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  • Ass Pull: Arguably several, which some attribute to the series' fast pace and reliance on flashbacks.
    • The fight with Rui has several of these that happen very quickly:
      • Though there is mention made of Tanjiro coming from a family that works with fire, nothing implied his father knew any sort of dance, or that said dance doubled as a combat technique. After having a near-death experience fighting Rui and about to be killed, Tanjiro suddenly remembers his father's dance and, without prior practice, executes it perfectly enough to go after Rui with it before he's stopped.
      • Right after this, Nezuko wakes up after hearing her mothers voice, and, without any prior hinting or setup, uses her Blood Art to save Tanjiro from performing a Taking You with Me.
      • Finally there is Rui's survival when Tanjiro clearly beheaded him, with the explanation of "I cut my own head off first".
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    • In a similar vein, Tanjiro's father knowing how to access the Transparent World is given no buildup, though Tanjiro once again taps into his memories and learns to use the ability, allowing him to hold his own against Akaza, whom he and Giyu were previously outmatched against.
    • During the Swordsmith Village fight, Tanjiro remembers Zenitsu explaining how to run using Thunder Breathing. Despite Zenitsu himself (who knew it better than anyone) saying it was hard to grasp, Tanjiro learns to activate it successfully on his first try and catches up with Hantengu.
    • The revelation that Muzan was fed two poisons. Following that is the borderline comical reveal that Tamayo included two more poison effects: one that prevents him from splitting his body up, and another that slowly kills him from the inside.
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  • Author's Saving Throw: While the finale was beloved by many readers, some felt it was lacking because we only get to see a part of the protagonist's lives after exterminating the demons. The final volume rectifies this by adding all of the content cut from the magazine release in order to smooth the transition over from the Taisho era to the Reiwa era.
  • Base-Breaking Character:
    • Zenitsu is an Unpopular Popular Character in Japan, but he's rather contested in the Western fandom, with some finding his rather desperate attitude towards girls and frequent screams of fear grating. It also doesn't help that early on, the only times he actually becomes an effective fighter is when he is in a sleep-like trance. His self-righteous nature, especially when it comes to girls didn't help neither. Even beyond that, his introduction, where all of these issues are on display at once, caused many western fans to write him off because of how bad his introduction can be to newcomers. Still, Zenitsu is also liked enough by others for being a genuinely kind person and while he is loudl and cowardly, he has never given into it, or abandoned anyone to demons like other cowardly characters.
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    • Muzan is another divisive character between the fandom. Some consider him to be a good main villain due his opposite nature to Tanjiro, and find his acts of gratuitous cruelty and cowardice to be necessary to remind the readers that he is completely evil, while others, however, find him to be a boring main antagonist whose lack of redeeming qualities makes him uninteresting compared to other supporting antagonists with a better background. That the final battle against him ended being underwhelming to many fans compared to the Upper Ranks didn't help.
  • Better on DVD: The Upper-6 fight in the Red Light District arc, by far the longest antagonist fight in the series, until the very final fight dethroned it (by just one chapter), is much more enjoyable in collected volume form; some people who had to follow it weekly weren’t having a good time after a certain point, where cries of dragging on could be heard.
  • Complete Monster: Throughout this dark world, the following demonstrate the monstrosity of demonkind:
    • Muzan Kibutsuji was born a sickly child in the Ubuyashiki family, but through a doctor's attempts to cure him incidentally became the first and mightiest demon and grew obsessed with his own perfection. Corrupting others into demons by preying on their weakness at their lowest then infecting them using the special properties of his blood, Muzan develops the system where demons feed on humans en masse for power, leading to countless innocent deaths as he maintains this system for over one thousand years, with his blood poisoning and painfully killing any who so much as utter his name. Muzan is also personally responsible for killing the mother and siblings of the young hero Tanjiro Kamado, as well as the demonic transformation of his younger 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 Ranks, disappoint him, Muzan massacres the survivors, deciding they are too weak to survive. Later attempting to massacre all of the Demon Slayers, when Muzan knows death is inevitable he intends to turn Tanjiro into a demon to kill them in his stead. A sadistic, cowardly sociopath predicating a survivalist society of bloodshed to maintain his own safety, Muzan stands responsible for the most death and suffering in the series.
    • Gyokko is Upper Rank 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 to noticing him, Gyokko opts to begin torturing him to try to break his concentration.
    • The twisted Enmu, Lower Rank 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.
    • Chapter 188 ("Sorrowful Love"): The unnamed snake demon in Obanai Iguro's past was a low-level demon with a hunger for children. Bargaining with Obanai's family, the demon would murder people to allow the all-female bandits to live off the stolen wealth in return for them providing the demon with newborn babies on a steady stream to consume. Upon Obanai's birth, the demon had him raised and prepared as a meal, as he was the only boy and had alluringly unusual eyes. Having Obanai's face mutilated to resemble her more, the demon massacred all but one of Obanai's family upon his escape before closing in on him to eat him as well.
