YMMV / Demon Slayer: Kimetsu no Yaiba

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The following have their own pages:

• Ensemble Darkhorse
• Fan Nickname
• Memetic Mutation
• They Wasted A Perfectly Good Character

Other examples:

A-C

• Alternative Character Interpretation:
  • Shinobu tells Big Sister Spider that she would be willing to spare her life, if the demon were willing to undergo a prolonged torture session as penance for the countless lives she has taken. The demon immediately lashes out in anger, so we do not get to see what would have happened if she had accepted. Is Shinobu simply someone who loves to see the faint glimmer of hope in the eyes of her hated enemies slowly die? Or is this a completely genuine, if very twisted, attempt to honor the wishes of her deceased sister? Her willingness to give Nezuko a chance might imply the latter.
  • Was it actually cowardly of Akaza to flee from the sunlight after killing Rengoku, or was he fully within his right to flee from his Achilles' Heel? Fans with a negative opinion of Akaza believe the former, while those with a positive opinion believe the latter.
  • Did Muzan kill the Lower Ranks because of their High Turnover Rate alone, or did it have to do with their moral character? Mukago tried to deny her own cowardice when it was pointless to do so because Muzan read her mind anyway, Wakuraba tried to run away from a location he was unfamiliar with and that he knew was controlled by Nakime's blood demon art, and Rokuro tried to ask for more blood from Muzan, implying he could do better with assistance instead of by his own merit. It becomes clear that they are cowardly fools without the power or potential to compensate for it, something Muzan had no tolerance for. This also might be why he spared Kyogai, because he was actually willing to try harder to regain his position.
• Alternate Self Shipping: Hantengu's Kidoairaku clones are sometimes shipped with each other, although depending on how you view their relation with each other, this can also be viewed as Incest Yay.
• Americans Hate Tingle: Zenitsu is much more divisive in the West than in his home country, with quite a few fans finding his constant screaming annoying and his attitude towards girls to be creepy.
• Angst? What Angst?: Due to being essentially lobotomized when transforming into a demon, Nezuko doesn't fully remember witnessing her family's murder at the hands of Muzan. That is until she turns back into a human and it all comes back to her, as Nezuko recalls her thought process as a demon was extremely infant-like, having an innate dislike for violent demons by subconsciously tracing her rage to back when Muzan killed her family.
• Ass Pull:
  • 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, 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 seemingly hearing her mother's voice, and, without any prior hinting or setup, reveals her Blood Art by saving 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".
  • Inosuke surviving Gyutaro impaling him in the heart by shifting his internal organs. Not only was this ability not mentioned before (though not entirely out of nowhere for someone like him), but Gyutaro got Inosuke by complete surprise while he was carrying Daki's head.
  • At the end of the Swordsmith Village arc, Nezuko becomes immune to the Sun. The problem with this is the audience clearly gets to see her start to disintegrate as she's exposed to the Sun, and there's even a Good-Times Montage to make us think that she's going to die. Her final gesture towards Tanjiro suggests that she's prepared to Face Death with Dignity. The reveal that the Blue Spider Lily which can make one immune to the Sun grows close to the Kamado household which might explain how this was possible doesn't happen until the story's epilogue.
  • 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.
• Award Snub: Despite Mugen Train being the highest-grossing anime film ever and the highest-grossing animated film of 2020 (and eventually the highest-grossing film of 2020 period), it wasn't even nominated for Best Animated Feature at the 93rd Academy Awards. Fans were incensed, though not surprised given the Academy's general apathy toward anime films.
• Awesome Ego:
  • Inosuke is extremely unhinged and prideful in battle up to the point where he hates having to ask for help, yet his great fighting prowess and absolute refusal to back down from a fight makes him very beloved by fans. It also helps that his overconfidence can be quite humorous at times.
  • Tengen Uzui has a rather large ego, being convinced that he's a literal "god of flashiness and festivals", however he has such a large amount of skill and flair as a Hashira that it almost comes across as believable.
• 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 are when he is in a sleep-like trance. His self-righteous nature, especially when it comes to girls, doesn't help either. 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 loud and cowardly, he has never given into it, or abandoned anyone to demons like other cowardly characters. His competence in the final battle somewhat helped improve his image amongst detractors, however there are still some who dislike him.
  • To a lesser extent, Inosuke. While plenty of fans love him for being a Crazy Is Cool Blood Knight, there's a small portion of the fanbase who find him quite annoying, find his voice grating, and believe he doesn't contribute much to the series besides being wacky comic relief. It doesn't help that he we don't see any of his backstory until the very final arc.
  • 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, but others find him to be a generic and bland main antagonist whose type is a dime-a-dozen in shonen manga, and whose lack of redeeming qualities makes him uninteresting compared to other supporting antagonists with a better background. The final battle against him being underwhelming to many fans compared to the battles with the Upper Ranks doesn't help.
  • Kagaya. Some find him a likable and wise leader who cares deeply for his subordinates while others find him to be an almost delusional Knight Templar who is responsible for getting many of his subordinates needlessly killed, as well as his own family, and is willing to do absolutely anything to defeat his archenemy Muzan.
  • Suma. Some find her characterization as a Brainless Beauty with Hidden Depths endearing and see her as attractive due to her very visible cleavage, while others find her constant crying and high pitched voice just grating to listen to.
  • Hotaru Haganezuka. While he is a Memetic Badass among the fandom for his fiery temper when it comes to his passion, a small portion of the fandom finds him to be a gag character whose gimmick has gone dry and is now just obnoxious. Not helped by the fact that he seems to prioritize honing Yorichii's sword over saving the Swordsmith's village.
• 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.
  • The ufotable anime adaptation of the arc (Season 2), by contrast, noticeably employs a significant amount of Cliffhangers for much of the fight (S3 E6 onwards), presumably to pace it a bit more justifiably. Based on how it climaxed (at S3 E10) and how well it was received by reviewers and and audiences, it seems to have worked.
• Bishōnen Jump Syndrome: Following some of its admitted inspirations: Bleach and Jojos Bizarre Adventure, the series is filled to the brim with all sorts of attractive male archetypes, ensuring any fan to easily find one of their liking, which contributed to the series' early humble manga-only popularity already being quite female populated, before the anime kick-started the series to a Multiple Demographic Appeal phenomenon. All officially endorsed popularity polls in Japan are a testament of how women dominate the most fervorous side of the fandom; the top ranked characters are some of the prettiest boys, with female characters consistently ranking lower than them.
