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* AbandonShipping: Saya and Tokizane ended up sunk [[spoiler:after it is revealed that Tokizane is a {{Jerkass}} who only joins the experiment just to get money and is disgusted by Saya's nature]].
* AlternativeCharacterInterpretation: Saya. All things being what they are [[spoiler: there is a lot of room for debate as far as her personality is concerned. Fumito seems to believe that she doesn't really give a hoot about humans, theorizing that she made a pact with somebody in a distant past to never kill humans. That having been said, in the last episode of the Anime, she still does try to save her "friend" Kanako even after it was revealed that the woman only wanted to use Saya for her own benefit. Also she does stop the massacre of the town fairly quickly--even though by then it was too late. Also she sheds a single tear for her friends and enters a HeroicBSOD that lasts for days. And in the movie she has multiple PetTheDog moments with various characters, though they are subtle and downplayed.]]
* AuthorsSavingThrow: People were complaining about Saya's incompetence in saving lives [[spoiler:until it's revealed that Fumito drugged her with coffee and marshmallows to suppress her abilities, personality and memories]].
* BigLippedAlligatorMoment: When Saya sings while going to school or home. And sometimes it's about her day, laundry or her dad. [[spoiler:Oddly enough, Fumito never reveals the reason for imposing this trait on Saya]].
* BrokenBase:
** By the first episode, the fans were already divided in camps between either ''Anime/BloodTheLastVampire'', ''Anime/BloodPlus'' and ''Blood-C'', debating on 'which' Saya they like the most and which story is better.
** Fans either considered the initial premise to be too formulaic (it's a series about a katana-wielding spirit hunter in a little mountain village, at least at first) or actually better than the MindScrew it was revealed to conceal.
** While CLAMP fans celebrated to see [[spoiler:Watanuki]] in this series (to the point it is often the only reason they watch it - see Just Here for Godzilla below), many believe that he feels shoehorned into ''Blood C'', as he does nothing for the plot, his desire with Saya ends up having no discernible weight, and his presence causes the series's setting to forcefully weld with [[spoiler:''Manga/{{xxxHOLiC}}'']], which is not an easy jive. This is reinforced for his apparition in the movie, in which all he does is giving Saya a new sword and looking important.
** The last two episodes really cause a more diverse response where some think that it's brilliant while others think that CLAMP has gone too far with their trademark ComplexityAddiction.
* CaptainObviousReveal: The commentators on NicoNico are dead right on [[spoiler:Fumito]] being the mastermind, that the whole town being [[spoiler:a set-up for his experiment]] and that [[spoiler:he's drugging Saya with coffee and marshmallows which results to her memory loss]]. Most of the viewers already figure this out by episode 8 due to him, [[spoiler:narrating with Saya in handcuffs as seen in the flashbacks]]. And when episode 11 rolls in, it doesn't come out as a surprise.
* CriticalBacklash: ''Blood-C'' was one of the most controversial and downvoted series in its heyday, being economically enough of a failure in Japan to propel CLAMP to a new dark age and basically causing the BrokenBase between ''Blood: The Last Vampire'', ''Blood+'' and the CLAMP fandom to join in their dislike for this new adaptation of their saga. However, specially after the release of the movie, which helped to fill many holes in the series and made many critics to change their mind, it's actually not rare to find recently reviewers who see it as not deserving all the hate it gets, among them newcomers to the saga and people familiarized with the [[Manga/{{xxxHOLiC}} writing]] [[Manga/TsubasaReservoirChronicle style]] of Nanase Ohkawa.
* CrowningMusicOfAwesome: Despite the show's mixed reputation, its soundtrack is still great all thanks to Naoki Sato. The best ones are [[https://www.youtube.com/watch?v=6i0zzngJgyM "Destiny"]] and [[https://www.youtube.com/watch?v=6i0zzngJgyM "A Price For The Winner, A Punishment For The Loser"]]. The opening and ending themes, "Spiral" by Dustz and "Junketsu Paradox" by Nana Mizuki herself, also deserve a mention.
