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  • Adorkable: Despite being unfathomably powerful, Koro-Sensei is such a pleasant, sweet goofball around his students AND in public it warps straight back to adorable. Heck, even as the original Reaper, he had his fair share of silly moments with his very first (and closest) friend, Aguri.
  • Alternative Character Interpretation:
    • Is Nagisa a bloodthirsty sociopath who constantly hides his true nature behind a gentle exterior? Or is he a genuinely kind student who unknowingly has the skills and mindset of a professional assassin? The series supports the latter interpretation, and he does seem sweet, but after seeing what he's capable of, it's hard to be perfectly sure…
    • In a surprising turn of events, the former interpretation becomes true for another character: Kaede Kayano, also known as Akari Yukimura, at least while she was under the tentacles' influence. However, fan interpretations still vary because it's not entirely clear how much of her personality was an act and how much of it were her based on her true feelings.
    • Korosensei's past as the previous God of Death put a new spin on his motives for taking class E: a remorseful monster who would like to repay the only person who was nice to him or the Joker-esque psychopathic assassin who want to train a class full of teenagers into cold blooded killers to be his "legacy" to the world?
      • At the time of his assassination, his reason for having his students kill him seems to be something else entirely, with the purpose of teaching his students the value of life by having them kill someone they deeply care about.
    • Tomoya Seo and his excessive vanity and sense of superiority. Does he really feel himself to be superior to everyone, or is he only trying to convince everyone (and himself) that he truly belongs among the Five Virtuosos, knowing that he's only included in the group on account of Karma being exiled to Class 3-E as punishment?
    • The Valentine's Day episode heavily implies that Rio has a crush on Nagisa. Combine that with how much she seems to like seeing in Nagisa in drag, this has led some to believe she has a cross-dressing fetish.
    • Karma definitely has a cross-dressing fetish. He loves seeing Nagisa in a short skirt, but is that just because he likes seeing his friend embarrassed (he is a massive troll after all)? Or does he, like Rio, also have a crush on Nagisa? If he does is he in denial, believing anybody would have a crush on Nagisa if he was dressed as a girl? Or does he know he likes Nagisa and doesn’t care at all. Either way, he kept his crush on Okuda under wraps until he was asked by the guys, so we will likely never know.
  • Aluminum Christmas Trees: Yuzuki's codename "This Manga is Amazing!" ("Kono Manga ga Sugoi!") is the name of a real-life annual manga rankings guidebook (Assassination Classroom even ranked first at the Top 20 Shounen Manga list for 2014).
  • And You Thought It Would Fail: As noted under Audience-Alienating Premise, it hinges on kids learning how to kill their teacher with guns, which given the history of school shootings in Western countries, didn't seem it would fly high. That fact is why it took so long to avert No Export for You. However, once it finally did, it's been a fixture on the New York Time's bestseller lists, so it's safe to say it's done well despite all the fears.
  • Angst? What Angst?: There seems to be a narrative event horizon between the major action parts of the story and the rest of it. No matter how many times or how seriously the kids are threatened with death, they shrug it off afterwards with nary a mention.
  • Anti-Climax Boss:
    • How some people felt about the God of Death when he was first defeated. And they tend to forget how far he actually came. It's later justified with The Reveal that the "God of Death" was merely a disciple of the original assassin, Koro-sensei, taking on his name and reputation after betraying him.
    • The astronauts on the space station. Despite noting that Karma and Nagisa's main trump card, a bomb, doesn't scare them, they still give up the information relatively easily. Things are handled with them within a chapter.
    • Class E's battle against Craig Hojou, the Legendary Soldier (manga only). He's built to be extremely powerful, more than even Karasuma, yet in the end he succumbed before being able to fight back effectively. Granted, the whole Class E ganged up on him, executing meticulously coordinated strikes, not to mention their Home Field Advantage, so it's pretty awesome on its own. It's also a big subversion in that Hojou can unlock his true potential by taking off his glasses, but Class E, knowing this, do everything in their power to prevent him from doing that. He also admits that he was hesitant to go all out because they weren't using lethal force. After all, if an assassin does their job right, then every target should be an anti-climax!