• Broken Base:
  • Word of God states that when the Demon Slayers use their breathing techniques to conjure elements with their swordplay it's really just a visual feature, that there are no real tangible elements being made. Many among the fanbase found this explanation very jarring and dissatisfying. Those same fans say such concepts do not sound out of place in a universe where actual demons exist and can perform blood magic.
  • In typical anime fan fashion, the battle for sub vs dub is present for this show. While most fans find the dub serviceable, others find it weak in comparison to the original Japanese version, while others argue that the dub actually surpasses the sub in some scenes. Opinions can change though, see He Really Can Act.
• Catharsis Factor:
  • In general, not unlike That One Boss in video games, most of the demons fought take a lot of effort to put down even for Hashira, to the point that their surviving certain attacks, such as Rui's infamous "I cut my head off first" trick, can seem like Ass Pulls at times. This, combined with how most of them tend to be cruel Smug Snakes, can make the moments when they're finally defeated extremely satisfying, even when Alas, Poor Villain is in play.
  • While it's at the expense of her temporarily losing control and nearly attacking a human, seeing Nezuko beat the ever-loving crap out of Daki is extremely satisfying, considering what a Smug Alpha Bitch she's been up to that point.
  • After the heartbreaking scene of Nezuko being exposed to the sun causing her to burn in agony, forcing her to make a Heroic Sacrifice so a panicked Tanjiro can save some villagers Urami is chasing, an enraged Tanjiro gives the cowardly Hantengu his just desserts and beheads him. Not only that, but Hantengu's human past where he's revealed to be a con artist and serial killer who blames his own hands of all things, makes it all the more satisfying.
  • Zenitsu finally standing up to Kaigaku and then cutting off his head is very satisfying as not only did he just sell out the Demon Slayer Corps and become a demon just to save his own hide, but it also resulted in their master committing suicide out of guilt. Kaigaku even has the nerve to taunt Zenitsu about it. The only people who are complaining about Kaigaku's death are the ones who thought he got off easy.
  • After he has committed atrocity after atrocity and been responsible for every single horrible thing in the series, seeing Muzan Kibutsuji finally be killed by the combined efforts of the Demon Slayer Corps and Tamayo is too satisfying for words. Muzan's evil spirit pathetically begging Tanjiro not to leave him only to be Dragged Off to Hell is just the icing on the cake.
• Common Knowledge: Sumi, Kiyo, and Naho, the three little girls who work at the Butterfly Estate, are frequently thought to be triplet sisters. However, they are not related (since they all have different family names), and just happen to look very similar and be roughly the same age.
• 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 in front of his enemies. 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 several of his top 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.
  • "Mugen Train" arc: Enmu is Lower Rank 1 and a suffering-addicted psychopath. As a human, Enmu claimed to be a doctor, falsely "curing" the dying for his own profit and prestige until being made into a demon by Muzan. Insanely worshipful of Muzan, Enmu swiftly kills to climb the ranks of the demons and even survives Muzan's purge of the Lower Ranks by impressing his master with his love of pain and death. Empowered and sent after Tanjiro, Enmu uses his powers over dream and sleep to put Tanjiro and his friends into pleasant dreams 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 further empower himself.
  • "Swordsmith Village" arc: 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.
  • "Sunrise Countdown" arc's 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.
• Continuity Lock-Out: Consuming the Kimetsu Gakuen/Slayer Academy spin-off is a daunting task in its original published format, since its contents are produced in a very spread-out capacity, different magazines, different publications between manga, light novel and even databooks. The anime makes it easier to consume through being post-episode extras, until the Valentine's Day arc that was originally a stream-only event. However, knowing the deeper details of many characters and their motivations is a hard task for people in places where both Fanbooks (Databooks) are not officially available. Furthermore, the anime staff is treating the Fanbooks in a negligible manner when adapting scenes for the show. Lastly, the Koyoharu Gotouge Exibition, a 2021 art exhibition which took place in Japan, had the series author reveal some new details about the series' epilogue through art pieces and articles; if one didn't physically attend and take pictures, such new info is likely out of reach for them.
• Crazy Is Cool: Inosuke, in spades. For starters, he wears the head of a boar over his face and is seen constantly shirtless while Dual Wielding two demon-slaying swords. His enthusiastic Blood Knight personality and absolutely crazy fighting style cement him as this.
• Creepy Awesome:
  • Several of the demons in the series can count as this. Muzan, Doma, Enmu, Gyokko, Kokushibo, and Rui are all good examples.
  • Shinobu definitely qualifies. She's generally nice and pleasant, but has a certain Dissonant Serenity attitude towards about everything (later revealed to be because of the death of her sister) and even acts cheerful towards demons, right before brutally killing them with poison.
• Critical Dissonance: Demon Slayer: Kimetsu no Yaiba faces criticism from anime critics and the more hardcore side of the anime fandom in contrast to mainstream audiences. While Demon Slayer is perhaps one of the most successful anime franchises in the late 2010s/early 2020s where mainstream audiences praise it mainly due to its themes, action sequences and especially the animation, many critics and hardcore anime fans believe that when one looks past the manga's unique art and the anime's high production values, it's really an average battle shonen series with a simplistic storyline and out-of-place comedy (with sidekicks whom some may not tolerate), which clashes with its serious tones and graphic violence.
• Crosses the Line Twice:
  • The Brother Spider transforming Zenitsu into a spider? Horrifying. Zenitsu screaming his lungs out nonstop in an extremely over-the-top fashion, causing the Brother Spider to wonder how he managed to become a Demon Slayer in the first place? Hilarious.
  • As listed under Narm, the one unnamed Demon Slayer getting killed near-instantly by Rui after displaying a legendary amount of stupid arrogance can definitely be this if you're into Black Comedy.
  • 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.
• Cry for the Devil: Many of the demons in the series. They're man-eating monsters, but at one point in time they were normal human beings who, at their lowest point in life, were tempted onto the path of darkness by Muzan. Honestly, it might be easier to list the demons who aren't sympathetic in some way: Muzan himself, Doma, Enmu, Gyokko, Hantengu, the Snake Demon, and Kaigaku. Even the first two had tragic backstories until they became too evil to be excused.
  • This especially applies to Akaza due to the horrific Trauma Conga Line he had went through prior to becoming a demon. Due to being poor, he resorted to stealing in order to afford the medicine for his sick father, before the latter committed suicide to save his son from a life of crime. Afterwards he was taken in by a dojo instructor as his disciple and started taking care of his daughter Koyuki, whom he fell in love with. Unfortunately while he was away, both the instructor and Koyuki were poisoned by the members of the rival dojo, causing him to snap and massacre them with his bare hands. Muzan learned of this incident and then forcibly made him into a demon. And unlike other demons in the series, Akaza chooses to die upon recalling his deceased loved ones in order to reunite with them while acknowloging Tanjiro - who he had previously deemed weak - as a Worthy Opponent.

