History Characters / DemonSlayerKimetsuNoYaibaMuzanKibutsuji

* HisOwnWorstEnemy: To put it simply, the one most responsible for Muzan's problems and eventual downfall is ultimately ''himself''. [[spoiler:His extreme anger issues, impatience, and sociopathy cost him his chance to live life as a normal human when he killed the doctor treating him before he could finish making the medicine meant to heal him. Then over a thousand years later, he ends up inadvertently killing the one person who could have helped him find the Blue Spider Lily that he'd been searching for to attain CompleteImmortality ([[AllThereInTheManual according to supplementary materials, anyway]]) which leads to her son eventually becoming the one to finally kill him]].

* HatedByAll: Muzan is despised by almost every single character in existence. The Demon Slayers want his head due to him siring demons and causing several atrocities via his minions, and [[ZeroPercentApprovalRating the demons themselves fear him]], and can't act against him due to Muzan being vastly superior to them, with Muzan openly discussing the ways to exterminate them. [[spoiler: The ones who have any respect for him, like Susamaru or Kokushibou, get vastly reminded of his cruelty as he dispatches the former brutally with his Geas and leaves the latter to die due to failing against the Demon Slayers]]. Really the only exceptions are Doma and Akaza who don't feel anything towards Muzan (the former is because he physically can't), and Gyokko and Enmu who are NightmareFetishist sadomasochists.

[[Characters/DemonSlayerKimetsuNoYaibaMainCharacters Main Characters]] | [[Characters/DemonSlayerKimetsuNoYaibaDemonSlayerCorps Demon Slayer Corps]] ([[Characters/DemonSlayerKimetsuNoYaibaHashira Hashira]]) | [[Characters/DemonSlayerKimetsuNoYaibaDemons Demons]] ('''Muzan Kibutsuji''' | [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizuki Twelve Kizuki:]] [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizukiUpperRanks Upper Ranks]] ([[Characters/DemonSlayerKimetsuNoYaibaKokushibo Kokushibo]] | [[Characters/DemonSlayerKimetsuNoYaibaHantengu Hantengu]])) | [[Characters/DemonSlayerKimetsuNoYaibaCivilians Civilians]] | [[Characters/DemonSlayerKimetsuNoYaibaDemonSlayerAcademy Demon Slayer Academy]]]]-]]]

* HatedByAll: Muzan is despised by every single character in existence. The Demon Slayers want his head due to him siring demons and causing several atrocities, and [[ZeroPercentApprovalRating the demons themselves fear him]], and can't act against him due to Muzan being vastly superior to them, with Muzan openly discussing the ways to exterminate them. [[spoiler: The ones who have any respect for him, like Susamaru or Kokushibou, get vastly reminded of his cruelty as he dispatches the former brutally with his Geas and leaves the latter to die due to failing against the Demon Slayers.]]

** [[spoiler:After Nezuko gains an immunity to the sunlight, he decides to stop creating demons all together as he had no need to turn random humans into test subjects anymore. Thus, the demon population slowly withered away and left the Demon Slayer corps obsolete by the end.]]

** Noticeably averted with Tanjiro [[spoiler: until he's about to die.]] Muzan looks down on Tanjiro as a weakling only stronger than an untrained civilian, and only pays him special attention in the form of offering a reward to any demon who can kill him because he reminds him of Yoriichi. [[spoiler: Even after Tanjiro has established himself to be as powerful as the Hashira and his sister has become the first demon to conquer the sun,]] he still looks down on him. Muzan only ever acknowledges his strength [[spoiler: in his final moments, and gives Tanjiro all of his blood in a last ditch effort to create a demon powerful enough to end the Demon Slayers. While he does succeed in creating the most powerful demon ever, Tanjiro is turned back into a human before he can kill anyone. Muzan may have won if he'd recognized Tanjiro's potential sooner and converted him by force earlier in the battle.]]