  • 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.
  • Critical Research Failure: A relatively minor example in Chapter 144, which could be attributed to the translation. When telling Kaigaku about how their master committed suicide over Kaigaku becoming a demon, Zenitsu says, "When you commit seppuku, someone has to cut off your head, or you suffer in agony before you die!" As the main Seppuku page shows, the kaishakunin does not actually decapitate the person committing seppuku, but merely cuts through the neck to leave the head barely attached to the body.
  • Crosses the Line Twice:
    • Zenitsu's furious rant to Tanjiro and Inosuke about how they should be grateful to train with cute girls really highlights his desperately horny attitude towards women (particularly when he points out how the training gives them the excuse to touch them everywhere with no consequence), but the way he delivers the rant in such an over-the-top way makes it loop right around to being hilarious.
    • Inosuke's lack of knowledge can sometimes cause some unintentionally dark and offensive scenes (such as not knowing how scattering ashes works and asking if you're supposed to eat them), but considering it's Inosuke, it loops right back to being hilarious.
  • Designated Hero: Kagaya is a lot less morally upstanding than the All-Loving Hero that the story shills him as. While he may take the effort to remember the names of all the slayers under him who are killed in the line of duty, he also indirectly causes many of those deaths by sanctioning the brutal Final Selection. Instead of say, having the new blood go on a few missions alongside more experienced slayers first so they can learn relatively safely, trainees who have never even fought one demon yet are thrown straight into the deep end against dozens of them, which the majority of applicants don't survive.
  • Draco in Leather Pants:
    • His looks and cheerful personality make Doma get this treatment from some fans, especially when it comes to his relationship with Kotoha, where he becomes Inosuke's forefather.
    • Many fanworks depicting the relationship between Zenitsu and Kaigaku before his demonization often downplay, if not erase, the latter's negative qualities up to the point of Wimpification.
    • Muzan also gets this, thanks to his appearance. Some fans comes as far as to ship him with Tanjiro.
  • Ending Fatigue: While the bulk of the Infinity Castle arc is very well received, the final battle against Muzan himself once the Castle collapses has had a more lukewarm reception, as most consider Muzan a rather boring antagonist compared to the Twelve Kizuki. Additionally, his fighting style consists entirely of flailing several tentacles and abusing his high level of regeneration, which makes a rather repetitive and boring fight, especially compared to the more complicated fights against Kokushibo, Doma and Akaza, all of whom use a myriad of different techniques and abilities instead of just using small variations of the same one. Even when he is finally killed, the arc refuses to end, with Tanjiro being brought back from the dead by him and turned into a demon, becoming the manga's Post-Final Boss.
  • Ensemble Dark Horse:
    • Sabito and to a lesser extent, Makomo for their role in helping out Tanjiro and the reveal that they were both Dead All Along 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 Giyu back when he was still alive.
    • Mukago is significantly more popular than other Lower Ranks (excluding major antagonists Rui and Enmu) for being the only female.
    • For a character that wasn't even the main antagonist of the arc where she appeared, the Spider Demon Mother gained some popularity thanks to her attractive design, tragic backstory and beautiful death scene, becoming the most loved member of Rui's fake family after Rui himself.
  • Estrogen Brigade: As stated down in Periphery Demographic, the series is very popular with women due in part to the large unique looking cast of pretty boys.
  • Evil Is Sexy:
    • Muzan Kibutsuji, the lord of demons, is a Man of Wealth and Taste with glossy black hair, pale skin, and slender features. His female form has also gotten a lot of confused feelings out of a lot of people. And with his new demon form as of chapter 180, he's gone completely shirtless and is essentially naked, using dark red colored demon skin to cover up his bottom. This has gotten the attention of fans, some even complimenting his new look.
    • Doma is overall the most attractive male member of the Twelve Kizuki. Not only is he a rare instance of a not having his face covered by creepy markings or disfigured by other means, but his tight long-sleeved shirt shows that he is also surprisingly muscular. This alongside his insouciant personality greatly contributed to his fan base.
    • Daki was this to the point that she could use it to maintain the guise of a High-Class Call Girl until the Demon Slayer Corps forces her to reveal herself.
    • Susamaru, despite of her brief role, is remembered for being a relatively rare example of an Amazonian Beauty in a Shōnen series.
    • Akaza, being a martial artist who is also a Walking Shirtless Scene, with the markings around his body looking more akin to tattoos.
  • Fandom Rivalry: With One Piece due to being the first manga in twelve years to have dethroned it as the best-selling manga of the year.
  • Fandom-Specific Plot:
    • Many fics do a role swap where Tanjiro was the one turned into a demon while Nezuko was away for whatever reason, and she's the one that becomes a Demon Slayer.
    • Sabito lives AU's started to pop around after the latest arc in the Manga elaborated on Giyu's relationship with Sabito. Sometimes, Makomo is also included to be alive in this AU.
    • Tanjiro remaining a demon AU have begun popping up after Chapter 202.