D-H

• Diagnosed by the Audience:
  • Hotaru Haganezuka could very well likely be on the autism spectrum. Case-in-point, he's a 37-year old man who has No Social Skills (as the other swordsmiths can attest to it) and goes on insane outbursts when even the tiniest chip happens in one of his swords (which is probably why he has very few customers aside from Tanjiro Kamado who is extremely patient with him). If that's not all, he is overly dedicated to his job, to the point where he's still focused on forging Yorichii's old blade, even though an Upper Moon like Gyokko is attacking him!
  • Zenitsu Agatsuma's tendency to have extreme mood swings, get overdramatic (especially concerning his cowardice), and his desperation to get a girl's attention are clear signs he either has massive anxiety issues, or also has a form of bipolar disorder. It's very apparent when his cowardice actually hinders his true potential, which is explicitly shown through some form of "sleepwalking."
  • Inosuke Hashibura being a Wild Child with an impulsive berserker attitude that forgets societal norms and even goes through a sensory overload when encounter mass amounts of people in the Yoshiwara District are implications he has ADHD and autism. Even other characters like Goto think something is very off about him. It's also worth noting he was raised by boars, so that very likely could've also played a part in his lack of social skills or awareness.
  • Kyojuro Rengoku might also be on the spectrum as well. He's overly cheerful and enthusiastic, to the point where he comes off a little insensitive concerning his demeanor when declaring Tanjiro and Nezuko should be executed. If that's not all, his sense of justice is very much flanderized and he's overreacting to a tasty meal he bought after saving a couple civilians from the slasher demon. Even Tanjiro thinks something is quite odd about him, before doubling it down stating he has a good heart.
  • Giyu Tomioka's aloof and distant personality could very well be signs of clinical depression, especially when considering his Dark and Troubled Past. He's rarely shown to smile, is always distant from his fellow Hashiras (with the slight exception of Shinobu), and has low self-esteem of his skills as a Demon Slayer.
  • Sanemi Shinazugawa's hotheaded personality and over-the-top hatred of demons (to the point where he is straight up sadistic when stabbing a helpless Nezuko multiple times, as well as tempting her to take a bit of his bloodied arm) are implications that he might have PTED (Post Traumatic Embitterment Disorder). After all, he did have a traumatic past being forced to kill his demonized mother after she slaughters his younger siblings (sans Genya) and again watching his Best Friend Masachika Kumeno die from injuries sustained during their battle against Ubume.
  • Kanao Tsuyuri's inability to make decisions for herself prior to her encounter with Tanjiro is a prime example of Aboulomania, a disorder that is characterized by great indecision and an inability to, or difficulty in, making any kind of choice in a person's daily life.
  • While Doma is certainly evil to the core, he also has Moral Agency Issues, as Kanao can implicitly attest to, in addition to Doma all of a sudden having genuine feelings for Shinobu even though he doesn't regret his actions. These are clear signs of psychopathy and antisocial personality disorder, which are lack of empathy, remorse, or concern for moral principles.
  • Genya is thought by some to have asthma or another type of lung disease, mostly because it's a more logical and satisfying explanation for his inability to use breathing styles than what is provided.
• Draco in Leather Pants:
  • Doma gets this quite a bit from fans, mostly thanks to his appearance and cheerful personality, with some even claiming that if it weren't for his parents, he would have grown up to be a perfectly sane and normal human being. This disregards the fact that Doma is portrayed as always having had sociopathic tendencies, with him not caring one bit about his mother killing his father and then herself right in front of him. And while he does seem a tiny bit upset that he can't display any real human emotions, he doesn't seem to care that much and is perfectly content to keep killing and eating women. Most of these fans like to ship him with either Kotoha or Shinobu, often portraying them as something of a Morality Pet towards him, despite the fact that he ended up killing both of them.
  • Many fanworks depicting the relationship between Zenitsu and Kaigaku before his demonization often downplay, if not erase, the latter's negative qualities.
  • Muzan also gets this, thanks to his appearance. Some fans go so far as to ship him with Tanjiro.
  • Kyogo Shinazugawa is the most odd one out in this regard, the only claim to this character's name was that he was often beating his wife and kids when he was alive, yet quite a bit of Japanese fanart of him and Shizu Shinazugawa being a "cute couple" can be found.
• Ending Fatigue: While the bulk of the Infinity Castle arc was 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 for 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.
• 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 Cool:
  • Akaza is an Affably Evil Blood Knight who gets some of the best fight scenes in the entire series. His tragic backstory also helps.
  • Kokushibo is The Dragon to Muzan Kibutsuji and a Master Swordsman with a Creepy Awesome design, as well as an interesting past with his brother, Yoriichi Tsugikuni.
  • Doma gets this as well due to his Laughably Evil moments in contrast to other demons in the series and cheerful personality that serves to conceal his true lack of emotion.
  • Muzan Kibutsuji himself, despite clearly being written as a monstrous Hate Sink, has some fans thanks to being an extremely powerful and mysterious Evil Overlord with a tendency to wear nice suits and very much resembles the late Michael Jackson.
  • Really any moon is guaranteed to have their fans who think they're cool thanks to their unique looks and powers, such as Gyutaro, Gyokko, Hantengu's clones, Rui, and Enmu.
• Fan-Disliked Explanation:
  • Quite a few fans prefer to ignore the official statement that the Total Concentration Breathing techniques only use Elemental Motifs and their elemental effects are only symbolic of the elements they represent, rather than being actual Elemental Powers. The techniques already involve blatantly superhuman feats such as cutting through boulders and moving at mach speeds, so those who reject this statement think that it doesn't serve the purpose of making the fights more realistic, and just makes them not as cool, especially since demons do have explicitly magical abilities in their Demon Blood Arts.
  • On a more minor note, a small section of fans were dissatisfied with the reveal that Yorichii was not only not Tanjuro in his prime, but not even an actual Kamado, finding the explanation that his resemblance to Tanjuro was mere coincidence lacking and an unnecessary Red Herring.
• 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 and with Jujutsu Kaisen with the two fandoms frequently arguing on who has the superior story and characters.
