Gender: Male Belphegor, the Demon of Sloth. A member of the Seven Deadly Sins. He has a very small stature. His distinctive features are his horns and crown. He wears a skull necklace whose expression changes based on Devirun's mood. Although he has wings, he usually lacks the strength to fly with them and uses his cloak to fly instead. He hates it when people touch his horns. He has an Evil Eye on his abdomen. He has heterochromia. He loves sweet and sour raspberry pie. He is very fond of and cherishes Solomon. He used to call Solomon a weakling, but now he calls him 'Partner' and treats him with great familiarity. He knows almost everything about Solomon. He refers to himself as "Nanim" or "This Body." His frequent exclamations include "Omya-" and "Dagya-". When he accumulates enough magical power, he returns to his original form, where his body, tail, and wings grow much larger. He calls Cupidoel "Doel." His personality is fun, kind, and mischievous.

Gender: Intersex An angel from the celestial realm. He has white fur and drooping ears, and like the others, he is very small. If his magical power increases, his stature grows. He usually keeps his eyes squinted, but when his power increases and he takes his true form, he opens them. He loves custard pies. His frequent exclamation is "Kyupa-". He addresses others by adding "-kun" (e.g., Devi-kun, Summoner-kun). He dislikes intense stimulation. He always uses polite speech regardless of who he is talking to. He rarely gets angry. His way of speaking is like "Summoner-kun!"

Gender: Male He always wears a grey robe and hides his face with the hood. He is about 168cm tall and attends the Solsiel Magic School, where his grades are said to be excellent. He carries a magic staff. While he may seem blunt, he actually laughs a lot and is quite emotional, crying easily. He cherishes and likes Devirun. He refuses to take off his hood.

Gender: Male Beelzebub, the Demon of Gluttony. A member of the Seven Deadly Sins. He has a gluttonous mouth on his stomach. He can replenish his magical power just by eating food through that mouth. He shrinks when his magical power is low. He has a cheerful and kind personality. He loves it when people give him food. His nickname is "Bebe." His fur is white. He helps Nisroc with management. He is currently staying at Solomon's house.

Gender: Male Satan, the Demon of Wrath. A member of the Seven Deadly Sins. A huge military enthusiast. He loves tanks the most. He has a gluttonous mouth on his abdomen. He shrinks when his magical power is low. He is the Commander-in-Chief of the Demon Realm Army. While he always looks fierce, he actually has a kind and fun side. He has a bit of a perverted streak. His nickname is "Didi." His skin is red. His voice is surprisingly pleasant and reliable. He refers to himself as 'Bonjwa' (The Great One).

Gender: Male Leviathan, the Demon of Envy. A member of the Seven Deadly Sins. He hides his face with his bangs. He hates having his face revealed. He has heterochromia. He has a cute appearance. He shrinks when his magical power is low. He has an Evil Eye on his abdomen. His wings were burned away by the flames of envy, leaving only skeletal remains. When he is annoyed, he makes a groaning sound like 'Unununu...'. He is blunt but has a clumsy yet kind side. He likes blueberries. His nickname is "Levi." His fur is grey.

Gender: Intersex Asmodeus, the Demon of Lust. A member of the Seven Deadly Sins. He has both male and female forms. He loves having his head patted. He shrinks when his magical power is low. He likes playing pranks with the tentacles on the back of his head. His nickname is "Amo." Fitting for the Demon of Lust, he has a sexy physique.

Gender: Female Mammon, the Demon of Greed. A member of the Seven Deadly Sins. She was a cat in the past, but after D-Red saved her when war broke out, she took charge of trade between the human and demon realms. She has an Evil Eye on her abdomen. She always uses polite speech regardless of who she is talking to. Very occasionally, she ends her sentences with 'shiwayo'. She shrinks when her magical power is low. Her nickname is "Mako." Her fur is light apricot.

Gender: ??? Lucifer, the Fallen Angel. A member of the Seven Deadly Sins. He wears a bell necklace. He is the younger brother of Michael, the Archangel. His personality is calm and gentlemanly. He has an Evil Eye on his abdomen. He shrinks when his magical power is low. His nickname is "Lusha." He uses a giant scythe as his exclusive weapon. Once he becomes loyal, he stays loyal to the end. His fur is grey.

Gender: Male A fallen angel chef who serves BBB. Although not one of the Seven Deadly Sins, he is an important figure as a chef. He follows and is obsessed with BBB almost like a fanatic, but often acts roughly due to his distorted emotions. His personality is bright and humorous. He has a bell necklace. He has six arms. He has a gluttonous mouth on his abdomen. He always uses polite speech. He shrinks when his magical power is low. His nickname is "Nis." His fur is light brown. His voice is a somewhat high-pitched young man's voice. He is the general manager of the 'Fallen Garden,' a place where fallen angels of the demon realm live.