  • Arc Fatigue:
    • How some fans feel about the God of Death arc, which lasted around thirteen chapters. The anime averts this by a long shot, completing the entire arc in just two episodes... though, instead, it gets some complaints for being a rushed Pragmatic Adaptation.
    • In a variation, everything after Chapter 153, largely because, with Class E firmly defeating Class A and Koro-sensei's life largely safe, the series has very little to actually do. As a result, much of February drags with the students doing various things, leaving many fans wishing for Matsui to just get to the final arc already. The anime again averts this by condensing the narrative at around this point so that certain events take a few episodes to be covered before getting into the final arc.
  • Ass Pull: The Reveal that Koro-sensei was the real God of Death and the God of Death Class-E fought was his former apprentice, which was clearly planned all along and yet feels bizarrely clumsy in execution. You'd think Koro-sensei would have shown more visible recognition of him. The anime somewhat mitigates this by, during Karasuma and Koro-sensei's face to face meeting with him, having Koro-sensei tilt his head down a little when he hears him introduce himself as "the God of Death", a very subtle sign of his discomfort at hearing his old mantle spoken by his own renegade protege.
  • Audience-Alienating Premise: Even though the series is actually quite popular and regularly appears in the bestselling graphic novels lists, American publishers were squeamish to publish in the first place because the premise of "armed students went all out to murder their teacher (who is an omnicidal alien teaching them their killing ways)" didn't feel adequate in a post-Columbine atmosphere.
  • Awesome Music:
    • "Tabidachi no Uta"note , a severe Tear Jerker of a song that plays in the penultimate episode of the series, when Korosensei is finally assassinated and it continues playing over the crying students after his death, it makes the scene all the more sadder when you realize it was sung by the students themselves to their teacher in one of the saddest scenes ever in anime.
  • Badass Decay:
    • The God-of-Death loses a lot of his badass aura as the chapters moved along with The Reveal that both people he "killed" on-panel turned out to be alive and well. Chapter 133 offers an explanation: it turns out he wasn't the real deal that Lovro spoke of. The true God of Death was Korosensei.
    • Kayano being taken out early in the early stages of the class civil war (chapter 145 to be more precise) can be considered this. However, given the fact that she had just recently recovered from the side effects of the tentacles, this can be considered a Justified Trope.
  • Bizarro Episode: The Space Station arc (chapter 150-153) is resolved very quickly despite being a seemingly complicated endeavor being over by the end with a near snap back to normal for attempting assassination, with Karma and Nagisa having no trouble convincing the astronauts to do what they want despite the astronauts pointing out their threat of a bomb is worthless. Only one chapter is even spent on the space station.
  • Broken Base:
    • The ending of the Space Station arc split fans, with some being okay with a temporary Snap Back, while others were unhappy with how rushed this trip was, especially considering that this would have ended up being completely pointless if the discovery about Koro-sensei's new probability to explode (which was reduced to 1%) wasn't brought up later. There was even confusion on whether the series was cancelled in chapter 153, after this statement was brought into the class' discussion.
    • Those who have read the manga are really frustrated with the anime adaptation for its Adaptation Distillation that completely skipped several A Day in the Limelight chapters for the other students that gave them Character Development, rushing through the arcs, and leaving out several important information that leads to several plot holes in the anime. Other fans, meanwhile, thought that the manga was too padded and appreciate the anime quickening the pace.
  • Complete Monster: While this series is normally lighthearted, it gets dark very fast whenever these two villains appear...