  • Fanfic Fuel:
  • Fanon: A lot of fanart of an older Zenitsu like to draw him with a long ponytail.
  • Fan-Preferred Couple:
    • Despite the lack of blatant hints of romantic feelings towards each other in the original manga, Giyu/Shinobu has become one of the most popular pairings of show thanks to their interactions in the Natagumo Mountain Arc, volume extras, Giyu's side story chapters, and the second fanbook stating that, according to Gyomei, both enjoy talking to each other. Though sadly the ship sunk with Shinobu's death.
      • Somewhat sunk in the future epilogue where their reincarnated selves have an fairly noticeable age gap along with the revelation in the last volume extra that Giyu's look-a-like is his descendant, Gichii (although, given Japanese laws regarding descendants and adoption, its possible that Gichii's relation to Giyu ultimately stems from Giyu adopting an heir, meaning that said descendant would have no parent-offspring blood ties to Giyu). This has resulted in some fans giving Gichii a Precocious Crush for Shinobu's reincarnation.
    • Sabito/Makomo is quite popular, as they are the only deceased students of Urokodaki who have made significant appearances together in the series.
    • Giyu/Sabito became incredibly popular after it was revealed they were both students of Urokodaki, with Giyu still mourning over Sabito's untimely death years later.
    • Sanemi Shinazugawa and Kanae Kocho have only interacted exactly once, in a flashback to when Sanemi became a Hashira and met Kagaya, but fanart of them as a couple or romantically interested in each other can be found, and things have only escalated further once the Kimetsu Gakuen universe has showed Sanemi and Kanae, both teachers, interacting in the illustrated extras for Volume 18. Taken further after the second fanbook reveals that Sanemi likes Kanae, according to Gyomei's observations.
  • Foe Yay Shipping: The top three ranked members of the Twelve Kizuki each have at least one instance:
    • Doma/Shinobu, due to how the former kills the latter by hugging Shinobu to death, and Doma stating he's fallen in love with Shinobu as he's dying.
    • Akaza's intense battle with Rengoku and offering the latter to become a demon so that they could advance in the ranks of the Twelve Kizuki together. Ironically, Akaza ends up killing Rengoku.
    • Kokushibo and his brother Yoriichi Tsugikuni have a ton. Since their childhood they were incredibly fixated on one another. While Michikatsu spent most of his life envying and loathing his younger twin brother Yoriichi, in his final moments he admits to him self that Yoriichi is the only family member whose face he still remembers and outright exposes his own self-loathing by asking of the long-dead Yoriichi why he was born. Yoriichi in turn, willingly left home at a young age for Michikatsu's sake and spent most of his life wrapped in melancholy and was absolutely devastated by his older brother turning into a demon. Of a particular note is the flute Michikatsu made for Yoriichi when they were kids; Yoriichi hold onto it (the actual quality of which was doubted by Michikatsu himself) up until his death, only for Kokushibo to keep the sliced up pieces of the flute for centuries after Yoriichi's death. It doesn't help that this relationship was the main reason neither of them could live a peaceful family life.
  • Fountain of Memes:
    • Almost anything that Nezuko does is gonna be met with being turned into a meme. It's gotten to a meta point of posting memes about Nezuko memes.
    • Inosuke's Insane Troll Logic produces quite a few memes.
    • The climatic battle against Kokushibo resulted in lots of memes, notably Kokucat (drawings of cat versions of him, which are rather ridiculous as they always carry on his six eyes, which is of course hilarious in a cat), "Enter Godjima", "Fuck kids" a meme spawned for the fact that two teenagers, Muichiro and Genya, had to sacrifice themselves to land a blow into Kokushibo, while Himejima's downright cold and unfeeling reaction to it along with his complicated backstory resulted in the fandom deciding that he absolutely despises children and in fact gets a power up from them dying. Kokushibo himself has been a bit of a fountain, as his visage with six eyes produces a lot of amusing fanart, such as him wearing ridiculous sunglasses or taking the time to apply eye shadow to each of them.
  • Friendly Fandoms:
    • With Part 1 and 2 JoJo's Bizarre Adventure due to the fact that both series involve characters using breathing techniques fighting off supernatural threats weak to sunlight and who feast on humans.
    • Anime fans that like the music of Michael Jackson given that Muzan Kibutsuji looks a bit like him.
    • Kimetsu No Yaiba goes well with Dororo since both of their anime adaptations aired in 2019 and both of their stories are told in Japan, they both show fighting demons, and both series are about recovering the humanity of a loved one.
    • A minor one, but in fact, Kimetsu no Yaiba and Kamen Rider Hibiki also have commonality between each other since both series show good and heroic oni (how they are referred to in Japanese for Kimetsu no Yaiba) that fight for humanity, training to become stronger, and using fighting styles and skills in battle. They both also have ending issues, but for different reasons (Arc Fatigue for Kimetsu no Yaiba and the infamous Executive Meddling and Retool for Hibiki).