[[Characters/DemonSlayerKimetsuNoYaibaMainCharacters Main Characters]] ([[Characters/DemonSlayerKimetsuNoYaibaTanjiroKamado Tanjiro Kamado]] | [[Characters/DemonSlayerKimetsuNoYaibaZenitsuAgatsuma Zenitsu Agatsuma]]) | [[Characters/DemonSlayerKimetsuNoYaibaDemonSlayerCorps Demon Slayer Corps]] ([[Characters/DemonSlayerKimetsuNoYaibaHashira Hashira]] | [[Characters/DemonSlayerKimetsuNoYaibaYoriichiTsugikuni Yoriichi Tsugikuni]]) | [[Characters/DemonSlayerKimetsuNoYaibaDemons Demons]] ('''Muzan Kibutsuji''' | [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizuki Twelve Kizuki:]] [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizukiUpperRanks Upper Ranks]] ([[Characters/DemonSlayerKimetsuNoYaibaKokushibo Kokushibo]] | [[Characters/DemonSlayerKimetsuNoYaibaAkaza Akaza]] | [[Characters/DemonSlayerKimetsuNoYaibaHantengu Hantengu]]), [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizukiLowerRanks Lower Ranks]]) | [[Characters/DemonSlayerKimetsuNoYaibaCivilians Civilians]] | [[Characters/DemonSlayerKimetsuNoYaibaDemonSlayerAcademy Demon Slayer Academy]]]]-]]]

!!!'''Voiced By''': Creator/ToshihikoSeki (JP), Creator/GregChun (EN)[[labelnote:Other VA]]Luis Leonardo Suarez (Latin American Spanish), Creator/ClaudioMoneta (Italian), Yu Zhengsheng (Taiwanese Mandarin)[[/labelnote]]\\

* VillainHasAPoint:
** [[spoiler: As he receives the news of the deaths of Upper Moon Six, he states how Gyutaro's love for his sister negates his ability to become an even more powerful demon. Nothing new for a sociopath like him, but in a logical and pragmatic standpoint, it is true. Had Gyutaro let Ume go back when she died, she would have reincarnated immediately (and get a better life, just as Gyutaro wanted) instead of tagging along with him in hell. Or if the series' events take its course, it is Daki's needless cruelty lead her to be under the Demon Slayers' radar, her lack of foresight and arrogance into not considering to call her brother sooner before the battle truly started (or better yet, let Gyutaro deal with them alone), leading to the events of her and her brother dying at their hands.]]
** [[spoiler: Downplayed when it comes to his conflict against Tamayo. When he faces her again, he tells her that she has no one but herself to blame for her family's deaths, since she ate them after asking him to turn her into a demon. Tamayo protests that she only asked to become a demon so that she could see her children grow up, but admits that Muzan is right, which is why she will sacrifice her life to defeat him as atonement for her sins. It is downplayed because Muzan deliberately withhold the full details about the "cure" that he offered for Tamayo, [[NeverMyFault so he is one to talk about laying the full blame on her.]]]]

** If the wiki is to be believed, he eventually came to regret killing the doctor who was trying to cure him with the medicine, [[https://kimetsu-no-yaiba.fandom.com/wiki/Blue_Spider_Lily as seen here]]. Although, this was more likely because [[ItsAllAboutMe he realized he'd ruined his chances of gaining a perfect immortal body]], rather than any regard for the doctor's life.

* FatalFlaw: For all his power, Muzan is completely incapable of operating in sunlight. He has spent centuries trying to overcome this flaw, to no avail. [[spoiler:The revelation that Nezuko Kamado becomes able to overcome this makes her his eventual target, and his pursuit of the girl causes him to be lured by the Demon Slayer Corps' trap in order to finally slay him. He is eventually killed by sunlight itself while trying to possess Tanjiro.]]

* EvenEvilHasStandards: As much as a vile demon Muzan is, even he doesn't like [[TheSociopath Doma]].

* FromNobodyToNightmare: The lord of all demons who terrorized Japan from the shadows for almost a millenia was once a sickly human boy born into an aristocratic family from the Heian era who was not expected to see his 20th birthday.