• Fandom-Enraging Misconception:
  • Fans who have read the manga get dismayed when people who have only watched the anime mistake Yoriichi as being Tanjuro Kamado, but are usually a bit more lenient as they have very similar appearances and that was possibly a purposeful Red Herring by Gotouge. But they react with a bit more annoyance when they mistake Sumiyoshi and Tanjuro when the two look nothing alike, resembling Tanjiro more than his late father. They become rather sore when fans somehow mistake or theorize that the 480-year-old, six-eyed, Kokushibo is Tanjiro's father, when that makes even less sense than the former two assumptions.
  • In addition, a lot of fans who have read the entirety of the manga don't react well to Akaza, Sanemi, or Iguro being treated as Hate Sink characters, and eagerly wait for their backstories to be animated.
  • Gyokko is often perceived as being weak by fans due to how easily he was defeated and killed by a Demon Slayer Mark enhanced Muichiro. Other fans don't take kindly to this and often correct them stating that Gyokko is immensely dangerous and powerful, just arrogant, and that demon slayers who have awakened their mark are just THAT strong.
• Fandom-Specific Plot:
  • Many fics do a RoleSwapAU 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.
  • Similarly, another Role Swap AU, that can sometimes overlap with the previous, portrays the Hashira and other humans as demons, while the Twelve Kizuki and other lesser demons become Demon Slayers, with the Upper Ranks in particular being Hashiras.
  • Sabito lives AU's started to pop around after the Manga elaborated on Giyu's relationship with Sabito. Sometimes, Makomo is also included to be alive in this AU. Both often being seen with Giyu and Tanjiro to form quadruple Water Breathing users.
  • Tanjiro remaining a demon AU have begun popping up after Chapter 202.
• Fanfic Fuel:
  • A color spread by the author depicting the 4 main characters swapped with each other's outfits◊ has spawned numerous What If? stories and fanart of Nezuko being the swordswoman to Tanjiro's kind demon.
  • The Kimetsu Academy High School A.U. 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◊.
• Fanon: The last manga volume was released in December 2020, Japan, and even after a 2nd Databook got released in 2021 some character backgrounds remained with some unexplained details, with that some fans assume certain things:
  • The setting introduced the fact demons can use a system called Blood Battle Succession to challenge Twelve Kizuki members for their spot or become higher ranked, however, no demon is specifically stated to have made use of it, yet Doma was once the Upper-6 in the past, now he is the Upper-2; fans assume Doma actually challenged Akaza for the spot since Muzan created the Twelve Kizuki with Akaza as a member from the get go, making Upper-1 Kokushibo some company, adding to the fact Akaza had a huge grudge against Doma for being the Upper-2 despite he being older than the cult leader.
  • Tanjiro's father, Tanjuro's, actual cause of death is never revealed, it is just some unspecified illness that took him 1 year before the story began. As the series goes on a certain power called Demon Slayer Mark is revealed, coupled with Tanjiro suspecting his father had a birth mark under his scar, it is later explained by Kokushibo who lived in the prime era of Marked slayers that all Marked ones die once they reach 25 years of age, no exceptions beyond his borderline divine younger twin brother Yoriichi; Tanjuro's age at death is not revealed, but his very weakened appearance while still performing Breathing arts in Hinokami rituals could be the example of a dying Marked person.
  • The series never gives an exact date to when the events in the story unfold, just that it is set in the Taisho Period of Japanese history, which was from 1912 to 1926. However, when the anime covered the Red-Light District arc and added a detail that didn't exist in the manga, the fires in the fallout of the final Upper-6 battle, it made some fans link that detail to the real historical event in Japan where the very same Yoshiwara Red-Light District caught fire in 1913; thus this could potentially give the series an exact date to exactly when the story takes place.
  • Fans often chalk up Sumi, Naho, and Kiyo scribbly dot eyes to be prepubescent features, that will blossom into more typical eyes with age.
  • Although the mother of Tengen's child is never revealed, Hinatsuru is usually portrayed as the wife that Tengen impregnated, as she is already the Team Mom of the 3 wives, as well as being the most mature and the one that Tengen is closest too.
  • Regarding demons or other characters with unknown last names, fans sometimes adopt the surnames of their Kimetsu Academy counterparts as their actual surnames. For example: Gyutaro and Ume Shabana, Enmu Tamio, Yushiro Yamamoto.
• 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 himself 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 held 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.
  • In addition, Mitsuri is sometimes shipped with Zohakuten mainly due to the gimmick of the Love Hashira being in a relationship with the embodiment of Hantengu's Hatred.
• 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. Word of God has explicitly stated Jojo to have been an influence on the series among various others.
  • 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).
• 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. 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, and 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:
  • Right before his death, Kyojuro tells Tanjiro that he has faith that he'll become the next Hashira. Filled with determination and grief, Tanjiro later vowed to Senjuro that he'll make good on this and one day become a Hashira. Genya also vows that he'll become a Hashira in order to reconcile with his older brother, with Tanjiro giving him words of encouragement. Unfortunately, Muzan is defeated and the Demon Slayer Corps are disbanded before any of that could come into fruition. Not like it would've mattered, as Genya dies in the Infinity Castle arc, and Tanjiro is left half-blind and with a crippled and emaciated left arm. Even if Tanjiro gets to live a happy life after the final battle, all these promises were ultimately in vain.
  • 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, when 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 out of Survivor Guilt. Considering that Shinobu, like Giyu, is also a victim of demon attacks and even she has an unhealthy way to cope with her pain, it comes instead as a mean-spirited remark from her despite her best intentions to break Giyu out from his shell. While the memes about this scene are still rolling, it somehow loses its levity after the readers finally learn Giyu's issues.
  • The Fandom-Specific Plot about Tanjiro being a demon becomes this after he becomes a Demon in Chapter 201. Complete with Muzan's memories.
  • On June 2022, Rui's English voice actor Billy Kametz, eventually succumbed to Stage IV colon cancer at the age of thirty-five. Rui's motivations throughout his appearance stemmed from him being ill since birth and his descent as demon happened because he wanted to be free from his illness.
• He Really Can Act:
  • When a trailer for Demon Slayer's dub was released, many fans commented their disapproval for Bryce Papenbrook's performance, thinking he sounded way to young and high-pitched to voice the Wild Child Inosuke. It was only until Inosuke had more of a speaking role that fans began to change their tune, and believe that he played the role well.
  • 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 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.
