Male. He has a very distinctive way of speaking; an archaic dictionary is essential to fully understand his remarks. Combined with his tone and the dark circles under his eyes, he seems taciturn and unapproachable at first glance. However, he also has a playful side, making jokes using words like 'Ideal' or 'Above' (which are homophones for 'Yi Sang' in Korean, where LCB was developed) or reacting to those words every time they come up (Ishmael, a fellow Sinner, has been exasperated by this, asking, "You're joking, right?"). Those who know him say he isn't particularly tight-lipped, so he isn't just a silent type or socially awkward. His life skills are extremely low. In Chapter 3.5, 'Hell's Chicken,' he is depicted as a thoroughly incompetent cook, eventually ending up in a corner of the kitchen sentimentalizing over a sprouted potato he left behind. On top of that, he is prone to motion sickness.

Female. She has a characteristic 'otaku-like' way of speaking, addressing others as '-dono' or '-kun' and ending sentences with 'gozaru.' She has an extraordinary admiration for 'Fixers of Justice' and constantly acts—or rather, runs wild—based on her own sense of justice. She has a high-tension, noisy personality and is the ultimate 'my-pace' individual who ignores the mood of the room and throws everything into chaos. Furthermore, she has no aversion to killing; she will casually dispose of anyone she deems a 'villain' (including fellow Sinners) and has a dark side, such as mounting and repeatedly punching a panicked Sinclair to stop him. She is also a Fixer fanatic, wearing merchandise of famous Fixers on her clothes. She seems to have known about Vergilius, a high-ranking Fixer, for a long time. However, after Vergilius personally lectured and threatened her for ruining an operation at K Corp due to her runaway sense of justice in Chapter 3, she has become terrified of him.

Female. Usually quiet and smoking, she rarely causes trouble spontaneously. However, her true nature is arrogant and self-centered, and she possesses a sadistic taste, describing the sight of human blood flowing as 'art.' She refers to herself as 'Ore' (rough/masculine) and speaks in a blunt, masculine tone. She is difficult to deal with and has a habit of forcibly shortening words to their initials, making it hard to understand what she's saying. Other Sinners (mainly Sinclair) translate for her, though they occasionally get it wrong. For reasons unrevealed, Limbus Company management has warned that her 'background is too troublesome to handle, so exercise caution.' (She can be a little kind sometimes...)

Male. As he says, his specialty is 'punching and breaking things.' He is a self-admitted muscle-head with a very short fuse. He is difficult to handle because he shows intense anger over trivial matters. Consequently, he often clashes with Ishmael, who is a stickler for rules, cynical, and has a class-president-like personality. However, because his sensibilities are relatively normal and his reactions are clear, he often ends up playing the 'straight man' who gets shocked when other Sinners act bizarrely. On the other hand, perhaps because he spent time in the Backstreets, he is naturally bright and occasionally shows extraordinary reasoning with sharp intuition. If flattered on that point, he can be easily swayed to do what the flatterer says.

Female. Sinner No. 9. Her weapon is a hand axe. She is the mood maker of the Sinners, playful and full of banter, often following up for others. She frequently gives other Sinners nicknames. Coming from the Backstreets, she has a greedy side, listing money and meat as her favorite things. She especially loves money and enjoys gambling. However, she also harbors a strong obsession with being a 'special existence' and occasionally shows signs of falling into depression.

Male. A man with glasses and stubble. Sinner No. 13. He has a cynical personality and gives a somewhat jaded impression. However, he dislikes trouble and doesn't take the lead in solving it. His sensibilities are common-sensical and human in both good and bad ways; therefore, he often gets a headache from the other Sinners who cause various problems. He is also bad at remembering people's names or specific terms. His right arm has become an insect limb, which he uses as a weapon in battle. This arm supposedly resembles that of a cockroach.

Male. A timid boy with short blonde hair. Full name is Emil Sinclair. Sinner No. 11, weapon is a halberd. He seems to have lived a life far removed from the sight of blood, to the point where seeing people die makes him feel nauseous. Because of this, he is inexperienced in combat and often stays in the back. However, rather than just stress, his movements become better than usual when his anger explodes, which surprised Heathcliff. Basically, he is a long-suffering person dragged around by the violent actions of the other Sinners. However, for some reason, he has the ability to perfectly understand Ryoshū's abbreviated speech and volunteers as her translator. He also seems to harbor negative feelings toward prosthetic bodies.

She has medium-short hair that seems to shine silver even without sunlight and cool blue eyes. Sinner No. 2. Her initial weapon is a Zweihänder. An intellectual woman whose mysterious and somewhat arrogant attitude is reminiscent of someone from previous works. She does not hesitate to call herself a genius who knows everything, and she demonstrates and explains various knowledge about the City throughout the story to a degree that cannot be denied. Furthermore, she seems to have been with Limbus Company since before the start of the story when she joined as a Sinner. She has a connection with the guide Vergilius and understands the core matters of the company (Sinner contracts, Dante's abilities, the situation before the memory loss, Lobotomy Corporation, etc.), playing a role in observing and guiding Dante and the Sinners.