  • "Funny Aneurysm" Moment:
    • Zenitsu comically throws a long rant about how Tanjiro and Inosuke shouldn’t dare to feel broken over taking part in such a grueling training for demon slayers, during their first stay in the Butterfly Estate, because according to Zenitsu being trained by cute girls(especially the game of tag, in which the goal is to touch the girls) is the only thing that matters, and that will always be good regardless of how tough the training is, Zenitsu tells them to commit seppuku for acting like that. Much later in the series a seppuku becomes one of the biggest tragedies in Zenitsu’s life, for his beloved master Jigoro commits said ritual suicide in order to repent for his other disciple, Kaigaku, betraying the demon slayers by becoming a demon himself.
    • Shinobu's remark that Giyu doesn't have any friends initially comes off as comedic, mainly because of Giyu's reaction to it. However, it's a lot less funny as of the Hashira Training arc, when it's revealed that he distances himself from his other Hashira due to feeling unworthy of his title as Water Hashira due to Survivor Guilt. Considering that Shinobu, like Giyu, are all victims of demon attacks and even she has an unhealthy way to cope up with her pain, it comes instead as a mean-spirited remark from her. And while the memes about this scene are still rolling, it somehow loses its levity after the readers finally learn Giyu's issues.
  • Gateway Series: The anime adaptation's Episode 19 brought Demon Slayer into a huge radar online, especially when it got famous people like Brendon Urie praising the series and its music. And since it was heavily talked-about in 2019, it managed to attract newcomers into the anime fandom. In a more specific case, the popularity of Demon Slayer made anime fans curious of other/older Shōnen series with a similar premise of "demon slaying in Japan", such as Blue Exorcist, Dororo (2019), Inuyasha or Ushio and Tora.
  • Germans Love David Hasselhoff: Inosuke has become a greater hit with oversea audiences than he is in Japan, he is popular there no doubt, but not consistently high enough in several circles, official or fan based; meanwhile western audiences clicked with Inosuke much easier, the guy has been a source of memes left and right.
  • Growing the Beard:
    • The Mount Natagumo arc is considered as the part where the series fully settles on itself, introducing several different, interesting demon characters as well as a fully fledged member of the Twelve Kizuki, Lower 5: Rui. It helps that the climax of the arc was exceptionally well animated.
    • Another point often cited as one of the moments the series takes a step further is the Red Light District arc, and the climatic showdown of this arc against Upper Rank 6, Daki and Gyutaro is widely considered one of the best fights in the series.
  • Harsher in Hindsight: The Fandom-Specific Plot about Tanjiro being a demon becomes this after he becomes a Demon in Chapter 201. Complete with Muzan's memories.
  • He Really Can Act: Mark Whitten's performance as Rengoku in the English dub of the TV series received a lukewarm reception at first, as it was seen by some as being quite lackluster at that time. When the Mugen Train movie was released in English, his performance has noticeably improved and was praised by reviewers as being one of the best for portraying Rengoku in a more complex manner with a wider range of emotions. Some highlights include his dream sequence with his father and brother near the beginning, his fight scene with Akaza during the climax as well as his final scene with Tanjiro before passing away.
  • Hilarious in Hindsight:
    • Inosuke is voiced by both of Kirito's voice actors. In a hilarious coincidence, Yuki Kajiura, one of the composers for the Sword Art Online OST worked on Inosuke's theme as well.
  • Ho Yay:
    • After he's unmasked, Tanjiro straight up tells Inosuke that his face is attractive. On Inosuke's end, his reactions to Tanjiro complimenting him can easily be read as him being a Tsundere.
    • During the Hashira Training arc Genya and Tanjiro grow very close, with Tanjiro becoming very protective of Genya, and Genya in turn gaining a deep sense of trust and admiration for Tanjiro.
    • The close, yet somewhat ambiguous relationship between Tanjiro's ancestor Sumiyoshi and Yoriichi Tsugikuni. Basically, Yoriichi saved Sumiyoshi's life and later on frequently visited Sumiyoshi's house. In turn, Sumiyoshi is possibly one of the few people who personally knew Yoriichi and was vexed by Yoriichi's forlorn view of his own life and was even shown crying for Yoriichi's sake. Sumiyoshi's family wounded up carrying the legacy of the bond between the two men for generations to come: the Hinokami Kagura, which is implied to be the closest thing there is to a recreation of the original Sun Breathing, as well as the same hanafuda earrings Yoriichi had. Centuries later, Muzan outright associated Tanjiro with Yoriichi based solely on their physical similarities.
  • Hype Backlash: Due to gaining an explosive following thanks to Episode 19's climax, there are now plenty who have come to treat the series with disdain, claiming it is only carried by the adaptation's animation and saying it does not deserve the popularity it received with some people claiming that without the anime adaptation, the manga would've stayed in obscurity. Beyond that, the series explosive growth in a short time resulted in a number of new viewers finding the show to not live up to said hype, especially in regards to the story and characters.
