Who Was the First Demon in Demon Slayer?

by Hazel

“Demon Slayer: Kimetsu no Yaiba,” created by Koyoharu Gotouge, has captivated audiences with its rich lore, compelling characters, and intense battles against demons. Central to the series is the origin and nature of demons, particularly the question of who was the first demon. This article delves into the intricate world of “Demon Slayer” to uncover the origins, myths, and significance of the first demon.

Demons in “Demon Slayer”

Overview of Demons

In the world of “Demon Slayer,” demons are malevolent beings born from humans who have been corrupted by Muzan Kibutsuji, the primary antagonist of the series. These creatures possess immense strength, regeneration abilities, and unique supernatural powers derived from their cursed blood. As adversaries of the Demon Slayer Corps, demons are formidable opponents that challenge the protagonist, Tanjiro Kamado, and his allies.


Origins and Transformation

Demons are created through a process known as “Muzan’s Blood Demon Art,” where a human is injected with Muzan’s blood. This transformation grants the human enhanced physical abilities, immortality, and supernatural powers, but at the cost of their humanity. Once turned into a demon, an individual’s memories and personality are often warped, leaving behind a creature driven by insatiable hunger for human flesh and blood.


The Quest for Immortality: Muzan Kibutsuji

Introduction to Muzan Kibutsuji

Muzan Kibutsuji is the progenitor of demons in “Demon Slayer.” Born as a human centuries ago, Muzan sought immortality and power through dark rituals and alchemy. His relentless pursuit of eternal life led him to discover a cursed medicine that transformed him into the first demon, imbuing him with unparalleled strength and longevity.


Transformation into the First Demon

Muzan’s transformation into a demon marked a turning point in the series’ mythology. His newfound powers and immortality enabled him to create and control other demons by passing on his blood, thus perpetuating his legacy and expanding his influence. Muzan’s curse is both a blessing and a curse, granting him unparalleled power while condemning him to a life of perpetual loneliness and paranoia.


The Myth of the First Demon

Legends and Lore

In “Demon Slayer,” the concept of the first demon is shrouded in myth and mystery. According to legend, Muzan Kibutsuji is considered the first demon due to his role as the progenitor and creator of all other demons. His dark transformation and subsequent reign of terror solidify his status as the originator of demonic existence within the series’ universe.

Historical Context

Throughout history, myths and folklore have depicted demons as malevolent entities that embody evil and chaos. In various cultures, the first demon is often portrayed as a fallen angel, a corrupted deity, or a vengeful spirit. These narratives explore themes of temptation, moral decay, and the consequences of seeking forbidden knowledge or power.


Muzan’s Legacy and Influence

Creating Demons

Muzan’s ability to create demons through his bloodline is a central plot device in “Demon Slayer.” By injecting humans with his cursed blood, Muzan transforms them into powerful creatures bound by their insatiable hunger for human flesh. Each demon inherits unique abilities and traits, reflecting their individual histories and desires prior to transformation.

Demon Hierarchy

Within the hierarchy of demons, Muzan occupies the highest echelon as the progenitor and undisputed leader. His commands are absolute, and disobedience is met with swift and merciless punishment. Muzan’s authority over demons extends beyond physical dominance; his manipulative cunning and strategic prowess make him a formidable adversary for the Demon Slayer Corps.

The Evolution of Demons in “Demon Slayer”

Demon Varieties

Throughout “Demon Slayer,” demons exhibit a wide range of abilities and appearances, each reflecting the circumstances of their transformation and their former human lives. Some demons retain fragments of their memories and personalities, while others succumb entirely to their primal instincts and bloodlust.

Sunlight Weakness

A defining characteristic of demons in “Demon Slayer” is their vulnerability to sunlight. Sunlight exposure instantly incinerates their bodies, making daylight a potent weapon against them. This weakness underscores the tragic nature of their existence, as demons are condemned to eternal darkness and isolation to avoid annihilation.

The Dichotomy of Demons and Humans

Humanity Lost

Once transformed into demons, individuals lose their humanity and are consumed by a relentless craving for human flesh. This loss of identity and moral compass serves as a poignant reminder of the tragic consequences of Muzan’s curse. The Demon Slayer Corps, comprised of skilled swordsmen and women, dedicate their lives to protecting humanity from the demonic threat.

Redemption and Tragedy

Despite their monstrous nature, “Demon Slayer” explores themes of redemption and tragedy among demons. Some characters, such as Nezuko Kamado, Tanjiro’s sister, defy their instincts and retain a sense of humanity through sheer willpower and love for their loved ones. These moments of redemption challenge perceptions of good and evil, highlighting the complexities of the human-demon dynamic.

The Legacy of Muzan and the Future of “Demon Slayer”

Finality and Resolution

As “Demon Slayer” approaches its conclusion, the mystery of the first demon, Muzan Kibutsuji, looms large over the narrative. Tanjiro Kamado and the Demon Slayer Corps continue their relentless pursuit of Muzan, seeking to end his reign of terror once and for all. The outcome of their struggle will determine the fate of humanity and demons alike.

Impact on Pop Culture

“Demon Slayer: Kimetsu no Yaiba” has achieved widespread acclaim and popularity, captivating audiences with its dynamic characters, stunning animation, and compelling storytelling. The series’ exploration of themes such as sacrifice, redemption, and the nature of evil resonates with viewers of all ages, cementing its status as a modern classic in the realm of anime and manga.


In “Demon Slayer: Kimetsu no Yaiba,” Muzan Kibutsuji stands as the first demon, both in myth and reality within the series’ universe. His transformation into a demon centuries ago marked the beginning of a dark legacy that continues to haunt humanity. Through his cursed bloodline, Muzan created a legion of demons driven by insatiable hunger and supernatural powers, posing a formidable threat to the world.

As the series progresses, the quest to defeat Muzan and unravel the mysteries of demons drives the narrative forward, exploring themes of courage, sacrifice, and the resilience of the human spirit. “Demon Slayer” invites audiences to delve into a world where the line between good and evil is blurred, and where the legacy of the first demon continues to shape the destiny of all who encounter it.


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