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.
Invoked by Banica Conchita. Word Of God is that he intended for Conchita to be more like a monster than a human being. In the novel, while having a perfectFreudian Excuse for her gluttony, nobody really forces her into her contract or her first try at cannibalism, and she's just so gleeful while eating the flesh of the man she claimed to love.
Kachess' reaction to Yufina going missing is to search almost every country to find any form of evidence as to were she went, then disguise himself as a woman to sneak into the Duke's harem and kill the guy to save her. Talk about dedication!
God Never Said That: For a while some fans were convinced that When the girl from Bloodstained Switch was given the injection, she split into two, eventually becoming Elluka and Irina. It was even considered fact on the Evillious Wiki for Pete's sake!. But it turns out they were misreading the information given by Mothy. And ever since The Original Sin Act II album came out, the references made to the song's events on Elluka,Irina and Mas' and pages on the wiki have been removed, and that's probably for the best given what's actually been established in canon.
Due to the fair amount of difficulty in fans outside Japan finding information outside of the songs and the possibility of Youtube reuploaders not sourcing videos correctly, many fanmade songs and PVs for Story of Evil are taken as fact. Interestingly, many plot points from those songs actually do happen in canon, though in different ways (like Daughter of Green introducing a monarch who sacrificed their child's happiness in order to start a war, and Daughter of Vengeance having Germaine wanting to avenge an unjustly-executed loved one). There are still some major differences, leading to a very confused audience when new songs like Thousand-Year Wiegenlied and Handbeat Clocktower contradict what the fansongs claimed.
Hell Is That Noise: The guillotine sound in Daughter of Evil and Servant of Evil, except in certain versions where it just sounds like a rope being cut, and other versions where it's left out entirely.
The gunshot in The Last Revolver.As well as the second one.
I Knew It: Way before The Clockworkers (Irina and Kirill) were revealed to have such a big impact on the story, many parts of the fandom were convinced they would be represented by Iroha (due to Irina's love for cats) and Kiyoteru, respectively. It was confirmed they played those characters in the second "Original Sin" Album
A huge amount of fans guessed a line in Evil Food Eater Conchita was about her being abused by her parents, but it never actually was explained, so that theory lost a lot of popularity. Guess what happened in the novel?
Internet Backdraft: Discussing who Michaela loved is a pretty good way to start an argument in some circles. Fanmade songs, such as Daughter of Green and at least two different songs titled Prince of Blue, get cited as evidence rather frequently in favor of either Kyle or Allen, something not helped by the fact that the official Daughter of White PV actually does seem to suggest Michaela loved Kyle (she appears to be hugging him back). On the other hand, information from books isn't as easily accessible, but they contain the clearest explanations as to Michaela's relationship. The result is a lot of confusion and attempts to sort out what's canon or not. On rare occasions, an argument against Clarith x Michaela will insist that Discount Lesbians or Heterosexual Life-Partners are in play, and the conversation sharply turns into a debate on whether or not that claim is homophobic.
Les Yay: After some years, fan speculation over whom Michaela truly loved - ranging from her having a true relationship with Kyle, as is implied by quite a bit of fanart, or actually being in love with Allen the whole time, which was input into its fanmade song - eventually ended up moot because regardless of whatever she felt towards Kyle, her true love was towards Clarith.
Also occurs in the songs where there are twoRins. In South North Story Rin and Riliane get very intimate with each other and in Screws, Gears and Pride the two Rins pretty much give each other the "it's not you, it's me" speech when they part ways.
In the trailer for Praeludium of Red, there's a brief image of Elluka and Gumilia looking awfully chummy...
Some translations of Capriccio Farce have the doll call Ma "my dear Sorceress of Time".
The Madness of Duke Venomania Manga adaptation makes Lukana Octo a walking magnet of these. She was good friends with Lilien Tanner (a baker), and bought her a beautiful bracelet to match hers. In fact, looking for Lukana is Lilien's motivation to follow the duke at first. There's also an scene where Lukana is hugging and talking to Mikulia about the duke/their situation. Mikulia's only answer is that she loves Venomania... and she also loves Lukana.
Gumillia's feelings for Michaela are compared to Michaela's feelings for Clarith. At first Gumillia vows again and again to protect Michaela, and even before they become human, she tracks down Michaela's location when she goes missing for two weeks; similarly, in both the novel and the song, Michaela emphasizes how much she wants to protect Clarith, and occasionally it's Clarith who wants to protect her. When Michaela tells her that she will remain as a human in order to be with someone important to her, Gumillia responds that she has also just decided there's someone important she needs to protect and will thus remain human for, with the heavy implication that it's Michaela ("if Michaela wants to stay as a human, then I also don’t want to revert back into a spirit"). Later, Gumillia is compared to Clarith when she challenges her on who will get to take care of tree sprout Michaela; Clarith realizes that "Michaela is an important person for her as well", and various characters have referred to their romantic interests as important people.
The scanned images for the Conchita novel have a...interesting image of Platonic and Elluka together.
Irina deserves special mention here, after all she is pretty much the one manipulating EVERY single character (Not even Elluka of all people saves herself from this ...literally) behind the events of Story of Evil and the Pere Noel Organization, we could fill an entire article just listing each one of her schemes, including manipulating Prim Marlon the former resident Magnificent Bastard
Magnum Opus: Story of Evil. Servant of Evil in particular. It's the song that gained mothy his producer name in the Vocaloid fanbase, after all.
Memetic Mutation: After Story of Evil's supplementary material was released, fans are prone to making comments that go "CURSE YOU PRIMMARLON!"
Before that, there was "IT'S ALL KAITO'S FAULT!" due to the fact that whenever something went wrong in the Seven Deadly Sins series, a character played by Kaito would almost always be the cause of it.
Not to mention that before the truth came out about how the hell Conchita was so thin, it was a widely accepted meme to say that it all went to her boobs.
Prim of Story of Evil can cross this in one of several places, depending on whether you consider what happened first in the timeline or what the audience got to see first, but the most damning thing comes when the audience finally sees the whole picture: She triggered two decades' worth of international suffering and warfare, all for the sake of spiting one woman who died halfway through this plot.
Tear Jerker: Many, but special mention goes to Servant of Evil, Regret Message, Daughter of White, Girl of a Miniature Garden, Flames of Yellow Phosphorus, The Last Revolver, Maiden of Wood ~1000-Year Wiegenlied~, Kept Waiting for a Response and White Brick and Black Mourning Dress.
A minor one where Germaine found out that the princess she captured in the Lucifenia Revolution is actually her foster brother whom practically grew up with and loved like family.
Doll: How can the lifeless me understand? How can the heartless me understand?
Meta Salmhofer, in Escape of Salmhofer the Witch. Growing up without parents and engaging in a life of crime for a while, she had a change of heart after giving birth to twins, and resolved to protect her children from experimentation, only to get murdered and her children kidnapped by someone who'd gotten Meta arrested for something she didn't do previously.