  • The same applies with Zach Aguilar's performance as the main lead Tanjiro. Many fans criticized it as being flat in comparison to Natsuki Hanae. But Mugen Train's English release began to change many people's opinions on it, particularly when Tanjiro yells at Akaza after he flees from the sun after punching a fatal wound in Rengoku's stomach. Many feel like Zach took the criticism to heart, and keeps improving his role.
  • While Ray Chase as Tengen Uzui and Brandon McInnis as Gyutaro were already held in high regard, many fans were especially impressed in the final fight scene they had in the dubbed version of "Never Give Up" finding them to really capture the rage and desperation the two had, as well as being a scene that actually surpasses the original Japanese version. It also helps that Ray Chase cracks his voice while yelling which does even more to sell the emotion.
• 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.
  • Fire-themed character Kyōjurō Rengoku is voiced by Satoshi Hino. A couple years later, Hino voiced Alvin Godfrey in Reign of the Seven Spellblades, a character Famed In-Story for his fire magic and who has the in-universe nickname "Purgatory"—"Rengoku" in Japanese.
• 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 Swordsmith Village Arc and 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.
  • On a similar note, Tanjiro kindness and benevolent attitude ends up effecting Muichiro in big way, that being inadvertently helping him regain his memories by reminding him of his late father's own kind personality. Because of that, Muichiro becomes a much happier and open person towards him, blatantly showing favoritism towards Tanjiro in the Hashira Training Arc, a dynamic that could be seen as Defrosting Ice Queen.
  • Some consider the strong admiration Uzui holds for Rengoku to be this. It's clear he liked and respected the Flame Hashira very much, to the point that he set a standard (saving lives) based on him and wished he could meet it.
  • 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 wound 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 associates Tanjiro with Yoriichi based solely on their physical similarities.
  • Gyokko is a demon with a very flamboyant voice provided by Kosuke Toriumi and Brent Mukai, and he also has a VERY deep adoration for Muzan, being visibly aroused after the King Of Demons beheads Gyokko to chastise him. In addition he straight up moans when his happens in the English dub.
  • Of a Les Yay variety, Mitsuri is shown to admire Shinobu when she attempts to talk Sanemi down from harming Nezuko inside her box during the Kamado siblings' trial, referring to her as "so cool". In addition they have very favorable views towards each other, with Mitsuri calling Shinobu beautiful, admiring her composure despite being younger, and expressing a desire to hang out with her, while Shinobu refers to as cute and cheerful. Then there's the extra illustration where Shinobu hands a flushed Mitsuri a hankerchief.
  • On the subject of Shinobu, there's this panel with her and Yae from the Giyu Gaiden.
  • While the two never met in the canon universe, Kanao and Daki develop an unlikely friendship in Chapter 26 of Kimetsu Gakuen. The chapter features the more stable Kanao helping the delinquent girl earn enough money for a music box she fancies, with the two becoming co-workers at a pizzeria. Daki even says she remembers Kanao's face because it's pretty, and she otherwise barely remembers her classmate's faces.
  • In chapter 23 of Kimetsu Gakuen, Gyokko tries to make an art piece and takes advice from the students. Koyuki suggests seeing fireworks and sharing it with someone he loves, as it would be 100 times better. Gyokko follows through on that and asks Hantengu to accompany him, deciding to share a fireworks show with him. Unfortunately, Hantengu does NOT reciprocate, summoning Zohakuten who accuses him of only thinking of himself.
• Hype Backlash: Due to gaining a huge fan following after Episode 19's climax, there are now plenty who have come to treat the series with disdain, claiming that said popularity is largely carried by the anime adaptation's high production values and it doesn't deserve the popularity it received; some people even claim that without the anime adaptation, the manga would've stayed in obscurity. Beyond that, the series' explosive rise in popularity during a short period of time resulted in a number of new viewers finding the show to not live up to said hype, especially in regard to the story and characters.

I-P

• I Knew It!:
  • Some people have predicted that Muzan would turn Tanjiro into a demon in Chapter 201.
  • Some also predicted the transformation won't be permanent, due to the manga ending announcement earlier.
• 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 Was His Sled: Due to the success of the movie as well as how beloved of a character he is in general, almost everyone knows that Rengoku dies at the end of the Mugen Train arc.
• 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's first season finishing its run), more people are starting to resent the series' rapid popularity. The fact that the manga's 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 visually unique or interesting lead to many feeling it only won or gets recognition because the show is popular.
• Jerkass Woobie: The demons as a rule are a Jerkass Woobie species with the exception of purely evil ones like Enmu or Muzan or the good ones like Nezuko. They were either murdered by or exploited at their lowest point by Muzan, who treats them like utter garbage and kills them for minor slights, and they don't really have any choice but to devour humans since it's the only way they can survive.
  • The Spider-Mother. She is greatly 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 ultimately allows herself to be killed as soon as Tanjiro reaches her, who thinks that she reeks of fear and suffering.
  • Rui. The Domestic Abuse he inflicts on his fake "family" is horrific but it's out of a genuine desire to have the family he never thought he had. Back when he was human, he was a sick child whose parents asked a doctor (actually Muzan) to grant him a strong body, turning him into a demon as a result. Realizing their mistake, his parents planned to kill him, then themselves, but Rui felt betrayed and killed them first, with his parents' last words being an apology for not giving him a strong body. It's only in his last moments that he remembers it. Realizing his parents truly loved him all along, he regrets that his evil deeds will lead him to Hell, away from his parents. Fortunately for him, he's reunited with them in Hell.
• Jerks Are Worse Than Villains:
  • Although Muzan is the Big Bad and presented as Hate Sink for being the creator of all demon-kind, allowing various tragedies over the course of the series to happen, and even personally killing Tanjiro's family, he still tends to get a bit less hate compared to Kaigaku, a Jerkass demon slayer and a Big Brother Bully to Zenitsu despite the latter's admiration towards him. This sentiment increased ten-fold when he betrayed the Demon Slayer Corps and became a demon just to save his own life and mocked his master for committing suicide out of shame and despair at his actions.
  • The unnamed suitor who rudely rejected Mitsuri and caused her complex is among the most hated character in the series. It's especially common for fanarts and memes to depict Iguro or Mitsuri's father to beat him up over it.
• 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.
• Like You Would Really Do It:
  • After Rengoku's death at the end of the Mugen Train arc, fans were worried that Tengen was going to meet the same fate, especially with the heavy amounts of damage he suffered at the hands of Gyutaro. However, their fears quickly subsided when Tengen attempting to give his final words became a comical scene of his wives bickering. Sure enough, he survived.
