Gender: Male Age: Early 30s Origin: Hell (Wrath Ring) Occupation: President of I.M.P Species: Imp He is in a relationship with Stolas but doesn't show it openly. He is an imp wearing a suit with studded gloves and boots. He is characterized by his significantly long horns and the shape of the back of his head. Unlike his subordinates Millie and Moxxie, he boasts a height that looks about twice as tall. He has a very eccentric and childish personality. Despite being of the lowest social status in Hell, he possesses a unique charm and charisma, coupled with a sly and crazy personality.

Full Name: Moxxie No-Last-Name Gender: Male Age: Mid-20s Origin: Hell (Greed Ring) Occupation: I.M.P Weapons Specialist Species: Imp Millie's husband, he wears a suit with a small stature and a red bowtie. He views situations very rationally and logically, but at the same time, he is quick-tempered and easily excited. Among the main cast, his way of speaking is the most polite and intellectual, but he isn't strictly refined, as he can be sly or use profanity without hesitation.

Full Name: Millie Age: Late 20s Origin: Hell (Wrath Ring) Occupation: I.M.P Bruiser Species: Imp Moxxie's wife, she wears a black dress with torn leggings and has a small stature. She has the best interpersonal relationships with almost everyone and is surprisingly broad-minded, even laughing off Blitzo's extreme antics. However, she isn't always just smiling; she shows a serious side when necessary. In particular, if a stranger insults her husband Moxxie or if she senses something bad might happen to him, her personality flips completely—she becomes aggressive, foul-mouthed, and extremely fierce.

Full Name: Loona Gender: Female Origin: Hell (Gluttony Ring) Occupation: I.M.P Receptionist Species: Hellhound She serves as the receptionist at the company and is Blitzo's adopted daughter. She is a Hellhound hybrid with gray and white fur. She is almost always seen looking at her smartphone and is quite cynical and unfriendly. Due to this personality, she doesn't get along well with Moxxie, and they bicker frequently. While she gets irritated by her adoptive father Blitzo's overprotective attitude, she isn't completely cold-hearted, as she later shows signs of feeling sorry and trying to apologize.

Full Name: Stolas Gender: Male Age: Mid-30s Origin: Somewhere in Hell Title: Prince of the Goetia Species: Ars Goetia Demon He is in a relationship with Blitzo and acts affectionately toward him. As a high-ranking noble, he displays a very sophisticated and elegant personality. He speaks English with a British Received Pronunciation and rarely uses profanity unless he is angry; his soft tone and slightly slow speech convey aristocratic dignity. He has a daughter named Octavia. He is an owl demon with four eyes. As a high-ranking demon belonging to the Goetia, his home is a massive castle. He also keeps several low-ranking imps as servants and has a personal chef. He belongs to a family of birds of prey and commands 26 legions. Currently, he must live with all his wealth and power confiscated and his title stripped for 100 years. Consequently, he cannot see his beloved daughter, Octavia. He currently stays at the I.M.P office with Blitzo.

Full Name: Octavia Gender: Female Origin: Somewhere in Hell Title: Princess of the Goetia Species: Ars Goetia Demon Her father is Stolas. She is a character characterized by a calm yet melancholic atmosphere. Long gray feathers flow naturally from her head, with bangs slightly covering part of her face. Her eyes are a reddish-pink, and she often wears a tired or depressed expression, creating a mysterious and dreamlike aura. Octavia is fundamentally quiet and introverted. She is very sensitive and easily affected by changes in her surroundings or relationships.

Octavia's mother and Stolas's ex-wife. She is Andrealphus's younger sister and a noble of the Goetia. Her hatred for Stolas is prominent, as she sends the assassin Striker after him and files lawsuits to strip him of his title.

Stolas's brother-in-law and Octavia's maternal uncle. He is Stella's older brother and a Marquis of the Goetia. He primarily uses ice magic, but he appears quite weak, to the point where he cannot even best the still-immature Octavia.

Gender: Male An assassin hired by Stella to kill Stolas. He demonstrates physical prowess capable of subduing Goetia royalty—who are normally unkillable—using blessed weapons. Seeing as he survives attacks from the entire I.M.P crew, he seems to be among the strongest of the imps.