* DarknessInducedAudienceApathy: By the end of show, the entire cast [[spoiler:are revealed to be actors who are requested by Fumito to play as Saya's friends and family for his experiments and most of them are actually assholes. You won't feel sorry for them when they're being slaughtered brutally]]. Saya herself is hard to root for since she's portrayed as a FailureHero who can't even protect civilians in the first place [[spoiler:despite that Fumito is responsible for hindering her true abilities. And with the whole town massacred, well, they're basically doomed already]].
* DorkAge: Kickstarted one for CLAMP, given the very mixed reception and low BD sales.
* EarWorm: "It is so nice outside today..." It doesn't help that Saya sings this tune ''a lot''.
* EnsembleDarkhorse:
** The Dog! A lot of people speculated that it's [[Manga/{{xxxHolic}} Kimihiro Watanuki]] due to his voice actors (both [[Creator/JunFukuyama Japanese]] and [[Creator/ToddHaberkorn English]]) and that he mentioned owning a shop where he grants wishes. And not to mention, the ONLY character who is on Saya's side and knows what the hell is going on.
** Nene and Nono were apparently popular enough to warrant a series of OVA shorts tying in with the movie, in which they are [[NoFourthWall fourth-wall breaking ghosts]] who give blackboard lessons recapping the characters, events and key elements from the anime.
* FandomRivalry: With ''Anime/BloodPlus'' fans, who regarded the series as the worst of the saga and that Saya Kisaragi is annoying and useless when it comes to saving lives. Likewise, ''Blood C'' fans who regarded Saya Otonashi as weak and dependable to Haji and usually gets her ass kicked. It also has a rivalry with fans of the [[Anime/BloodTheLastVampire original OVA]], who look down at both series as just plain bad spinoffs.
* {{Fanon}}: That the Elder Bairns are somehow related to (or, alternatively, ARE) the youkai from [[spoiler:Manga/{{xxxHOLiC}}]]. This is a common belief after learning of the connection among the two series.
* GeniusBonus:
** Anyone curious about the term "Shrovetide"? This is actually an obscure term from Catholicism that describes the beginning of Lent. According to the Catholic Encyclopedia, it is a time of "taking away the flesh". Of course, Catholics mean this figuratively, whereas this show obviously means it literally.
** Viewers unfamiliar with Japanese culture may be unaware that the "Elder Bairns" are actually based on {{Youkai}}. Look them up [[http://en.wikipedia.org/wiki/Y%C5%8Dkai here]] if you like.
* HarsherInHindsight: Saya's happy relationship with her father. She often sings how much she loves him. Creator/NanaMizuki's father died in 2008.
* HellIsThatNoise: Whenever a Elder Bairn eats someone...
* HilariousInHindsight: [[spoiler:Saya's life is being orchestrated as TrumanShowPlot and an experiment and everyone (except Saya, Fumito and Yuka) all die at the end in the hands of a wacky monster]]. Then, the 2012 movie, ''Film/TheCabinInTheWoods'', has the similar premise as well [[spoiler:which includes a guy being stabbed by an unicorn to boot!]]. Of course, the movie used to be shelved in 2009 before being released in 2012.
* JustHereForGodzilla: A huge part of the fandom is composed by CLAMP fans who came after hearing that [[spoiler:a post-''Kei'' Kimihiro Watanuki]] appears in it.
* LoveItOrHateIt:
** The general consensus among the viewers. There is no middle ground.
** Saya's little songs while walking to class are surprisingly divisive. People find them either terribly annoying or endearingly cute.
* MagnificentBastard: [[spoiler: Fumito. He not only orchestrated the entire TrumanShowPlot, controlling Saya, Tadayoshi, the Elder Bairns and all the cast members, but also predicted Kanako's betrayal.]]
* MemeticMolester: The commentators on NicoNico makes Fumito into this, saying that he likes drugging the coffee and also the Guimauve he gives to Saya. [[spoiler: After [[MindScrew Episode 11]] and [[DownerEnding 12]], [[IKnewIt and they were pretty much right]] about that...!]]
* MemeticMutation: [[DarknessInducedAudienceApathy Blood-C:]] [[SarcasmMode BEST COMEDY OF THE YEAR, MAN!]]
* {{Moe}}: Saya again. UpToEleven levels in the manga.