  • Incest Yay Shipping:
    • The Shinazugawa brothers are paired together given their extremely deep attachment to one another.
    • The Tsugikuni brothers Michikatsu a.k.a. Kokushibo and Yoriichi are also paired due to their complicated dynamic.
  • It's Popular, Now It Sucks!:
    • Related to Hype Backlash above, the series didn't have a noticeable amount of hate prior to Episode 19. Upon said episode airing (and the anime finishing its run), more people are starting to resent the series's rapid popularity. The fact that the manga sales skyrocketed soon after doesn't help.
    • The opening "Gurenge" has similar treatments due to popularity and awards it received. While the opening is fine, the fact it gets as much praise despite being not all that visual unique or interesting lead to many feeling it only won or gets recongnition because the show is popular.
  • Launcher of a Thousand Ships:
    • Tanjiro has already been shipped with nearly everyone in the series as of this point in writing, from Zenitsu, Inosuke, Giyu, Genya, Rengoku, Kanao and more.
    • Zenitsu is likewise shipped with many characters: other than Nezuko, he is also paired with Tanjiro, Inosuke, Kaigaku, Uzui and others.
    • Among the villains, that would be Doma. Aside of Shinobu and Kotoha, he is frequently shipped with most of his fellow Twelve Kizuki (most often with Akaza or Kokushibo) as well as Muzan.
  • Love to Hate: Doma is as despicable as he is amusing, frequently teasing his co-workers and committing evil acts that are both macabre and hilarious, all with a relaxed smile on his face. As such, it is not uncommon for fans to hate him, yet enjoy his villainy at the same time.
  • Magnificent Bastard:
    • Kagaya Ubuyashiki is the brilliant leader of the Demon Slayers Corps. A kind man who loves his subordinates like his own children, Kagaya is still willing to go to extremes to see the monstrous Muzan Kibutsuji dead, subjecting the trainees to a potentially deadly selection process where they have to fight captive demons, while also memorizing the names and faces of every single Demon Slayer who dies. A genius planner, Kagaya keeps Muzan and his forces at bay through a complex hiding system to defend his strongholds and sets plans to move and crush the powerful Twelve Kizuki of the demon forces. Captivating the love of his subordinates with his natural charisma, Kagaya uses himself, his wife and his two eldest daughters as bait for Muzan himself to sacrifice all their lives in an explosion and give the Demon Slayer elites a chance to kill Muzan for good.
    • Kokushibo, Upper Rank 1, was born Michikatsu Tsugikuni and joined Muzan to stave off death in order to grow more powerful. Almost wiping out the Demon Slayers, the only warrior to ever exceed him in power was his younger twin Yoriichi, whom Kokushibo was never able to fully cease loving. In modern times, Kokushibo is undefeated, killing countless Demon Slayer elites and manipulating some, such as Kaigaku, into becoming demons before casually dominating the battle with his descendant Muichiro Tokito. Engaging the strongest of the Hashira and concealing his true power to catch them off guard, Kokushibo takes every chance to show why he is the strongest of the Kizuki.
    • Akaza, Upper Rank 3, was born Hakuji and adopted his Social Darwinist beliefs after the deaths of his loved ones and becoming a demon under Muzan. Baiting a Hashira into combat, Akaza mortally wounds him to tempt a strong opponent with demonhood, yet respects the man's decision to die human when he refuses. Returning later, Akaza shows his full tactical abilities while facing both hero Tanjiro Kamado and another Hashira simultaneously. Constantly switching maneuvers to keep them on the defensive, Akaza even dies by his own hand, foregoing a chance to kill his opponents to commit suicide and reunite with his family.
  • Memetic Loser:
    • Poor, poor Tomioka. A single comment from Shinobu saying that he has no friends and that nobody likes him, and he becomes the fandom's laughing stock. It even translates to real life, where cosplayers at conventions dressed as various other characters (pretend to) bully Tomioka cosplayers. This has also leaked into advertising — there have been sightings of Tomioka posters set up separate from those of the rest of the Hashira, intentional or otherwise.
    • Some portions of the fanbase see Doma as this as despite his cheery and friendly attitude none of the other Upper Ranks like him at all, in fact, several of them can't even stand his presence. Further fueling this, during the fight against him in the Infinity Castle arc several characters brutally insult him to his face, which adds to this.
  • 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; the meme persisted in 2020, as the series 2nd official poll still got its votes for Sister Krone, even rose to 49th place. 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.
    • The scene from episode 21 where Kanao chases the shrunken Nezuko spawned various memes.
    • Tanjiro's look of disgust at Zenitsu when they first meet has gotten a lot of traction as a reaction image. Fan artists even sometimes find it mandatory to include whenever Giyu draw Tanjiro or Nezuko in Tanjiro's role.
    • No one likes Giyu.
    • After the "I am not disliked by people" scene and the discovery that Giyu shares the same voice actor as Reigen Arataka, a spin-off of the #RedrawReigen meme kickstarted but with Giyu and the other Hashira called #RedrawGiyu.
