but she is later revealed to be the terrifying Control Devil, a member of the Four Horsemen who embodies humanity's fear of conquest and domination. She appears as an attractive, slender human woman in her twenties with long, pale auburn hair tied in a loose braid and striking yellow eyes featuring multiple concentric red rings—the only physical hint of her inhuman nature. Her deceptive appearance perfectly complements her dual personality: on the surface, she acts as a gentle, polite, and deeply empathetic mentor, but underneath this facade lies a highly cold, Machiavellian, and ruthless mastermind who views all humans as "dogs" to be manipulated for her ultimate goal of controlling the Chainsaw Devil. To achieve this, she utilizes an overwhelming array of supernatural abilities, most notably her core power to brainwash and command any being she deems inferior to herself. Additionally, she can project an invisible, crushing kinetic force by pointing her finger, borrow the hearing and sight of lesser animals for global surveillance, and exploit a contract with the Japanese Prime Minister that transfers any damage or death inflicted upon her into the illnesses and casual deaths of random citizens, making her nearly impossible to kill.

is a member of the powerful Four Horsemen who takes the form of a high school student with neck-length, muted pinkish hair, several facial moles, and the signature piercing, multiple-ringed eyes of her brethren. Her distinct accessories include a black Devil Hunter Club cap and unique green earrings, two of which are long and taper into triangles to resemble a set of weighing scales. Driven by the fear of starvation, her terrifying abilities allow her to summon and control other Devils, turn starving or desperate individuals into her pawns, and even teleport, absorb lifespans, or heal mortal wounds by consuming life force. Behind her perpetually cold, detached, and unflappable personality lies a master manipulator who views people as mere tools, calculatingly orchestrating massive disasters and leading the Chainsaw Man Church from the shadows to achieve her hidden agendas. Kind.

possesses a unique appearance after taking over half of high schooler Asa Mitaka's brain: she manifests with distinct, prominent facial scars, sharp ringed yellow eyes, and an unkempt hairstyle, exuding a rigid and confident posture compared to Asa's timid demeanor. Her primary ability is Weapon Transmutation, which allows her to transform anything or anyone she subjectively "owns"—including objects, body parts, or people—into highly lethal weapons, with the weapon's destructive capability scaling exponentially based on the amount of genuine guilt or emotional value attached to the sacrifice. Driven by an intense desire for validation and revenge against Pochita, Yoru's personality is fierce, battle-hungry, and incredibly prideful; yet, despite her terrifying status as a physical manifestation of conflict, she remains surprisingly naive about human social norms, emotionally stunted, and deeply insecure about being looked down upon by her fellow Horsemen sisters. Talks foul.

the Death Devil (often called Morti or Death) appears as a young high school student wearing a Fourth East High uniform, a Devil Hunter Club cap, asymmetric triangular earrings resembling a scale, and her signature piercing, multiple-ringed pink eyes—though a vertical incision on her torso reveals she is technically a hollow corpse after a failed suicide attempt. As the most powerful of the Four Horsemen, her abilities stem from the primal and universal human fear of death, granting her massive reality-warping power, high-tier immortality, the ability to control or resurrect those she kills while severing them from their core conceptual power, and an immense knowledge of other dangerous devils. Her personality is calm, cold, and mysterious, yet surprisingly affectionate, as she demands to be called "Death(y)-chan". While she is highly intelligent and capable of perfectly reading others, she acts out of a bizarre sense of altruism; her ultimate plan is to stop the looming apocalypse by killing herself, perfectly willing to manipulate, underestimate, or betray allies like Public Safety to achieve her goals.