    • Shiro, real name Kotaro Yanigasawa, was a Mad Scientist focused on utilizing Antimatter in a human body, and the reason Koro-sensei may destroy the world. To this end, he used the famed assassin the God Of Death as a human guinea pig in painful experiments, using his own fiancée as their liaison since Yanagisawa figured she was worthless as a hostage. When the God of Death escaped, destroyed the lab and took Yanigasawa's eye, the scientist formed the identity of Shiro and plotted his vengeance. He implanted a boy named Itona with the same tentacles and later abandoned him to die when he'd served his purpose. Mutating the assassin's former protege into a monstrosity, he tested his new success by having him annihilate a giant building—and anybody inside—before attacking Koro-sensei and his students. Having the second God of Death attack Koro-sensei, Yanagisawa opted to then have the students attacked, gloating how he'd kill every single one of them painfully and Korosensei would be forced to watch his class die before dying in despair. When his former fiancée's sister attempted to help Korosensei, Yanagisawa had her impaled through the chest and gloated how he'd intended to use her as a "replacement" for her sister.
    • Akira Takaoka is a brutal military trainer known for torturing his students with sadistic relish while he breaks them mentally. During his brief stint as Class E's trainer, he is willing to brutalize any unruly student, regardless of gender. After being ousted, Takaoka devotes himself to revenge. After stealing money to buy a bio-weapon and hire hitmen, he infects Class E with a virus to cause a horrifyingly painful death as they slowly suffocate under the weight of tumors. The few students who escape this fate are targeted for even worse fates as Takaoka intends on burying Kayano alive in cement in a bathtub full of material lethal to the kids' teacher Korosensei, which would force him to sacrifice his life to save her. To drive in his victory, he even destroys the antidote while gloating he might use the money to purchase middle-school aged kids to murder on a regular basis as some twisted celebration.
  • Ensemble Dark Horse:
    • The Japanese otter that appeared in chapters 56 and 88. It's placed 7th in the first popularity poll with 71 votes.
    • Isogai, who ranked sixth in the popularity poll of volume 12, making him the most popular character outside of the main trio of students and teachers. Besides this, both him and Maehara are the only other two students who sing the two opening themes with the main trio for the anime.
    • Kurahashi ranked 8th in the popularity poll, beating Kayano by 2 votes, making her the most popular female student among the cast despite not having as much panel time as most of them.
  • Epileptic Trees: Lack of any sort of on-screen villainy (even his perversion does not discomfort the target in any way, for example, he would never steal underwear) makes the theory that Koro-sensei is not the Omnicidal Maniac we're told he is rather popular. This theory would turn out to be completely correct.
  • Fan Nickname:
    • The "Omni-Directional Bitch Smack". It's first introduced in Chapter 17 and returns in full force in Chapter 95.
    • Many fans have difficulty remembering the names of the numerous Class E students, so they're frequently referred to by their standout trait. For example, Sugino, Sugaya, Okuda, and Kurahashi are known as "Baseball guy", "Art guy", "Chemistry girl", and "Bug girl", respectively.
  • Friendly Fandoms:
    • With JoJo's Bizarre Adventure due to the series' tendency to combine over the top characters, humor and action with some serious drama. There's also the fact that Matsui was inspired by the JJBA franchise. Some have eveen seen Assassination Classroom as a Spiritual Successor to JJBA since JJBA no longer runs in Shounen Jump. It also helps that both seasons of the anime aired while a JJBA season was airing.
    • Also with Danganronpa as both series involve characters in classroom settings where their assignment is to kill someone as a "graduation requirement" while putting emphasis on many students who all have unique characteristics and talents. It also helps that both animes share the same animation studio.
    • There are a few Assassination Classroom fans who are also fans of Akame ga Kill!. For the most part this seems to be a result of the fact that both shows are centered around assassins but with a tone of black humor and the anime for Assassination Classroom aired right after the anime adaptation of Akame ga Kill! finished.
    • Though Assassination Classroom is much older than My Hero Academia, people who've seen both shows seem to have similar fondness for both. Largely due to their school setting and the similarities between various characters in both appearance and personality, especially their main three characters.