    • Shinobu and Tanjiro on the roof.explanation 
    • Kaigaku's Early-Bird Cameo in the anime lead to an avalanche of parodies of the flashback, whether it is about the peaches he was eating, him throwing those peaches at Zenitsu, or Kaigaku's open shirt exposing his pecs which likewise became infamously common in fan art.
    • "You mustn't laugh! You mustn't, you mustn't, you mustn't!"
    • Comparing Muzan to Michael Jackson due to the former's resemblance to the latter in the Smooth Criminal music video.
    • The series' constant comedic Art Shifts have gotten a lot of traction as reaction images. Most prominent are the interactions between Tanjiro and Kanao in Episode 26. This artstyle is often called as "potato" by the fandom
    • Boku wo...tsurete... SUSUMEEEEEEEEExplanation 
    • FlowersExplanation 
    • And now, time for a Taisho secret!Explanation 
    • Kirito Demon Slayer/Kirito no YaibaExplanation 
    • Tsuyuri "Two-Face" KanaoExplanation 
    • BUCKETS!Explanation 
    • Oyabun InosukeExplanation (slight spoilers) 
    • Ara Ara SayonaraExplanation 
    • Muzan's extreme mistreatment of his own demons has earned notoriety in the Japanese fandom, spawning many memes about "black company" (ブラック企業 burakku kigyō) and "power harassment" (パワハラ pawahara).
    • Self Slayer: Jimetsu no Yaiba (自滅の刃 Jimetsu no Yaiba)Explanation 
    • Hantengu's two-page flashback has spawned parodies, most notably ones that cross this series over with We Never Learn.
    • Gonpachiro KamabokoExplanation 
    • Teoni getting pissed over how they were in a new era became a topical meme as the Anime version of the Final Selection Arc coincided with an IRL change in the era (Heisei to Reiwa). The Kimetsu official Twitter account jumped on the meme bandwagon as well.
  • Memetic Troll:
    • As #RedrawGiyu will show you, Shinobu's "no one likes you" comment to Giyu has propelled her into this status among the fandom. It just gets more cemented based on her interactions with Tanjiro, Zenitsu, and Inosuke.
    • Fittingly, Doma's personality likewise makes him one in some fan comics.
    • Nezuko gets hit with this whenever fanartists feel like portraying her screwing around with other characters as intentional rather than an accidental consequence of her regressed child-like mental state.
  • Moe:
    • Nezuko! She looks cute, has endearing love for her siblings and even after becoming a demon, she doesn't lose her cuteness. She gains cuteness because her mannerisms as a demon come across as endearing, regardless of whether she is snarling at someone, crawling into her box, or sleeping. Any given viewer is likely to see her as just as precious as her devoted brother does.
    • Kanao was pretty adorable to start with, but fans are particularly fond of her utterly bemused expressions any time someone (usually Tanjiro) throws her off her stride.
  • Moral Event Horizon:
  • Movement Mascot: The series is very popular in Chile. When the social movement started on October 2019 against the president Sebastian Pinera, Inosuke became the mascot of the movement, having A LOT of fanart of him battling police and being part of the movement as another Chilean, even having his own place in the national emblem. As a way to support Chile, other fellow Latin American countries like Bolivia and Peru (also in conflict with their governments) adopted the series' other main characters as their mascots.
  • Never Live It Down: The unnamed Demon Slayer who brags that he can kill Rui only to be easily killed himself. His death by mutilation has earned him the nickname "Diced Steak Senpai".
  • One-Scene Wonder: In Japanese, the remaining Lower Ranks are voiced by some really famous voice actors who were hired to just voice these really minor characters, Natsuki Hanae (Tanjiro) even jokingly expressed disbelief on getting these big shots to “waste” them like that.
  • OT3:
    • The main trio Tanjiro x Zenitsu x Inosuke.
    • The top three Upper Ranks Kokushibo x Doma x Akaza.
    • Sumiyoshi x Suyako x Yoriichi.
  • Periphery Demographic:
    • It’s an action-packed series meant for preteen and teen boys and it 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 female readers in Japan, resulting in most of the fan works being primarily about the handsome dudes being even more fabulous to flat out being Yaoi pieces. At the other end of the spectrum, there are beautiful female characters as well; while they're generally outnumbered by male characters, their fan works (especially Nezuko) are still quite ubiquitous. Tanjiro being a genuinely kind and emotionally mature male lead in a genre not typically known for that is also a huge draw. Then there's Nezuko, who is a great subversion of the Damsel in Distress, actively assisting her brother on his missions instead of being passive motivation for his quest. And on top of that, their relationship is genuinely one of familial love, without any Incest Subtext that plagues a lot of brother-sister stories throughout various manga genres.
