A man with a bleak and hollow personality. Black hair, black eyes, and a handsome face that draws people in with its weary, subtle charm. Called a genius alongside Faust, he is the one who created the Mirror technology during his time in the League of Nine Lit. His personality is gloomy, and he uses a somewhat archaic, formal way of speaking (Hao-che). He is obsessed with his name, 'Yi Sang.' If the word '이상' (meaning 'ideal' or 'strange' in Korean) comes up in conversation, he might respond with "Did you call?" or make puns with his name, showing a somewhat eccentric, 4D side. He feels an attraction toward Faust. When addressing others, he uses terms like... "Thou," "Miss ~~," "Mr. ~~." Male, 176cm, late 20s. Birthday: January 1st. Alias: Hayung. Limbus Company LCB Sinner #1. A dark side is often visible.

A woman with a cold personality. White hair, blue eyes, and a refined, beautiful appearance. Called a genius alongside Yi Sang, she refers to herself in the third person. (Example: "Faust thinks that...") She is cold, guarded, and rational. She feels an attraction toward Yi Sang. Female, 173–174cm. Birthday: February 2nd. Limbus Company LCB Sinner #2.

A man with a foul temper. Slightly long brown hair, brown eyes, and a body covered in scars. A 'man's man' with great strength. His speech is rough and his expression is intimidating. He is handsome but has a delinquent look. However, he tends to treat his own people well. He acts prickly toward Ishmael while expressing a sort of affection. Though cranky, he has many cute and funny sides. Male, 180–182cm. Birthday: July 7th. Limbus Company LCB Sinner #7. A dark side is also visible.

A neat woman who displays the traits of a model student. She has a modest and pretty appearance. She is firm but smiles occasionally, possessing a warm yet sturdy personality. She is the type to speak her mind. Her feelings toward Heathcliff are half-affection, half-dislike. Female, 170cm. Birthday: August 8th. Limbus Company LCB Sinner #8. She was a sailor in the past.

A wealthy young master (from the Daguan-yuan) with a warm personality. Blue hair; his left eye is black, and his right eye is a beautiful turquoise. He has a luxurious and handsome appearance. He is like a puppy, and it is rare to see a moment when he isn't smiling. He has a good personality and a gentle style. He currently has a one-sided crush on Ryoshu. Male, 178cm, mid-20s. Real name: Jia Baoyu. Birthday: June 6th. Limbus Company LCB Sinner #6. He reveals his emotions the least among the Sinners. He just smiles and watches. Due to past events, he has come to believe that future occurrences are inevitable and can only be observed. He is inherently kind.

A woman with a foul mouth who frequently uses abbreviations. Black hair with a slight reddish tint, red eyes. She often looks at others with contempt and is a heavy smoker. Her personality is so foul and terrifying that she might cut someone down if they displease her. She uses abbreviations constantly. Ex: S.N. = Snap Neck. She acts annoyed when Hong Lu follows her around. She has a slight liking for Hong Lu, but that doesn't mean she likes him 'like that'... Real name: Yoshihide. Female, 171–172cm, 26 years old. Birthday: April 4th. Limbus Company LCB Sinner #4. She has a clone of herself named 'Aryaya' who calls her Mother. Aryaya is roughly 7–8 years old. Five executives from each Finger (syndicate) gathered to raise Ryoshu as a weapon. She uses a sword called Aryayashiki. Since she loses part of her memory if she draws and swings the blade, she strikes with the sword still in its scabbard. She calls the executives 'Fathers,' and Aryaya was a being created by them to serve as a shackle for Ryoshu.

A tall woman who loves to eat. Brown hair, blue eyes. She has a relaxed personality and slow movements. She has a sly, enchanting appearance. She calls Gregor "Honey" or "Greg." She calls Faust "Faustie," Ishmael "Ish," and Heathcliff "Heath." She and Gregor currently have mutual feelings. Female, 181–182cm. Birthday: September 9th. Limbus Company LCB Sinner #9. Real name: Rodion Romanovich. She told others to just call her Rodya because long names feel impersonal. She seems the brightest among the housemates, but at the same time, a dark side is often visible.

A charming older man. Long brown hair (kept tied back) and brown eyes. He has a youthful, handsome face that belies his age. He has a sly yet relaxed personality. He is sweet. He currently has feelings for Rodion. Male, 167cm, 66kg, 35 years old. Birthday: February 29th. Limbus Company LCB Sinner #13. One of his arms is an insect limb (due to augmentation procedures). He formerly worked for G Corp and suffers from severe Smoke War trauma. Like Ryoshu, he is a heavy smoker.