  • Genius Bonus: In Chapter 53, the English "monster" is covered with the words of the actual text of the question it represents, and the students' attacks leave an imprint in the form of their answers. Not only are the questions and answers written in perfectly grammatical English and Japanese, they match the explanation given for the reason behind their difference in effectiveness: Seo's answer is written in the sort of formal language you would expect to see on a test, while the question and Rio's answer are in Holden Caulfield's informal, slightly dated narration style.
  • Harsher in Hindsight:
    • One chapter has an image of a man taking a bite out of an Anpanman caricature. Takashi Yanase, the creator of Anpanman, passed away during the same week that this chapter was published in Shonen Jump.
    • Starting with Chapter 112, all those jokes about Nagisa's girlishness suddenly became a lot less funny with the reveal that his mother is very emotionally abusive towards him and wishes he was born a girl. This extends to things like forcing him not to cut his hair.
    • Much of the humor involving Kayano concerns her chest, even once being labelled "Forever Flat". In Chapter 173, "Number Two" makes it so she really has nothing in that area (fortunately, Koro-sensei was able to save her).
    • The entire series ends up as this with the revelation that Korosensei will die no matter what Class E does and his daily routine becomes more of a bucket list before his inevitable death.
  • Ho Yay:
    • Karma/Nagisa is a very popular ship that crops up in the manga (and anime) from time to time (or for some fans) whenever the two are interacting with each other. However, their duel during the classroom civil war was what brought a lot to the table for the shippers.
    • Maehara/Isogai is the only boy on boy ship (that isn’t Karmagisa) to get official art.
    • Female examples:
      • When Kanzaki is volunteered to join the Kyoto trip group that Kayano is, Kayano immediately says she has no objections while gaping at Kanzaki, a blush on her face as she does so. In the anime, there's also a tickling scene between the two of them.
      • Kataoka saving Kayano in the pool. The latter even says that Kataoka was so cool she think she might have fallen for her.
      • Kayano makes a similar comment to Yada again.
      • In a relationship chart, Yada's relationship with Kataoka is described in the same manner as Irina's relationship with Karasuma.
      • Irina is also teaching her female students the art of the French kiss.
  • Hollywood Pudgy: Hara is occasionally labeled as fat despite only really being slightly wider than the rest of the girls.
  • I Knew It!:
    • Let's just say that Koro-sensei having been human and him dying next March anyway was something that many people had figured out within the first few chapters.
    • The reveal that the woman in Koro-sensei's flashback was Class E's previous teacher and/or his The Lost Lenore was also a twist that a good number of fans saw coming from the start.
    • A lot of people called it that the end of the classroom civil war was going to be a duel between Nagisa and Karma.
  • Magnificent Bastard:
    • The elusive Reaper raised himself from an impoverished child to the most feared and brilliant assassin in the world. Raising the son of one victim as his apprentice, the Reaper expanded his business until his apprentice betrayed him to the vile scientist Kotaro Yanagisawa. Falling in love with the abusive Yanagisawa's fiancée, the Reaper eventually breaks free of captivity by slaughtering Yanagisawa's guards when his lover is fatally wounded. Knowing the experiments will cause him to self-destruct along with the earth within a year, the Reaper becomes caring a teacher of troubled youth, "Koro-sensei", grooming their self-confidence while imparting the skills to kill him and save the world.
    • Gakuhou Asano was once a caring teacher who sought vengeance on the bullies who drove one of his students to suicide by getting them addicted to gambling, ruining their lives in the process. Becoming the chairman of Kunugigaoka Junior High School, Gakuhou established a system that ensured the top 95 percent of the students would be successful, by demeaning the lowest 5 percent, Class-E. He would make sure that the top 95 percent would constantly triumph over Class-E in academics and sports, by subjugating them to his brutal teaching methods. Willing to prove that his system is flawless, Gakuhou challenges Koro-Sensei to opening one of five handouts, four stuffed with grenades lethal to Koro-Sensei and one a regular grenade. When Koro-Sensei avoids the barrage of the four lethal to him, Gakuhou uses the regular grenade in an attempt to take Koro-Sensei with him. Having a change of heart after Koro-Sensei saves him, Gakuhou accepts his loss with grace before resigning as chairman.