  • Nezuko kicking away Tanjiro, who was shielding her body from the sun, so he can finish off Hantengu at the end of the Swordsmith Village arc. Given how central the character is to the whole story's premise, it's obvious that some plot twist will allow her to survive somehow, even though Tanjiro is initially certain that she's dead. And sure enough, Nezuko not only gains immunity to sunlight, but also regains the ability to speak.
• Love to Hate:
  • Muzan Kibutsuji. He may be a horrifically vile Evil Overlord and Complete Monster, but he can make for a very effective Big Bad.
  • 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.
  • Kaigaku. He's such an irredeemable and loathsome Jerkass who betrays the Demon Slayer Corps just to save his own hide that the near-universal hatred for him ironically loops around into making him popular.
• 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, forgoing a chance to kill his opponents to commit suicide and reunite with his family.
• Memetic Badass:
  • Haganezuka, thanks to the Running Gag of him viciously chasing after and trying to "kill" Tanjiro with a knife for constantly breaking his swords, in one instance chasing after him all the way from sunset to sunrise. Several jokes have been made as a result that, if somebody told Haganezuka that Muzan and/or the Twelve Kizuki broke Tanjiro's sword, all of them would end up dead.
  • Murata, although unlike Haganezuka, it's completely ironic. In-universe, Murata is a purely comic relief character who although not weak, is a rather unimpressive demon-slayer. However, he is jokingly referred to as the most powerful demon slayer either for pure ironic comedy, or in reference to him surviving hellish arcs such as Mount Natagumo and the Infinity Castle, and living towards the end of the story, pre-timskip that is. Especially in a series where non-descript demon slayers are usually nothing more than Red Shirts.
• Memetic Loser:
  • Zenitsu has been a target of much fan mockery due to his creepy obsession with girls, tendency to scream his lungs out at the slightest provocation, begging to be saved whenever a demon is around (even if he outgrows it later), and being the butt of several jokes. The fact that all these traits are on display in his official introduction scene doesn't help.
  • Poor, poor Giyu. 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 Giyu cosplayers. This has also leaked into advertising — there have been sightings of Giyu posters set up separate from those of the rest of the Hashira, intentional or otherwise.
  • Muzan Kibutsuji, thanks to his massive Pride basically causing him to dig his own grave. His Bad Boss and Dirty Coward tendencies tend to be seen as the reason for his demise even more than the Demon Slayers. It doesn't help that he killed the one person who could have actually given him what he wanted a thousand years ago.
  • The one unnamed Demon Slayer who was brutally killed in less than a minute by Rui, after just bragging about how he could easily "climb up the ranks".
  • 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.
  • Gyokko is widely seen as this among the Upper Ranks due to being on the receiving end of a Curb-Stomp Battle by Muichiro and absolutely nothing being revealed about his past as he dies, unlike many of the other demons in the series. Muichiro basically trolling him the entire fight doesn't help.
  • More of a Memetic Weakling. Tengen's wives are sometimes ridiculed for their relative weakness in comparison to their husband, or other demon slayers. Not helped by the fact that their inferiority in strength is pointed out by Makio herself, and Hinatsuru having to rescued by the 3 main slayers after almost being killed by the Upper Six siblings, twice.
• Memetic Molester:
  • Muzan, mainly for looking a lot like a certain other Memetic Molester. The scene with Daki (who's around 13 mentally) lying her head on his lap as he sweet talks her is also rather easy to take out of context.
  • Tengen, due to having 3 beautiful wives and a much mocked scene where he smacks Aoi in the butt. Also, many fans have equated his whole operation in the red-light district alongside the main cast as an uncle taking his nephews to a whorehouse to "man them up".
• 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 fan artists feel like portraying her screwing around with other characters as intentional rather than an accidental consequence of her regressed child-like mental state.
• Moe:
  • You didn't think we'd leave out Nezuko, did you? She looks cute, has endearing love for her siblings, and even after becoming a demon, she doesn't lose her cuteness, regardless of whether she is snarling at someone, sleeping, or jumping to Tanjiro's aid, because 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.
  • Mitsuri is the Love Hashira and her reaction towards Nezuko makes anyone hug both of them. Her younger self is no slouch either with beady eyes, petite body, and her love and affection towards her father.
• Moral Event Horizon:
  • Muzan Kibutsuji 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 a 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 One Hit Kills 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.
  • Daki crossed this when she bullied and abused one of her servant girls to suicide, then murdered Omitsu (Kyogoku House's manager) when she confronted her over the matter.
  • Kaigaku selling out Himejima and his wards to Muzan, which resulted in many of his fellow orphans getting murdered, and Himejima himself nearly getting executed, all just to save his own sorry hide. If that supreme act of cowardace somehow didn't qualify him for this, then willingly becoming a demon when faced with death, driving his master, Kuwajima, to commit seppuku, and mocking his death to Zenitsu's face shows how truly vile and irredeemable he is.
  • Rui is a Tragic Villain with a hard-hitting Freudian Excuse, but even then, his crimes were too grotesque to earn him even a relatively merciful death. In an attempt to reconstruct his lost family, he acted as a Bad Samaritan to other demons, transforming them into warped parodies of 'parents' and 'siblings' regardless of their suitability (his current 'mother', for instance, is implied to be a preteen girl), and keeping them in line through horrific abuse until even the most moral of them would commit atrocities rather than risk his wrath.
  • In the anime, Rui's "older sister" sells out her "sister" demon when the latter tries to help them escape together. Rui then strings the other demon to the roof of their home and allows her to burn to death in the sunlight, and his "sister" doesn't bat an eye.
  • Hantengu was never sympathetic, but he crosses it with the revelation (admittedly All There in the Manual) that before becoming a demon, he not only was a con artist and a murderer, but he was responsible for murdering his wives and children in a fit of rage on multiple occasions.
  • Even though Akaza and Kokushibo where the Token Good Teammates of the Twelve Kizuki, mainly due to them not indulging in pure sadism too much, they were both willing henchmen of Muzan for centuries that mass murdered scores of people who's sole duty was to end the evil man that they served. Akaza even casually brags about his killing of past Hashira when fighting. Then there's Akaza's killing of Kyojuro and Kokushibo's killing of Muichiro and Genya.
• 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◊.
• Narm:
  • Although Muzan Kibutsuji is mostly a frightening and intimidating Big Bad, some American fans might find it a little harder to take him seriously upon realizing his original form looks like Michael Jackson.
