These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Black Butler
Alternative Character Interpretation: Happens a lot with Ciel; some people think he actually cares about others, and other people think he does not care at all about others or even hates them. Part of this is due to his extremely different personalities in the two canons (manga Ciel and anime Ciel have a lot of differences). This also happens with a few other characters, but to a lesser degree.
Despite there being no real proof, there are some people who genuinely believe that Sebastian is losing himself to his butler persona and becoming more human and less cruel.
This interpretation seems to be implied by the lyrics to Bird, the second season's first ending theme.
Angst? What Angst?: Finny's backstory includes him being locked in a stone room and experimented on for an undetermined amount of time. The amount of times he complains about this? ZERO.
Every character with a Dark and Troubled Past is subject for this except for Ciel. Ciel's other servants are a mild example, as well as Madam Red and the circus kids.
Grell as well, to some. She's a MtF transsexual and everyone in the series is rude towards her (including using male pronouns constantly). She doesn't seem to care at all, though.
Broken Base: Team Phantomhive and Team Trancy. The manga lovers and anime lovers.
Episode seven of season 2 seems to have caused this for Ciel. Fans are divided between those who approve of his 'murder' of Alois, like him better for it, and feel it was perfectly in line with his character and those who feel he went past the Moral Event Horizon and either actively dislike him or can't decide how they feel.
Is Elizabeth's reveal as Badass a good character saving moment or descent into Mary Sue-dom?
Angela Blanc/Ash Landers in the latter half in the first season, while they to present themselves as well-intentioned, it's very obvious that both are extremely perverse, Angela being a dominatrix going after everything that can move including a transforming dog, fusing Ciel's parent's together as an abomination they'd later use to try and murder him, toss their loyal doll minion like trash and faithfully turning little girls into dolls, trying kill the cultists who had been loyal to them once they served their purpose, manipulating the queen into planning a world war, only to leave her to die and sacrificing the population of London to create a barrier bridge against demons and empowering themselves. No wonder Sebastian calls them fallen.
Lord Trancy from episode 8 of season 2. He has a bunch of boys captured and made into his sex slaves right up until he dies of old age. He even gets rid of those that are "broken", calls the boys "dolls", and beats them. He's the reason why Jim Macken/Alois Trancy (the Sole Survivor among those poor boys) is...the way he is.
Die for Our Ship: When it comes to pairing up Ciel, you either go with Sebastian or Elizabeth. Well, the anime gives you only one choice at the end. And guess what? This trope is inverted. Sebastian might have Ciel's soul and technically wins over Lizzie... but only because Ciel is dead.
At the conclusion of the second season, Ciel is alive, but as a demon, he leaves London, and Sebastian still wins...er...loses? As he is stuck as Ciel's butler for eternity— which he never wanted.
Actually, judging from most of the discussions this troper has seen about the subject (Tumblr, Kuroshitsuji forums, etc.), many people are either welcoming of the Character Development to downright ecstatic (to the point of Memetic Mutation, see below). Though how far people's newfound respect for Lizzie reaches into shipping is still up for debate.
Nope. Go to the Headscratchers section on the series and scroll down a bit. There are SEVERAL tl;dr paragraphs on how stupid/personality-less/ Lizzie is, and these come AFTER the big reveal (which is "obviously" a super and horrible Ass Pull). So no, the terrifying and unreasonable misogyny from both fangirls AND fanboys in regards to her is still on, and women cannot win.
Draco in Leather Pants: Madame Red often goes through this treatment. While she has a rather sad backstory, most fans tend to ignore her rather brutal murders as Jack the Ripper and view her in an oddly positive light.
Grell. Many people seem to forget and forgive that she was one half of Jack the Ripper, and that she murdered Madam Red.
Arguably, nearly all of the characters are subject to this. Sebasitian and Ciel are sometimes downright glorified in fanon for their dastardly deeds, and people seem to have forget the crap that Druitt pulled upon first appearance (though it's probably because he's become nothing much more than comic relief by this point). We can also add Undertaker and Claude to the list.