  • Memetic Mutation:
    • Thanks to some memorable one-liners from the students.
    • Ansatsu Kyoushitsu is an assassination manga.note 
    • A lot of the Class-E nicknames have become favorites for readers to refer them as. "Justice", "Tsundere Sniper", "Adult Game Protagonist", and "Forever Zero" are usually the most used.
    • Reactions to Chapter 128 became very common after the chapter release. There's even a Pixiv tag dedicated to it.
    • ASS CLASS
    • Civil Warnote 
    • Invincible Teachernote 
    • "I GAVE YOU POPSICLES!"note 
  • Moe:
    • After Koro-sensei's upgrades, Ritsu's moe level goes through the roof. She develops a sunny disposition, really cute mannerisms, and a desire to befriend her classmates as they work together to assassinate their teacher. She's appropriately nicknamed in-series as "Box Full of Moe" later.
    • Nagisa is incredibly adorable due to how nice he is and how harmless and approachable he appears. He even forms a Moe Couplet with the aggressive-and-scary Karma, who is his long-time friend.
    • Kayano is cute and cheerful as well, although it's more intentional on her part so as to hide her true nature.
    • Kurahashi invokes this in-series, being popular with her classmates for her upbeat personality, and as one boy had commented in their poll of the girls, "charming poses". Her love for all living things will also endear her to many an animal lover.
    • Yukiko Kanzaki. She’s just as lovable to both her classmates and the fans. In fact, she is the class idol because all of the boys have crushes on her and all the girls are her friends. Why is she so popular? Two reasons according to the boys: "a great personality and super cute looks".
    • In a strange way, Itona. How short he is and how wide his eyes are hold a big cuteness factor when combined with his awkwardness around other people.
  • Moral Event Horizon: Takaoka crosses it when he knocks the wind out of one of the students. From there every action just keeps crossing it over and over again.
  • The Scrappy: Hiromi Shiota, Nagisa's mother, was instantly hated by the fans when she was introduced in Chapter 112. She uses Nagisa to live her life anew, denies him control over his own life and gives him no say in his future, so as to not make the mistakes she made. She also refuses to acknowledge his gender, and immediately goes into a rage when he makes any sort of defiance against her, even if it was unintentional on his part. The next few chapters with her show just how deluded she is about everything. She's so detestable that she would easily qualify as a Hate Sink instead of The Scrappy, if not for the way Nagisa handled things in the end, making her a massive case of Karma Houdini and Easily Forgiven, so it's unclear if she was actually intended to be hated as intensely as she is. While she did mellow out after her introductory arc, it's hard to forgive how she treated Nagisa and the fact that she attempted arson and planned to frame her son for it.
  • Seasonal Rot: What a number of fans have felt in regards to the manga come the third semester. Common criticisms include poor pacing, a large amount of unnatural snapbacks that render several dramatic revelations largely pointless, an overexposure of Nagisa and Karma at the expense of everyone else and the loss of the conflict between Class E and the rest of the school, one of the main plots of the series. Note however this opinion is far from universal, as some fans appreciated the down-time after all the preceding craziness.
  • Ships That Pass in the Night: Yada and Kimura are usually paired together in fanart despite the very limited interactions between the two and the confirmation in Roll Book Time that Kimura has no special feelings for her even though it's implied that their relationship is a close one.
  • Shocking Moments: The Kayano revelation in Chapter 128 ended up setting the internet ablaze with people trying to find every possible hint that could have been leading up to this moment.
  • They Wasted a Perfectly Good Character:
    • Despite the major build up of the new students transferring into Class 3-E, Ritsu and Itona are mostly only present as comic relief after becoming official members of the class.
