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YMMV / Demon Slayer: Kimetsu no Yaiba

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  • Awesome Music:
    • Gurenge, the anime's opening. A sombre rock music that represents a glimpse of the series' tone. Sung by LiSA.
    • Episode 19's climax has The Song of Kamado Tanjiro, a beautiful, grandiose orchestral song by Go Shiina, which helped cement the scene as one of the greatest Awesome Moments of the anime season.
  • Complete Monster:
    • Kibutsuji Muzan is the first and mightiest demon. Obsessed with his own perfection, Muzan corrupts others into demons and develops the system where demons prey on humans, leading to countless innocent deaths, including the family and siblings of the young hero Tanjiro Kamado, as well as the demonic transformation of his young sister Nezuko. When encountered, Muzan escapes notice by turning an innocent man into a demon and siccing him on his wife before killing several other humans in a fit of pique when they trouble him. Muzan orders countless humans slaughtered, and when his subordinates, the Lower Demon Moons, disappoint him, Muzan massacres the survivors, deciding they are too weak to survive. Throughout the dark world of Kimetsu, Muzan repeatedly shows the monstrosity of demonkind.
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    • Gyokko is Upper Moon 5 and an insane artist who creates new pieces with his victims. Upon being sent to the swordsmith village, Gyokko decides to kill everyone in the village after murdering several smiths and taking others to fuse them into a macabre, living sculpture that he tortures by sticking swords through them, gleefully describing how he plans to replicate it on a grander scale with the village innocents. A complete narcissist, when Gyokko finds a smith more dedicated to his work than in noticing him, Gyokko opts to begin torturing him to try to break his concentration.
    • The twisted Enmu, Lower Moon 1, is the only survivor of Muzan's purge due to impressing Muzan with his love of suffering. Muzan promptly empowers Enmu and sets him after Tanjiro. With power over dreams and sleep, Enmu puts Tanjiro and his friends into pleasant dreams that reflect their hearts' desires, while tricking humans into entering their dreams to destroy their minds. Enmu promises to give train passengers kind dreams, but delights in twisting their dreams into horrific nightmares, and when cornered by Tanjiro opts to fuse with the train itself and try to devour all 200 passengers, gloating how he means to torment his victims before he eats them to strengthen himself even more.
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  • Crazy Awesome: Inosuke wears a googly-eyed boar's head as a mask. His default response to any situation is violence. He believes so earnestly in his own Insane Troll Logic that if he wasn't a Large Ham he could be The Comically Serious. And he'd probably be completely useless except that these traits have combined to make him a terrifyingly effective fighter.
  • Ensemble Dark Horse: Sabito and to a lesser extent, Makomo for their role in helping out Tanjiro and The Reveal that they are dead made them seen as Too Cool to Live and tragic in the eyes of the fandom. Sabito is especially so to the fandom due to his connection and relationship with Giyuu back when he is still alive.
  • Fandom-Specific Plot: Sabito lives AU's started to pop around after the latest arc in the Manga elaborated on Giyuu's relationship with Sabito. Sometimes, Makomo is also included to be alive in this AU.
  • Fanfic Fuel:
    • A color spread by the author depicting the 4 main characters swapped with each other's outfits as seen here has spawned numerous What If? stories and fanart of Nezuko being the swordswoman to Tanjiro's kind demon.
    • The Kimetsu Academy Highschool AU that appears at the end of some volumes has proven very popular with fans as a Lighter and Softer future where everyone reincarnated into a better life. Best seen in the novel's cover.
  • Fan-Preferred Couple:
    • Despite no hint of romantic feelings towards each other, Giyuu/Shinobu has become one of the most popular pairings thanks to their interactions in Natagumo Mountain Arc and Giyuu's side story chapter. Though sadly the ship is sunk hard with Shinobu's death.
    • Sabito/Makomo is quite popular, as they the only deceased Urokodaki's student who has made significant appearances together in the series.
  • Foe Yay Shipping: Douma/Shinobu. Due to the way of the former killing the latter by hugging Shinobu to death and Douma apparently gained feelings for Shinobu in the afterlife.
  • Growing the Beard: The Mount Natagumo arc is considered as the part where the series takes its peak by many readers.
  • Launcher of a Thousand Ships: Tanjiro has already been shipped with nearly everyone in Kimetsu no Yaiba as of this point in writing, from Zenitsu, Inosuke, Giyuu, and more.
  • Memetic Mutation: In Japan a meme surfaced in 2017 that briefly crossed this series over with The Promised Neverland, an image edit of Zenitsu being scared witless of Sister Krone made its rounds in Japanese imageboards, to the point Zenitsu somehow was voted the 29th most popular character in The Promised Neverland for its first official poll, while Sister Krone was voted the 59th most popular character in this series for its first official poll. Going even further the meme was in fact recognized by Shueisha itself in 2019, as they made a gigantic mural with hundreds of Shonen Jump characters being all over a school building, Zenitsu and Krone were paired together alone, creating the same effect of Zenitsu being scared of Krone as she looms behind him.
  • Moe: Nezuko. Just look at her! Even after becoming a demon, she doesn't lost her cuteness.
  • Moral Event Horizon: Kibutsuji Muzan has two acts almost back-to-back in his first appearance that cement him as an irredeemable monster: first turning an innocent random passer-by into a demon, who then proceeds to try and devour his wife due to uncontrollable demonic hunger, just to dodge Tanjiro and keep up his facade of considerate family man; then, now alone in a back alley, he gets accosted by a rowdy drunk and his two companions; after the drunk insults him by comparing Muzan's pallor to that of a dying man, he OneHitKills first the drunk and then his vengeful male companion, before going to the terrified female companion, and injecting her with so much of his blood that instead of turning into a demon, her body swells, breaks down and melts horrifically, with her staying conscious throughout until there's nothing left of her but an empty outfit. To make it worse, unlike her male companions, she hadn't personally done anything to arouse Muzan's ire.
  • Periphery Demographic: It’s an action-packed series meant for teen males and certainly delivers on the action but the male cast, which is the majority by far, are quite a few handsome men of varying tastes who manage to stay beautiful either when delivering major and gruesome beatdowns or being on the receiving end of one. With that, the series is very popular with females in Japan; resulting in most of the fan works being primally about the handsome dudes being even more fabulous to flat out being Yaoi pieces. At the other end of the spectrum, there are beautiful females as well, but they are very few although their fan works (especially Nezuko) are still quite ubiquitous.
  • Portmanteau Couple Name: Some pairings that have noticeable amount of fans got names like:
    • Tankana: Tanjirou/Kanao
    • Zennezu: Zenitsu/Nezuko
    • Giyushino: Giyuu/Shinobu
    • Sabimako: Sabito/Makomo
    • Obamitsu: Obanai/Mitsuri
  • Ships That Pass in the Night: There are some people who ships Inosuke/Aoi. Mostly came from Tanjirou/Kanao and Zenitsu/Nezuko fans as a ship mate.
  • Unpopular Popular Character: Zenitsu is considered to be a loser by almost all of his past acquaintances before meeting the main cast, and even if he has friends now there are still new people Zenitsu meets who don’t like him, yet he is very popular among the fandom, once scoring 2nd place in an official poll only behind the loved-by-all protagonist Tanjiro himself. This is made even more curious by the fact Zenitsu is disliked by many of the girls he tries to impress, but is loved by a fandom that has a gigantic female presence in it.
  • Viewer Gender Confusion: While Rui's clothing is actually in a masculine style, the rest of his design is quite feminine. As a result, some fan translations refer to him as female.

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