Ensemble Darkhorse: Grell. Her popularity is hugely disproportionate to her screentime, at least in the manga.
Ronald Knox can now be this.
Undertaker as well.
The seaweed in the Hamlet OAV is an in-universe example.
Cosplaying as Madame Red can catch a ton of eyes in public, so it's very off-putting when one watches the anime to see that the humorous, cheerful, strong-willed, attractive and motherly aunt is revealed to be one of the villains and dies within that same episode very early.
How some fans are treating Kuroshitsuji II due to its writing problems.
Many fans, particularly those who are big on yaoi and pairings, seem to treat Grell as a male, although this is possibly more due to the fact that Grell's status as male-to-female is only confirmed by Word of God.
Other fans consider the entire anime to be discontinuity.
Foe Yay: Grell attempts to have this with Sebastian in her first appearance in the anime and only (so far) appearance in the manga. Sebastian appears torn between being sick or requesting a restraining order.
Also between Sebastian and Angela/Ash.
And, as of Season 2, Alois Trancy to Ciel. Ciel is not entirely sure how to react to the former. Episode 6 of Season 2 shows enough between Claude and Sebastian to match up with the two.
Freud Was Right: Not as prominent in the manga, but the anime version of Ciel's subconscious definitely had some choice words for Vincent.
Growing the Beard: The manga was very episodic until the circus arc, in which the story drastically improves
Harsher in Hindsight: In episode 9, Finny mentions the fact he accidentally killed his pet bird when he was younger. It becomes even harsher when we realise the bird was probably his only friend when he was used as a guinea-pig.
I Knew It: A vocal minority of fans spent much time attempting to reassure the rest of the fandom that A-1 were trolling the fanbase and that Ciel and Sebastian would return in full capacity, despite the announcement of the new master and butler. Guess what happened when episode 1 aired?
Some fans were guessing that Alois was cross-dressing to meet Ciel after a preview for episode five. They were right.
In the murder mystery arc in the manga, a lot of people speculated that Sebastian was not really dead; they were right. Some others also speculated that a snake would be used to commit one or more of the murders; they were also right.
It's the Same, Now It Sucks: The second season, after it was revealed that Ciel and Sebastian will return. A few fans would have liked it to be independent from the original duo.
Jerkass Dissonance: Most fans seem to completely ignore Grell's ruthless and sadistic streak and tend to portray her as something completely different.
Jerkass Woobie: Ciel can be seen as this, since he doesn't mind killing or hurting anyone who gets in the way of his plans, but at the same time, he is portrayed very sympathetically, usually because of his horrible past.
Alois. He has a horrible past, and as a result, the only person he depends on for happiness is Claude, who openly admits that he honestly does not care about Alois at all, and just stays by his side so that he can use him to obtain Ciel's soul, despite the fact that most of the horrible things Alois does to people is mainly just because he wants Claude to pay attention to and care for him. "Hey... you look like you're seeing maggots squirming in a dung heap..." God knows what he's going to do now that Claude doesn't even pretend to care about him any more. And in episode 8, Claude says "A soul such as that...is certainly unfit to sustain me," referring to the fact that Alois actually feels love for him and Claude finds that disgusting.
At the end of season II, even Sebastian can count as this. That look on his face when he realized that he'd have to serve Ciel for all eternity and will never be able to eat his soul was absolutely disheartening for some fans.
Alois: Although he spends most of the series as The Chessmaster mostly because of his immature mannerisms, he graduates to this level when he makes a contract with Hanna detailing that she gets Sebastian and Claude to fight for the ownership for Ciel's soul. And the winner... will be screwed over when they find out that Ciel's soul can't be consumed because Ciel has become a demon.
Marty Stu: Sebatian could be considered this, but it's justified since he is a demon. Ciel sometimes wishes Sebastian would fail at something, purely for the humor of it.
Though the justification is for naught in the second anime, where all of the other demons are quite flawed. Except for Sebastian.
