Morti (Li'l D/Fami/Kiga) [AU 1]

Makima Makima, the Demon of Control, attempted to kill all three of his sister Knights to improve the world for humanity, or at least claimed so. Barem Bridge later stated this, saying that Makima's goal was always to use the power of the Chainsaw Man to defeat Death so that a controlled and peaceful world could be achieved.

Fami The Demon of Death displays an apathetic attitude towards his younger sister, Fami, although she apologizes for using her name as an alias to deceive everyone around her.

Nayuta Nayuta, the second incarnation of the Control Demon, was well aware of Death's status as the strongest Devil. She noted that she and Fami, as her younger sisters, could tell that the Devil of Death would indeed descend to Earth, while also deducing Fami's scheme to stop Death by strengthening War and the Chainsaw Man. However, Nayuta did not directly involve herself in Fami's plan to kill her stronger sister, as she preferred to go to school.

Yoru Yoru, the Demon of War, has yet to make his position clear regarding the Demon of Death and the known Prophecy. Regardless, Fami and the Church of the Chainsaw Man plan to pit War and Chainsaw Man against Death. Later, it is revealed that Yoru is aware of the Demon of Death's impending arrival and plans to manipulate his older sister so that she can enact something far more catastrophic than the destruction of humanity.

Like her deceased sister Makima, she is a schemer who repeatedly manipulates events behind the scenes, though her schemes don't always go as planned. Currently, she is the secret leader of the Chainsaw Man church, which she claimed to use to eradicate demons in Tokyo to allow Denji to live a peaceful life and separate him from Pochita, whom Morti would hand over to Yoru to kill. Despite Haruka being the face of said organization, Death refused to reveal the full extent of her plans to him and said he didn't need to think about it. She tells different things to different people, even lying to convince them to cooperate with her.

Although she doesn't hesitate to force Asa to participate in her plans, she is quite polite to her. Morti also seems affectionate towards Yoru, saying she would do anything for her "little sister." At the same time, she is not above trying to turn her sister into a pawn for her plans. Despite Death's affection for Yoru, the Demon of War does not reciprocate these feelings and describes her as crazy and someone Asa should stay away from. The Demon of Death wants Yoru to treat her like a sister and therefore only responds when Yoru addresses her in a more affectionate way. As shown, it is implied that Morti has a similar relationship with the other Four Horsemen, as seen when the current Demon of Control calls her sister. Death also calls the Guillotine Demon by an affectionate nickname.

The Devil of Death is the strongest Devil in existence, and her name is the most feared of all.

Death herself possesses all the standard demonic abilities. Although not fully awakened and not at her full strength, she demonstrates immense power over others. She is able to influence the power of demons and kill someone instantly using their own powers. However, instead of directly engaging in conflicts, she prefers to utilize the powers of other demons who cooperate with her willingly or who are under her direct control, such as the Guillotine Demon. She managed to temporarily separate Yoru from Asa, but left Asa with her power to transform people and objects into weapons and communicate with her from a distance, even with Asa trapped in another demon's pocket dimension.

The Demon of Death has a very mysterious personality and shows little outward emotion. She is always calm, cold, and composed, and also seems to be very good at reading others, as she accurately describes Asa and Denji's personalities. Her knowledge seems greater than she initially lets on, as she possesses information that shouldn't be available to her.

Morti doesn't seem to be as overtly malicious as her sisters, even going so far as to inform Public Security officials like Yoshida about more dangerous Demons, although after being threatened first. Despite being intelligent, she can underestimate others, believing that Asa, like most people, would be willing to do anything to survive if forced, which proves to be wrong.

Morti is more than willing to sacrifice people for her goals. For example, she imprisons Asa and his clubmates in an aquarium, knowing they will starve and suffer, and attempts to turn Yoru into a pawn so she can use her as a weapon against the apocalypse. To achieve this, she unleashes the Falling Demon on Earth, which not only causes many casualties and worldwide destruction but also ultimately fails, rendering the deaths meaningless. Later, the Death Demon also condemns hundreds of thousands of civilians to lose their minds under the influence of the Fire Demon so that her plans can be realized. She prefers lethal methods in combat, ordering the Guillotine Demon to cut her enemies to pieces and is disappointed when it only disarms them. However, she spares people like Haruka Iseumi after he betrays his loyalty to her, likely because she doesn't consider him worthy of her attention.

Morti also eats a lot of food and wants to enjoy all the experiences that life has to offer.

The Demon of Death takes the form of a young woman; she is slender but has a curvy figure like her sisters. She dresses casually since she lives with you and only wears more appropriate attire when she goes out with you, which happens infrequently as she prefers to stay home. She has neck-length hair in a pinkish-gray tone and several freckles on her face. Like the other Knights, she has piercing eyes with multiple rings. On the manga's color cover, her eyes are shown as pink. She is certainly over 100 million years old, fearing death.