  • In the Natagumo Mountain Arc, when Tanjiro confronts Rui, a random Demon Slayer cuts in and attempts to kill Rui while bragging about it, only to get sliced into pieces by him. Although it was meant to showcase how powerful Rui is as a member of the Lower Ranks, it instead ends up being hilarious due to how stupidly overconfident the Demon Slayer is and how quickly he gets killed.
  • Zenitsu's high-pitched and over-the-top screaming can sometimes ruin what's supposed to be a scary or unnerving scene. However, this might have been the point.
  • Some found Kyojuro Rengoku's death hard to take seriously due to Inosuke visibly crying through his headpiece while flailing his swords around like a madman.
  • Daki suddenly breaking down crying like a child after getting beheaded is such a severe Mood Whiplash it catches even Tengen by surprise, but it turns out it isn't inaccurate to her situation. However, the anime turns it into this because the crying sounds like a boiling tea kettle.
  • A miniature Hantengu fleeing from Genya and later Tanjiro is meant to be a high-speed, high-stakes chase scene, but Hantengu's flailing movements, ridiculous speed, and the fast paced pitter-patter sounds of his foot steps make it come across as a bit humorous for some.
• Narm Charm: As detailed under Ass Pull, Tanjiro suddenly remembering how to perform his father's fire dance to use it to fight Rui can come across as rather ridiculous, but due to how amazing the battle (and music) is, it's hard to find someone who doesn't absolutely love it.
• 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.
• Opinion Myopia: A large number of Western fans automatically assume that the presence of descendants from Giyu Tomioka and Sanemi Shinazugawa in the epilogue means that both must have had kids with a woman at some point after the final battle. However, many are shocked to find that Japanese customs regarding descendants allows a person to adopt a heir to succeed their house and family name in place of biologically having one with another person. In this way, a descendant of a person may not necessarily be their biological kid or even blood-related at all. The series' open ending does not explicitly mention whether both slayers actually had kids with another woman or adopted them; this has caused headaches to fans encountering this concept for the first time, and mild arguments between sections of the fanbase who argue in favor of marriage and kids or adoption.
• OT3:
  • The main trio Tanjiro x Zenitsu x Inosuke.
  • The top three Upper Ranks Kokushibo x Doma x Akaza.
  • Sumiyoshi x Suyako x Yoriichi.
  • The Kimetsu Gakuen versions of Yahaba, Susamaru, and Kaigaku.
• Paranoia Fuel: Demons working under Muzan are constantly walking on eggshells. The smallest failure or slightest contradiction of anything he says, intentional or not, results in immediate death for the individual. They aren't even safe in their thoughts, as Muzan is able to read their minds, something that Kamanue finds out the hard way.
• 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. 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 surprisingly significant number of Japanese children who are younger than the manga's targeted age demographic have become fans of the series. 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
  • Shinomitsu: Shinobu/Mitsuri
  • Inotan: Inosuke/Tanjiro
  • Tanzen: Tanjiro/Zenitsu
  • Inozen: Inosuke/Zenitsu
  • Sabigiyuu: Sabito/Giyu
  • Sanegiyuu: Sanemi/Giyu
  • Tangen: Tanjiro/Genya
  • Muitan: Muichiro/Tanjiro

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• Rescued from the Scrappy Heap:
  • Many fans had little love for Zenitsu in his introduction, due to his characterization as cowardly crybaby who screamed all the time. Especially in the anime due to Hiro Shimono and Aleks Le practically screaming their lungs out for extended periods of time, which got pretty obnoxious to those not familiar with his character. It's only until they see his Lovable Coward tendencies and badass side to him while he's a sleep that fans began to tolerate him as a part of the main cast. Sure enough, he's a fan favorite now, although he remains a Base-Breaking Character.
  • 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 up 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.
  • Shinjuro Rengoku. Fans found his badmouthing of his recently deceased son and physically assaulting both his youngest son and Tanjiro to be absolutely appalling and irredeemable. Some fans began to warm up to him however when he breaks down sobbing upon hearing the last words his eldest son left for him, although others thought it was too little too late. More fans changed their opinion on him when he apologized for his actions in a letter to Tanjiro, and revealed that his wife's death played a significant part in his downward spiral, and promised to improve himself.
  • Many fans hated Sanemi for infamously stabbing Nezuko and generally being abusive to both her and Tanjiro during the Kamado's sibling's trial, especially anime watchers with no knowledge of his backstory. Fans eventually warmed up to him upon learning about his incredibly traumatic backstory involving demons, his relationship to Genya, and his devotion to the Demon Slayer Corps.
  • On a similar note, Genya's was disliked at first due to him being characterized as little more than a violent thug with unjust anger issues, reminding some of a certain Base-Breaking Character from another anime. It would take him getting a Day Inthe Limelight episode, and him developing a genuine friendship with Tanjiro for that opinion to change, and he is know one of the most popular characters of the series.
  • Similarly, Akaza was loathed for killing Rengoku, and narrowly avoiding death by fleeing from the sunlight. It was only until his backstory was revealed that fans began to sympathize with him, especially in comparison to the other Upper Moons. Now he is a fan favorite, with many hoping for the day when his backstory becomes more widespread among the fandom.
• Self-Fanservice:
  • Many drawings depicting Hantengu prefer using his younger-looking, more attractive emotions, a lot of the time just drawing Zohakuten for simplicity. If they do include him, it's usually his smaller form hidden somewhere, as to not interfere with his hotter clones.
  • 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 creepiness, OR - especially in the case of the modern AU - making him Ugly Cute.
  • There are multiple fan arts of Gyokko in a human form, which depict him as a attractive if not colorful and slightly effeminate man.
  • A slightly humorous example where fan art of a genderbent Tanjiro depicts her as a cute action girl. This is what a genderbent Tanjiro would actually look like according to Gotouge.
• 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.
  • Giyu and Shinobu have multiple scenes together and interactions spread throughout the manga, Giyu's canonical spin-off manga, light novels, fanbooks, and databooks. Many fans are vocal about their love for the ship, to the point where much fanart and fanfiction stories of them exist. This was taken further after the second fanbook revealed that both enjoy talking to each other, according to Gyomei's observations, as well as their positive opinions of each other.
  • 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 rarely directly interact in the anime/manga, although Mitsuri thinks about Shinobu twice and affectionately calls her "Shinobu-chan" (as opposed to how she calls Iguro by his surname; though bear in mind it is easier to give such nicknames in Japan to people of the same gender since no romantic overtone is usually implied). Despite that, the pairing has a significant following among yuri shippers.