    • A surprising amount of Japanese children who are younger than the manga's targeted age demographic have become fans of the series, likely due to watching it along with their parents. This likely contributed to the Mugen Train movie doing so well at the box office (though even then, there was still some concern from parents over whether the movie was appropriate for children). There was even a poll that revealed that some kids (mostly little girls) admire Tanjiro more than their own parents.
  • Portmanteau Couple Name: Several pairings with noticeable amount of fans got names like:
    • Tankana: Tanjiro/Kanao
    • Zennezu: Zenitsu/Nezuko
    • Inoaoi: Inosuke/Aoi
    • Giyushino: Giyu/Shinobu
    • Sabimako: Sabito/Makomo
    • Obamitsu: Obanai/Mitsuri
    • Inotan: Inosuke/Tanjiro
    • Tanzen: Tanjiro/Zenitsu
    • Inozen: Inosuke/Zenitsu
    • Sabigiyuu: Sabito/Giyu
  • Rescued from the Scrappy Heap: Iguro was at first one of the least popular Hashira, mainly due his lack of heroism in the manga compared to his fellow Hashira and for generally being an unpleasant character. However, his role in the final battle against Muzan, where he not only received the characterization he needed that really justifies his complex, but also proved to be one hell of a fighter that wouldn't stop attacking Muzan no matter how hurt he was and saved Tanjiro multiple times through the fight, ended earning him the respect and love of many fans. It went to a point that, even some of the fans who didn't like the fight against Muzan admitted that the part of Iguro was the saving grace of an otherwise mediocre and dragged on last battle.
  • Self-Fanservice:
    • Many drawings depicting Hantengu prefer using his younger-looking, more attractive emotions.
    • Gyutaro in canon is flat-out called ugly several times, even by himself. Fans occassionally throw him a bone by either distancing his anatomy from the canonical Uncanny Valley, OR - especially in the case of the modern AU - making him Ugly Cute.
  • Ships That Pass in the Night:
    • There are some people who ship Inosuke/Aoi. The phenomenon mostly came from Tanjiro/Kanao and Zenitsu/Nezuko fans as ship mates. Possibly because of this popularity, they got some Maybe Ever After hints in the final 2 chapters, before Aoba is officially listed as their descendant in the final volume's extras.
    • Giyuu and Shinobu do have some scenes together, but their relationship is never as close as fandom makes it out to be.
    • One of Zenitsu's biggest ships in the Japanese fandom, Uzui/Zenitsu, is based on the latter's seething jealousy and annoyance over the other man. They don't interact much in-story other than this, but it gets to the point where even their descendants are paired off in the finale.
    • Shinobu and Mitsuri never directly interact, although Mitsuri thinks about Shinobu twice and affectionately calls her "Shinobu-chan"(as opposed to how she calls Iguro by his surname). Despite that, the pairing has a significant following among yuri shippers.
  • Signature Scene:
    • The ending fight of Episode 19, considered the moment the series Grew The Beard and spectacularly demonstrated its quality for those still in doubt.
    • On a more memetic level, the more commonly talked about scene you'll likely come across is from Episode 21 where Kanao chases a shrunken Nezuko.
    • From the manga (a point that the anime will reach up to eventually) in chapter 126, Nezuko walking in sunlight and talking again is a key scene and major plot point that was established, giving her character a major change and making her even more important in the plot. Nezuko's appearances after chapter 126 and in some covers show her smiling more often.
  • They Wasted a Perfectly Good Character:
    • Except for Enmu and Rui, the remaining Lower Ranks are slaughtered by Muzan in their first appearance, without giving them the chance to show their abilities or background.
    • Kaigaku, the replacement Upper Rank Six, is seen as this by many. Though Zenitsu makes note of the history between them, the first time he is properly introduced to the audience is in the very last arc of the series, with only a few small cameo appearances prior. From there, he puts up a fight for no more than 3 chapters before he's dispatched in one blow.
    • Upper Rank Five Gyokko feels like this for some fans. Unlike other Upper Ranks who offered incredible battles and proved to be fearsome enemies, his fight against Muichiro was very one-sided from beginning (where Gyokko easily overpowered the Hashira) to end (where Muichiro in return defeats Gyokko swiftly once he awakes his Mark), making him a plot device to introduce the Demon Slayer Mark and to show how strong Muichiro is after awakening it. To make things worse, nothing about his backstory or past was revealed through his screentime, leaving him as a less compelling character even compared with less relevant antagonists like Kyogai or the Spider Mother.
    • Nakime the Biwa demon. She appears way before the Upper Ranks, seems to be Muzan's most trusted subordinate, and after Hantengu's death she's ascended to the rank of Upper Rank Four. However, once she gets her turn to fight, she barely does anything other than toy with Obanai and Kanroji, and then she's killed by Muzan without second thoughts once Yushiro takes control over her body, without the audience managing to learn anything about her personality or backstory.
    • Some have said that Doma, being a cult leader and having a very entertaining personality, would have served extremely well in a standalone arc that involves the demon slayers investigating a mysterious cult. As is, he just gets a brief fight against Kanao and Inosuke, being bunched into the final arc like the rest of the remaining Upper Ranks.