* BerserkButton: Dislikes being called fragile or sick. He kills a random passerby, Yacchan, for calling him sickly and pale, conveniently ignoring the factor of him being drunk when he said that, with the latter's brother and sister-in-law subjected to a CruelAndUnusualDeath at his hands immediately after. Granted, considering his [[TheSociopath sociopathy]] and HairTriggerTemper, he'd have probably killed them anyway. [[spoiler:It's probably due to his terminal sickly origins, and his whole deal with getting immortality as a demon.]]

* HatedByAll: Muzan is despised by every single character in existence. The Demon Slayers want his head due to him siring demons and causing several atrocities, and the demons themselves fear him, and can't act against him due to Muzan being vastly superior to them, with Muzan openly discussing the ways to exterminate them. [[spoiler: The ones who have any respect for him, like Susamaru or Kokushibou, get vastly reminded of his cruelty as he dispatches the former brutally with his Geas and leaves the latter to die due to failing against the Demon Slayers.]]

[[Characters/DemonSlayerKimetsuNoYaibaMainCharacters Main Characters]] ([[Characters/DemonSlayerKimetsuNoYaibaTanjiroKamado Tanjiro Kamado]] | [[Characters/DemonSlayerKimetsuNoYaibaZenitsuAgatsuma Zenitsu Agatsuma]]) | [[Characters/DemonSlayerKimetsuNoYaibaDemonSlayerCorps Demon Slayer Corps]] ([[Characters/DemonSlayerKimetsuNoYaibaHashira Hashira]] | [[Characters/DemonSlayerKimetsuNoYaibaYoriichiTsugikuni Yoriichi Tsugikuni]]) | [[Characters/DemonSlayerKimetsuNoYaibaDemons Demons]] ('''Muzan Kibutsuji''' | [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizuki Twelve Kizuki:]] [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizukiUpperRanks Upper Ranks]] ([[Characters/DemonSlayerKimetsuNoYaibaKokushibo Kokushibo]] | [[Characters/DemonSlayerKimetsuNoYaibaAkaza Akaza]]) | [[Characters/DemonSlayerKimetsuNoYaibaHantengu Hantengu]]), [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizukiLowerRanks Lower Ranks]]) | [[Characters/DemonSlayerKimetsuNoYaibaCivilians Civilians]] | [[Characters/DemonSlayerKimetsuNoYaibaDemonSlayerAcademy Demon Slayer Academy]]]]-]]]

[[Characters/DemonSlayerKimetsuNoYaibaMainCharacters Main Characters]] ([[Characters/DemonSlayerKimetsuNoYaibaTanjiroKamado Tanjiro Kamado]] | [[Characters/DemonSlayerKimetsuNoYaibaZenitsuAgatsuma Zenitsu Agatsuma]]) | [[Characters/DemonSlayerKimetsuNoYaibaDemonSlayerCorps Demon Slayer Corps]] ([[Characters/DemonSlayerKimetsuNoYaibaHashira Hashira]] | [[Characters/DemonSlayerKimetsuNoYaibaYoriichiTsugikuni Yoriichi Tsugikuni]]) | [[Characters/DemonSlayerKimetsuNoYaibaDemons Demons]] ('''Muzan Kibutsuji''' | [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizuki Twelve Kizuki:]] [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizukiUpperRanks Upper Ranks]] ([[Characters/DemonSlayerKimetsuNoYaibaKokushibo Kokushibo]] | [[Characters/DemonSlayerKimetsuNoYaibaAkaza Akaza]]), [[Characters/DemonSlayerKimetsuNoYaibaTwelveKizukiLowerRanks Lower Ranks]]) | [[Characters/DemonSlayerKimetsuNoYaibaCivilians Civilians]] | [[Characters/DemonSlayerKimetsuNoYaibaDemonSlayerAcademy Demon Slayer Academy]]]]-]]]

* ForcefulTransformation: He subjects this to people a lot, whether it be innocent civilians or people he'd think would make formidable demons, he doesn't really take consent into account when turning people into demons.