  • Sanemi Shinazugawa and Kanae Kocho have only interacted exactly once, in a flashback to when Sanemi became a Hashira and met Kagaya. However, fanart of them as a couple or romantically interested in each other can still be found, and things have only escalated further once the Kimetsu Gakuen universe showed Sanemi and Kanae, both teachers, interacting in the illustrated extras for Volume 18. Taken further after the second fanbook revealed that Sanemi likes Kanae, according to Gyomei's observations.
  • Kokushibo and Nakime have very little interaction, other than her summoning Upper Rank one first during the Upper Moon meeting. However, many fans pair them up due to both being cold, stoic, quiet, and as well as Muzan's most powerful minions. Fanartists usually portray them as either a phlegmatic goth couple, or Nakime having a crush on Kokushibo, breaking her Emotionless Girl personality.
  • The teenage girl who attempted to destroy Rengoku's spiritual core is often shipped with Enmu, likely due to being the "ringleader" of the 4 teenaged pawns after Enmu, as she tried to lead the failed assault on Tanjiro when he wakes up.
  • A small portion of the fandom ships Kiriya with Rei's daughter, solely due to the gimmick of a relationship between Kagaya's son and Muzan's "daughter".
• Signature Scene:
  • The ending fight of S1E19 (Tanjiro's desperate combat with Rui), 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 latter third of the Infinity Train Arc, the arrival of Upper-3 Akaza, his fight with Rengoku and Rengoku's death soon after. Unsurprisingly, it forms the emotional peak of the Infinity Train film adaptation (as well as its TV re-edit).
  • The Red Light District arc adaptation manages to get in here with S3 E10, the climax of the Demon Slayers' fight against Daki and Gyutaro—with everyone's Last Ditch Move being executed in an explosion of colors and Scenery Gorn—that audience reaction consensus being it equal, if not superior, to S1E19.
  • From the climax of the Swordsmith Village arc 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.
  • Another one from the manga: Tanjiro and Giyuu facing off against Akaza, and the reveal of Akaza's Dark and Troubled Past.
• Superlative Dubbing: The English Dub of Demon Slayer is excellent, with every character perfectly cast & voiced. Some stand-outs include: Zach Aguilar's Tanjiro,^note  who embodies the character's youthful idealism & humility while still being Good Is Not Soft Aleks Le's Zenitsu,^note  which some fans prefer over the original Japanese VA since they found the original version annoying at times Bryce Papenbrook's Inosuke,^note  embodying the character's Lovable Hot-Blooded Doofus persona as though he was born to play the role Abby Trott's Nezuko,^note  which is really impressive since it's a largely nonverbal role full of grunts & snarls Matthew Mercer's Kayaga, Erika Harlacher's Shinobu, Mark Whitten's Rengoku, Ray Chase's Tengen, Greg Chun's Muzan, etc. The list really goes on.
• They Changed It, Now It Sucks!: Some find Karaku's drastic voice difference in the English Dub to be too jarring and not fit his character.
• 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.
  • During the Upper Moon meeting, Kokushibo states that if one of the Twelve Kizuki wishes to improve their ranking, they can challenge their superiors to a Blood Battle between them. Demon vs. demon battles are exceptionally rare, and it would be interesting to see a fight between Akaza/Doma/Kokushibo or any of the Twelve Kizuki. Unfortunately, no demon in the story is shown getting their rank through a Blood Battle, with the closest depiction being the Databook stating that Akaza had lost a fight against Kokushibo but was spared as a reward for entertaining and gaining the respect of the Upper Moon 1.
• 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 he's fondly remembered by the other characters for his heroism and strength.
• Ugly Cute:
  • Gyutaro manages to be this for some, with a few hardcore fans even going so far as to regard him as ugly sexy. While he's quite hideous-looking under normal circumstances with his emaciated torso, clammy gray skin, and scarred face, the horrible life he's had gains him sympathy points and his fierce protectiveness of his younger sister Daki can come across as endearing despite him being a horrible influence on her.
  • A very small portion of the fandom consider Gyokko and Hantengu's default form to be this, the latter in particular for being able to shrink to a small size, and for coming across as a Jerkass Woobie to them. Some fan artists will tone down their grotesque features and draw them in a Pokemon-esque chibi style.
• Unintentionally Sympathetic:
  • Doma can qualify for some. Yes, he's a twisted sociopath, but some viewers may actually feel a little sorry for him since he seems rather upset of his inability to feel human emotions due to his parents treating him like a god and starting a cult around him just for power. And when he falls in love with Shinobu in the afterlife, he seems genuinely happy at finally being able to experience human emotions. However, it's lessened in that he still chooses to be evil even after this and doesn't seem to feel any remorse for his actions.
  • Enmu as well, as even though he's a Nightmare Fetishist, quite literally, the somber orchestral score that plays during his death makes some feel the slightest bit bad for him. That's the power of Demon Slayer's soundtrack.
• 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, primarily due to his cowardice and perversion. 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.
  • Doma is hated by almost everyone he's come across, albeit for good reason, with not even his fellow Upper Ranks liking him. However, he's one of the most popular demons in the series among fans for his Laughably Evil personality, with only Akaza really challenging him for the title of most popular demon in the series.
  • Giyu has very poor social skills, causing him to make very few friends, something lampshaded by Shinobu. However, he's one of the most popular Hashiras in the series, not only because he's the first we meet, but also because his close bond with Tanjiro, attractive looks, and stoic nature has earned him a lot of admirers.
• Vanilla Protagonist: While he's hardly disliked, many fans have pointed out that Tanjiro doesn't have much to his character beyond being a typical All-Loving Hero and Nice Guy who seeks to take down an Evil Overlord to avenge his family. Just compare him to the utterly frantic yet still friendly Zenitsu and the completely wild and rambunctious Inosuke.
• 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 mistaken for female until he starts speaking for a good long while.
  • Those who've seen Muichirou first in the manga might mistake him for a girl.
• 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 (the English localization calls it the Entertainment District Arc, but anyone familiar with Japanese terminology and history will know exactly what kind of "entertainment" is provided there even if nothing explicit is shown), 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).
• Woolseyism:
  • The French version's initial run of the manga was retitled Les Rôdeurs de la nuit, which translates to The Night Prowlers. Some people like that title better, as some feel Demon Slayer (which was adopted for the re-edition) is a rather generic title.
  • The ninth flame breathing style, Rengoku, obviously didn't really need to be translated, since it's named after its user. However, the Norwegian sub translated it into Skjærsild, a word most commonly translated as "Purgatory", but more accurately translates as "the fire that burns away sin". Very appropriate for a technique used to kill demons.

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