    • There are fans who view Tengen Uzui's remaining brother as this, being given a unique design and interesting backstory during his very brief appearance in Tengen's flashback. He is also described as having no humanity remaining, giving some the impression that he would return later on as a demon, a ninja demon. The fact that the new Upper Rank-5 who replaced Gyokko was never revealed only fuels this, as some speculated it would be revealed as Tengen's brother at some point. There was even a potential set-up in the final arc for the two to meet again if that were the case; Tengen protected the vulnerable Kiriya during the events of the final battle and many had hoped the new Upper Rank would finally show up to make an attempt on his life, and Tengen's brother being that demon would've brought his story full-circle, facing and ending the monster that he could've become. But neither plot point involving the brother or the new Upper Rank were ever addressed after their initial mention, leaving fans disappointed. The second fan book finally sheds some light on what happened to Tengen's brother, revealing that there was an incident where he was forced to kill him.
  • They Wasted a Perfectly Good Plot: Tanjiro is only a demon for about two chapters before he's cured and that's...pretty much it, really. Many feel that this was wasted potential and would have liked to see him as a demon, and the consequences of becoming one, for longer.
  • Too Cool to Live: Kyojuro Rengoku was one of the stronger Hashira (at least for someone without a mark), but he's the first to be killed after an impressive showing in the Mugen Train Arc. It says something that they're fondly remembered by the other characters for their heroism and strength.
  • Uncanny Valley: Something looks off with a number of eyes for female characters. Some like Nezuko are relatively fine, but others like Kanao and Mitsuri look like their stuck in a Thousand-Yard Stare thanks to having large eyes but small pupils. As a result, when they get focused on, it can be unnveriving to some because they look lifeless or like dolls. A few male characters have this issue too, but the majority of male characters have mostly normal looking eyes.
  • Unintentionally Unsympathetic: The series loves to use the Tragic Monster and Alas, Poor Villain tropes so much for almost every single Demon that the heroes face to try and make you see the Demons as people who were victims as well, but rarely do the Demons actually feel like they are deserving of sympathy for some viewers. Many of the Demons this happens to do have tragic pasts, and some may have been turned against their will, but the fact they prey on innocent humans, all while never acknowledging that they are contributing to the reason humans may want to hunt them down, makes it hard to find the majority of the Demons in the setting tragic, and the series never introduces a Demon the heroes fight that truly feels deserving of sorrow from the audience since their current actions are so monstrous. While it makes sense Tanjiro would feel empathy for them, due to his connection to Nezuko and desire to turn her back to normal, the series beats the audience over the head so often that it comes across as hard to ignore for some.
  • 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. Despite this, he's still very popular among the fandom, once scoring second place in an official poll only behind the loved-by-all protagonist Tanjiro himself. His popularity proved to be long lasting; the second official manga poll in Japan crowned Zenitsu with first place in 2020. 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. He's so popular, in fact, that he appeared in another character poll...for The Promised Neverland, another Shonen Jump series.
  • 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.
    • Enmu is often confused as female.
    • Those who've seen Muichirou first in the manga might mistaken him as female.
  • Visual Effects of Awesome:
    • While not quite at the level of ufotable's Fate adaptations in an average episode, there are still plenty of scenes with beautiful visuals and outstanding animation. Episode 19 was so impressive that it set the anime fandom aflame and interest in the show exploded. Mostly for this scene, but with plenty more in the episode beyond it.
    • CyberConnect2's Tie in Game manages to look even better than the Anime, especially during the Ultimate Moves. Not surprising, as they have done similar with other anime tie ins since Naruto: Ultimate Ninja Storm, including Dragon Ball Z: Kakarot.
  • What Do You Mean, It's for Kids?: Despite being very violent and gory at times (with the plot being kicked off when Tanjiro comes home to find almost all of his family murdered), and having an entire arc that involves infiltrating a red light district, it's a Shonen Jump title, so it's aimed at a preteen and teen male audience. It's also somehow managed to become popular with Japanese children who are even younger than the intended demographic, though there was still some concern from parents over whether or not the Mugen Train movie was appropriate for young children. Mugen Train was outright given an R rating for its North American release, as opposed to its PG-12 rating in Japan (roughly analogous to a North American PG-13 rating).
  • The Woobie: Lots of demons have tragic backstories but Spider Mother's is one of the worst. She is implied to have had a sweetheart when she was human, and that he died violently. As a demon, she is forced into the role of "mother" for Rui's "family," and suffers textbook domestic abuse at the hands of Spider Father. When Rui says she is not killing the demon slayers quickly enough, she panics, begs him not to tell Spider Father, and tries harder to kill Tanjiro and Inosuke. We never see her eat humans or even express interest in doing so, and thus we are left wondering if she's just as much a victimized puppet as the humans caught in her web. She surrenders as soon as Tanjiro reaches her, who thinks that she reeks of fear and suffering.

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