Alois' outfit has more or less reached this status by now.
Memetic Sex God: Sure, everyone loves to get touchy-feely on Ciel, who has had his own Stalker with a Crush since he was seven years old, but if you are in-universe and don't have a thing for Sebastian, you don't have a pulse. Or Abberline. Anime-wise, even the dog and an angel want Sebastian.
Everybody wants Undertaker to bury them. Everybody.
Misaimed Fandom: There are a lot of people in the fandom who ship Sebastian and Ciel and want them to live Happily Ever After. This is despite how Word of God has emphasized that Sebastian is a demon who only wants to eat Ciel and that Ciel does not trust him. Still, with all the Ho Yay going on between those two, it's hard to blame the fans.
Some people took the infamous scene in which Ciel vomits and Sebastian lovingly cradles his head while smirking as a sign of love and affection on Sebastian's part and still rejoice in it to this day despite how utterly devastated Ciel was at that time. Because of all of the Fanservice piled onto this series, a lot of fans tend to not realize how pivotal some scenes really are simply because of the sexy factor.
Moe: A lot of characters, in both male and female varieties.
Moral Event Horizon: As of episode 8 of the second season, Claude has crossed it, for many people.
A minority of fans believe that Ciel crossed it when he ordered Sebastian to burn down a building full of children, and then ordered him to kill Doll.
Baron Kelvin dismembering children's body parts for the purpose of being beautiful like Ciel.
Narm: The line from episode 15 "This is not your fault. She is possessed by the evil spice" is impossible to take seriously even in context. The same is true for much of the episode.
Ship Sinking: Done in episode 7 of the second season in regards to the Ciel/Alois and Claude/Alois ships when Ciel stabs Alois in the stomach and tries to stab him in the head but is stopped by Claude (though he struggles with Claude and Sebastian in an attempt to get back to Alois's side so he can kill him) and when Claude proceeds to completely ignore Alois's pleas for help after getting a taste of Ciel's blood. And in episode 8 Alois practically confesses his love for Claude who smiles and holds his face tenderly before crushing his skull.
Though, the Claude/Alois ship seems to be at least partially restored in episode 12.
Stoic Woobie: Ciel. Overlaps with Jerkass Woobie. Despite the things he has been put through, he usually doesn't complain about them and always tries to keep moving forward. Though, there was one time in chapter 34 where he appeared to snap.
Squick: Lord Kelvin, Grell, and Ciel's tailor aside, it should be mentioned that the writers sometimes seem to go out of their way to add as much Ho Yay as possible between Sebastian and Ciel, especially in the anime. Unfortunate Implications, much?
Alois and Claude are heavily implied to have a sexual relationship. Alois /Jim has a rather squicktastic way of relating to the men in his life.
Claude kissing Ciel /Alois's foot.
Every. Single. Scene. Involving the Earl Trancy in season 2. "Another doll broke?"
Baron Kelvin too.
There are also way too many loving pans of Ciel's prepubescent body for some readers' comfort. Particularly in chapter 62, dearLORD...
Viewer Gender Confusion: Finny. Grell as well, in both butler and reaper form. Alois is also fairly common, and Ciel for some, as well.
What Do You Mean, It's for Kids?: The series has Seinen or Josei written all over it, but is published in a Shonen magazine. It includes violence and gore, murder, child abuse, sex (and in the anime, rape), pedophilia, and questionable dialogue. If you're looking for more lighthearted stories about them living in the mansion and solving basic mysteries, like the first part of the first season, you are in the wrong place.
The Woobie: Hannah could be considered this, due to Alois's treatment of her. Subverted when she is revealed to be a demon, and could easily fight back if she wanted to. It's implied she actually enjoys the attention.
Margaret Turner, the potential Jerkass Woobie. Sure, she's nuts, but seeing her put down so much, just for her weight, makes you wonder if she had a good reason.
It wasn't because she was put down for her weight, it was because she was unsatisfied with her marriage. Either way, there's no real justifiable reason for brutally killing innocent newlywed women.