* MoralEventHorizon:
** Fumito showed his true colors when he had the main cast (except Yuka) and the rest of the civilians killed brutally. But shooting Saya in the eye and taunting her as he flees really sets the mark off.
** Episode 11 showed who [[spoiler:Kanako, Tokizane and the Monoe twins (the latter two who turned out be alive)]] are really in real life: they're assholes who don't care about Saya and they only played their roles for their selfish desires. Then, they taunted Saya for being a monster with [[spoiler:Kanoko]] forcing her to drink her own blood while [[HeroicBSOD she's in shock]].
** [[spoiler:Yuka]] doesn't give damn what is happening around her when she and Fumito are discussing her plans to be the Governor of Tokyo while the massacre is happening. And she definitely doesn't care about Saya, let alone looking at her with deep disgust.
* {{Narm}}:
** The gruesome yet creative ways used by the Elder Bairns to butcher peasants would be enough to elicit BlackComedy laughs by themselves, even without the bright chromatic palette of the series and the often weird character action which only make them more awkward.
** Episode 12. In two words: the Bunny Blender. [[spoiler: The whole town being slaughtered by the Elder Bairn, kind of loses its own bite, when the creatures doing it ''look'' like giant pink and cream rabbits with 'arms' as ears. Not to mention the bit where one stuffs a load of people into a giant bag, then another turns its hand into a blender-type thing. Would be horrific... if it didn't make a typical electric blender sound.]]
** [[spoiler: Nono and Nene's definitive deaths]] become ridiculous when you recall all of the {{Panty Shot}}s they have as they get [[spoiler: gruesomely slaughtered]]. It may have been intended as FanDisservice, but still...
** Some of the Elder Bairns designs (like the train car marshmallow Elder Bairns from Episode 3 and the mentioned [[spoiler:bunny Elder Bairns]] from Episode 12) looked cartoonish and campy compared to the other Elder Bairns designs which looked creepy and sinister-looking.
** As [[http://www.youtube.com/watch?v=Xx_Fy_L2IGY this]] video shows, many of the deaths are so over the top they cross the line from {{gorn}} and go straight into narm.
* NauseaFuel: Episode 9 and episode 12.
* NeverLiveItDown:
** Despite [[spoiler:Fumito's]] manipulations and the movie, Saya would always be seen by viewers as a FailureHero who couldn't protect people.
** The series can turn off a lot of viewers for its ridiculous and needless amount of gore. MoralGuardians or not, majority of the viewers would regarded the series as the one of the goriest and most violent anime competing the title with ''Anime/ElfenLied''. It doesn't help that on March 2015, the [[BannedInChina Chinese government started cracking down on violent and sexual-oriented animes shown in the internet]] and [[http://www.bbc.com/news/technology-32149754 cited]] ''Blood C'' as the No.1 example.
* ScapegoatCreator: CLAMP gets usually blamed by ''Blood'' franchise fans for tainting the series's plot with their characteristically controversial writing shenanigans. It got worse when it was leaked that Junichi Fujisaku, one of the pioneers of the saga, worked in ''Blood C'' only to direct the fight scenes, thus allegedly limiting his chances of getting the series right. Then it turned out in an [[http://www.animenewsnetwork.com/interview/2011-09-01/blood-c-tsutomu-mizushima-and-junichi-fujisaku/2 ANN interview]] that, while he certainly wasn't in charge of the screenplay, the series's story was outlined by himself before CLAMP, and more specifically, the controversial reinventing of the show was ''his'' own idea. Likewise,the director, Tsutomu Mizushima, got [[https://myanimelist.net/forum/?topicid=328275 a lot of backlash from detractors]] for the execution of the show, particularly on the extreme violence. Also, CLAMP altogether tends to be blamed, when it was actually only Nanase Ohkawa who was in the writing table.
* TheScrappy: Saya. In the first 4 episodes, a lot of people see her as a MarySue. This goes along with her singing (yes, we know that Nana Mizuki has a lovely voice, but for God's sake, do we really need her to sing about laundry or her dad?). Later, her failure to save people pretty much nails the mark. However, the last 2 episodes and the movie reverts this.