    • The God of Death, more specifically, the "Death" part. During his screentime, he fails to kill any named characters. By chapter 117, the people he killed to establish his badass cred were shown to both have survived. However, it is later revealed that this God of Death was merely the apprentice to the previous God of Death. The previous God of Death was Koro-Sensei.
    • For a character with as much screen time as Nagisa and Karma, Kayano doesn't get as much Character Development, even compared to some of the more minor students of Class E, even if The Reveal of Chapter 128 and onward reveal that this was intentional.
    • Rio Nakamura is probably the only girl aside from Kayano that Nagisa and Karma most frequently interacted with, and yet she was still at best a supporting character. She shares Karma's love for trolling people, has an implied crush on Nagisa, and she has serious Hidden Depths to boot. Some think she would have been a more interesting third member of their trio, especially since the whole point of Kayano was to stay in the background for The Reveal.
  • They Wasted a Perfectly Good Plot:
    • A fairly minor one, but Karma was put into Class 3-E when he beat up one of the A-class students bullying them. Which E-class student, however, is never revealed.
    • When Lovro is killed by the God Of Death, it could have given Class E an unnerving perspective of the meaning of death, especially of a loved one. Turns out that he survived.
    • Nagisa's desire to become an assassin. Which is dropped without mercy about 2 chapters after it's mentioned, and replaced with the old "I'll protect everyone" cliché, and him later deciding to become a teacher.
    • Some people felt that the entire plotline concerning Nagisa's mother either wrapped up too quickly or didn't have a satisfying enough conclusion.
    • Gakushuu Asano trying to find out Class E's secret. After his failed attempt during the second Final Exam Arc, he has apparently forgotten about it despite having at least two very good chances to do so.
      • This can be justified in that he at first only saw Class E as a means to get some leverage on his father by finding out their secret and using it as blackmail material. In his later appearances, his main focus is on defeating Class E as payback for his first defeat rather than trying to one-up his father.
    • The Space Station arc spends only one chapter on the space station with Karma and Nagisa convincing the crew to hand over their research easily despite their fake-bomb being dismissed as not a threat. It turns out in the end they were close to what the needed all along anyway, too, with one of Okuda's early "poisons" for Koro-sensei being the key. This last one, though, gets lampshaded in-universe and the discussion leads to the fact it wouldn't have been possible without everything they had gone through first.
    • God of Death's face-changing ability never once comes into play for the story.
    • During the climax, Shiro turns himself into a tentacle mutant, but he doesn't put it to much use. Subverted in the live-action movie, where he took God of Death's role as Korosensei 2.0.
  • Unintentionally Sympathetic: In the manga, Kaho is meant to be a Dirty Coward Bitch in Sheep's Clothing who deserves the humiliation she receives. Several readers, however, think she comes off as someone trapped in a relationship with an abusive boyfriend and thus have more sympathy for her fearfulness, feeling that Class E's retribution on her was disproportionate to her alleged crimes.
  • Unintentionally Unsympathetic: God of Death's dying moments were supposed to paint him in a sympathetic light. However, he was also a remorseless killer who betrayed Koro-sensei just because he didn't give him enough attention. There's also the fact that he begged Koro-sensei to train him, showing no empathy for the fact that he murdered his father.
  • Values Dissonance:
    • Unlike most of the students, Yuuma Isogai was placed in Class 3-E for having a part-time job, which was regarded as serious a violation of the school regulations. Though this looks like another one of Kunugigaoka Academy's ridiculous, unfair policies to some readers, it's actually pretty common for schools in Japan to forbid their students from working so they can focus on their studies.
    • The concept of Class E and the school system in general tend to have some Westerners wonder why no one has come and shut down the school for mistreatment of its students. In Japan, and other Asian countries, it is not unusual to place students into a class based on their overall performance, putting smart students in one class and the more academically challenged ones in another, such as Class E. In addition, bullying children simply for not being smart or for standing out too much is a seriously common occurrence among students and families, and most schools in Japan would respond to the bullying with maybe a verbal warning or even victim blaming. A more in-depth explanation can be found here but overall while Assassination Classroom may exaggerate the school system, it's not too far off in its portrayal of how the outcasted students are treated by those around them.
