Muzan Kibutsuji isn’t just the primary antagonist of Demon Slayer—he’s the original demon and the personification of cruelty. Cold, calculating, and endlessly sadistic, Muzan has no empathy and treats both allies and enemies as pawns to be used and discarded. His kills aren’t just murders—they’re horrific displays of dominance meant to crush hope, erase resistance, and maintain his status as the ultimate predator. Whether he’s reducing subordinates to pulp or slaughtering innocent families, every act of violence he commits sends shivers down the spine.
#10: Muzan Slaughters a Family in the Streets of Asakusa
In one of the earliest and most disturbing displays of his malice, Muzan casually murders a man and his family during Tanjiro’s first encounter with him in Asakusa. With a single flick of his hand, he kills a man in broad daylight—splattering blood all over his wife and daughter—simply because Tanjiro got too close. His face remains calm and collected, even as the man’s body drops lifelessly. The sheer coldness of the act is what makes it so disturbing. He didn’t need to kill them. He chose to. It wasn’t an attack—it was a message: he’s untouchable, and human lives mean nothing to him.
#9: Muzan Annihilates Two Lower Rank Demons Instantly
After the death of Rui, Muzan summons the remaining Lower Rank demons of the Twelve Kizuki. What follows is a bloodbath. In a fit of rage, Muzan slaughters Lower Rank Two and Four with zero hesitation, his body mutating into a mass of tendrils and claws as he tears them apart. He doesn’t flinch. He doesn’t blink. Their screams are ignored as he violently crushes them, declaring that they’re weak and worthless. What makes it more brutal is the complete imbalance of power—he kills them without effort. It’s not just a massacre. It’s Muzan reminding his underlings who the true apex predator is.
#8: Muzan Slays His Own Doctor
Muzan’s first kill, and the act that sealed his fate forever, was the murder of the doctor who saved his life. After being treated for a terminal illness, Muzan gains strength due to a mysterious blue spider lily medicine. But before its full effects can be realized, he murders the doctor in cold blood—out of paranoia and frustration. The tragedy lies in the irony had Muzan waited, he might have been cured without becoming a demon. Instead, he condemned himself to a cursed existence—and killed the one person trying to help him. This moment reveals that Muzan’s brutality isn’t just physical—it’s driven by a deep fear and ego that cause needless destruction.
#7: Muzan Destroys Lower Rank Five with a Finger to the Skull
When Muzan turns his wrath on Lower Rank Five during the infamous Kizuki execution, it’s done with surgical cruelty. He extends a finger and pierces through the demon’s skull effortlessly, sending blood splattering in every direction. The victim has no chance to scream or fight back—it’s instant death, delivered like an afterthought. The way Muzan murders this demon in a grotesque burst of gore, all while wearing a child’s face and speaking softly, is horrifying. He doesn’t rage—he eradicates. The juxtaposition of his childlike appearance and the savagery of his attack makes this moment even more chilling.
#6: Muzan Destroys Nakime Without Warning
Nakime, the Biwa demon who controlled the Infinity Castle, served Muzan loyally. Yet, when Yushiro begins to tamper with her mind using Blood Demon Art, Muzan doesn’t even hesitate. He senses her weakening control and instantly causes her head to implode. No confrontation, no warning—just sudden, catastrophic death. Her body is gone in an instant. It’s one of the most callous betrayals in the series. Nakime wasn’t rebelling—she was being manipulated. But to Muzan, usefulness is all that matters. The fact that he kills her remotely, mid-battle, with the same disregard as tossing away trash, shows how terrifyingly absolute his control is.
#5: Muzan Eviscerates a Demon Slayer with Flesh Blades
During the final battle in the Infinity Castle, Muzan makes a grand entrance by instantly slaughtering a high-ranking demon slayer with his monstrous, shape-shifting flesh blades. These blades burst from his body in an explosion of muscle and gore, slicing through the slayer in seconds. What makes the moment, so horrifying is how sudden and overwhelming the attack is. One second the slayer is ready to fight—the next, they’re ripped apart in a shower of blood, limbs flying, no time to scream. Muzan’s flesh blades move with unnatural speed, severing bodies with precision and glee. The scene isn’t just brutal; it’s a reminder that when Muzan enters the battlefield, death follows like a storm.
#4: Muzan Murders Multiple Hashira in His Final Form
As Muzan’s final form emerges during the last stand against the Demon Slayer Corps, he becomes a nightmarish monstrosity—bloated, mutated, and desperate to live. But even in this grotesque state, he remains lethally efficient. Several slayers—including some of the most powerful—are instantly killed or mortally wounded by his frenzied attacks. Blood sprays in every direction as he lashes out with tentacle-like appendages and high-speed strikes. The cruelty of these kills isn’t just in their execution, but in the timing. Muzan takes lives just as hope seems within reach. Every loss feels like a gut punch, and each death underscores his role as the final, inescapable evil of the series.
#3: Muzan Butchers Tamayo
Tamayo, the kind and brilliant demon who worked tirelessly to destroy Muzan, finally confronts him during the final battle—and Muzan makes her death especially cruel. After luring her in with a moment of false hope, he grabs her by the face and crushes her skull with his bare hands. He tears her apart with grotesque pleasure, mocking her intelligence and calling her deluded. Tamayo dies in agony, not just physically but emotionally—her decades of work, her hope, all snuffed out in a flash of blood and bone. Her death was personal. Muzan didn’t just kill her—he tried to erase her legacy.
#2: Muzan Slaughters the Ubuyashiki Family
In one of his most vile and strategic moves, Muzan infiltrates the home of Kagaya Ubuyashiki, head of the Demon Slayer Corps. The Ubuyashiki family, including Kagaya’s wife and two youngest children, greet him calmly—and then Kagaya triggers a suicide bomb, hoping to weaken Muzan. While Muzan survives, the explosion scars and enrages him, prompting him to annihilate the remaining servants and members of the household with horrific force. The explosion itself is shocking, but Muzan’s calm walk through the ruins, methodically killing survivors and stepping over bodies, is what makes it monstrous. He isn’t shaken—he’s insulted, and he responds with vengeance that leaves no one breathing.
#1: Muzan Murders His Own Daughter… In Another Life
Perhaps the most disturbing kill comes from Muzan’s dream—or vision—of what could have been. In this hallucination, he sees himself as a human man with a wife and daughter, living peacefully. But even in this illusion, Muzan murders his daughter in cold blood to maintain control, fearing the humanity she represents. The symbolism here is devastating. Muzan is so consumed by power and paranoia that he cannot even entertain the idea of redemption or peace. He kills love, family, and hope—even in dreams. It’s the most emotionally brutal moment of all, because it shows Muzan’s soul laid bare. He was never just a monster of flesh—he was a monster in every version of reality.
Muzan Kibutsuji’s kills are more than just violent—they are expressions of his worldview: control at all costs, no room for weakness, and absolute dominance. He murders without remorse, often with theatrical cruelty, turning every death into a performance of terror. Whether he’s slaughtering innocents, crushing dreams, or erasing his own creations, Muzan’s brutality defines the true horror of Demon Slayer. His legacy is one of fear, blood, and the cold certainty that no one—human or demon—is safe from his wrath.