* SnarkBait:
** Watching this show on NicoNico Douga will result in tons of 'snarky' comments from members.
** 2ch and 4chan were just as snarky during the livestreams.
* SoBadItsGood: Even its detractors consider the series still fairly entertaining for being so soundly misguided in its attempt to be an adaptation of ''Anime/BloodTheLastVampire''.
* StrangledByTheRedString: Deconstructed with Saya and Tokizane. At first, they don't have any meaningful conversation until Tokizane witnessed Saya's slaying of the Elder Bairn at episode 7. By then, he kept Saya's secret and after the school massacre in episode 9, he comforts Saya and confesses his feelings to her which Saya lampshades why. [[spoiler:Until the last two episodes revealed that Tokizane is just hired to play as the "brooding love interest" and he hates it because he only wants money and dislikes Saya's nature]].
* TheyWastedAPerfectlyGoodCharacter:
** Though most of the characters are [[spoiler:hired by Fumito to act as Saya's "friends"]], the biggest one is Tadayoshi, who happens to [[spoiler:half-human, half-Elder Bairn]]. It would be interesting how much he has been under Fumito before the events of the TV series. [[spoiler:Only those who have read ''Blood-C: Izayoi Kitan'' would know what he is before he worked with Fumito and sadly, that manga hasn't been licensed or scanlated yet.]]
** This goes the same with Yuka. [[spoiler:She's a 28-year-old woman who only joins the experiment so she can be the governor of Tokyo and doesn't really care about the gruesome events in Ukishima.]] She even appears in the movie but only in two scenes [[spoiler:where she eventually got her wish in the end.]] It would have been interesting on what kind of role did she contributed to Fumito's organization and possibly, her interaction with Saya if only these two ever meet again.
* TheyWastedAPerfectlyGoodPlot: Majority of the viewers felt that the StrictlyFormula plot (Saya goes to school, meets and eats with her classmates and kills some Elder Bairns at night etc.) of the first half is a waste of time and several suggested to skip episodes 2-4 as it's always the same thing. [[spoiler:And with the revelation that it's a TrumanShowPlot with Fumito as the mastermind, viewers believe that the writers could have, at least, shown the "behind the scenes" of the experiment instead of Saya's POV just to make it more interesting and to avoid dragging the important PlotTwist in an UnTwist]].
* ToughActToFollow: Given the cult success of ''Anime/BloodTheLastVampire'' and ''Anime/BloodPlus'', perhaps it's no wonder that ''Blood C'''s reception has been [[LoveItOrHateIt sadly mixed]] with the low BD/DVD sales. The TV movie, however, fared better than the TV series.
* UnintentionallyUnsympathetic: At first, the show presented Saya as a skilled warrior against the Elder Bairns. But the problem is that she fails in protecting and saving people. The most blatant example is episode 8 and 9 [[spoiler:where she ''just watched'' several of her classmates die before she could attack and at the end, all of them, except the class representative, are dead]]. Her mourning of their deaths was supposed to come out as sympathetic but given the track record of how many people died throughout the show and the [[IdiotBall Idiot Balls]] that she and these people had been holding on, it's not.
* WhatAnIdiot:
** Episode 8. Yeah, nice going Saya! Really good of you to [[spoiler: just stand there while an Elder Bairn started coming towards the class and not warn anyone to ''run.'' Plus, she just stands there and waits for about ''half'' the class to get killed off- before she even considers fighting the monster!]]
** Not to mention the students ''themselves'', who [[spoiler:ALSO just stand around dumbly, ''ogling'' the Elder Bairn until it starts its major killing spree.]] And it gets worse when [[spoiler: after the spider has killed almost the entire class, the last remaining students - instead of just getting the hell out of the building while Saya's distracting the monster - flee to the roof, from where they can't escape. Of course, the Elder Bairn corners and kills them easily.]]
** [[spoiler: The Motoe twins, Tokizane, and Kanako.]] Yeah, there isn't any way that [[spoiler: trying to betray a MagnificentBastard, with a collection of deadly beasts at his disposal, could possibly end badly. No way at all...]]
* TheWoobie: SAYA!
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