      • At the end of the series, once the full details of the Class E system are revealed to the public, the public outrage forces the school to disband Class E and sack the Chairman. But this is less about how the class was treated by the rest of the school and more about how the kids were secretly being taught to be assassins and had a world-threatening monstrosity as their teacher, which Asano had agreed to keep concealed from the public.
    • Some Americans may feel shocked by the stag beetle episode. Bug hunting & selling is acceptable in Japan, but it'd be considered poaching across the sea; especially since they're selling the animal for its abnormal coloration.
    • While Irina's sexual advances on her students are meant to be played off comedically, many of the audience (mostly outside of Japan) are put off and horrified by her doing, especially since the students are not yet of age.
  • Viewer Gender Confusion:
    • The majority of newer fans were once unsure of Nagisa’s gender (just as the original fans were) when they start getting into the series. He says he’s a guy a little bit into the series (and he is) but his slim build and (very girly) pigtail-like Anime Hair make classmates and fans alike question this for a little while. To make things worse, in the animated adaptations, his voice is clearly that of a female.
      • It gets lampshaded in chapter 43, when the class goes for a swim in their school approved swimsuits. Rio Nakamura, who finally sees him topless, notes that it was really hard to tell until that point.
      • Later chapters actually have Nagisa forced to cross-dress as a girl in order to disguise himself. Though his gender was confirmed at this point, it nevertheless perpetuated the confusion even further.
      • One rich guy that Ryo and Karma insist Nagisa date (as a girl) at their festival believed Nagisa was lying when he finally decided to tell the rich boy his actual gender. (To be fair to the rich guy, Nagisa was wearing a short skirt when he told the truth).
  • The Woobie:
    • All of Class E can be considered this after seeing the other students and teachers treat them like pariahs, since they are basically punching bags for the rest of the school. Luckily, Koro-sensei is there to help rebuild their confidence.
    • Nagisa gets a second dose of this when you consider his home life.
    • Irina herself, during the Island arc confessing she took her first life at a young age, that of the murderer of her parents and had to share the body heat of her victim to stay alive; she embraced the world of assassination instead of fearing death, as Lovro told her the memory of the kill would never leave her. And the God of Death arc elaborates how she felt the relative normalcy of her life with the students had to be nipped before she became too engulfed in it, even if it made her happy. Leading her to betray them while trying to prove her own strength.
    • Class E's previous teacher, Aguri Yukimura was a devotedly hard worker with a real love for what she did and was kind, but was pushing her efforts to a group of students broken enough by the system to believe that working harder will lead them nowhere. She also had an abusive fiance easily upset with her in the form of Kotarō Yanagisawa, better known to us as Shiro. She then falls in love with Koro-sensei, who she witnesses in experiments becoming less and less human (physically speaking; personality wise he was becoming human again). All this, and we know of her fate from the start.
  • Woolseyism:
    • In the English dub, Irina does not teach English to the students, but instead social skills and grammar (and their use in assassinations). For example, in Episode 10, instead of discussing how Japanese speakers have trouble with the English L and R, she's teaching how icebreakers are used by assassins.
    • Isogai's A Day in the Limelight episode has the other students refer to him as an "ikemen", the Japanese term for someone who isn't only good looking but extremely talented and deserving of respect. The subs translated this as them simply saying "what a cool guy!", but the dub goes for the more effective and equally meaningful "he's Prince Charming!"
    • The English dub of the Korosensei Drawing Song manages to retain everything in translation and get the lyrics to rhyme.
    • The English subtitles for the movie's release in Asia rename Korosensei as "UT" (short for "Unkillable Teacher") and Ritsu as "S.T.A.R." (Self-Thinking Artillery Robot).

Alternative Title(s): Ansatsu Kyoushitsu

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