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Kunugigaoka Junior High School's Class 3-E is infamous for harboring its bottom 5% ninth-graders, created to give the rest of the student body (faculty included) a target for intense discrimination and thus a motive to keep their grades up.

To add insult to injury, its students are banned from entering the main campus, instead relegated to a distant, rundown mountaintop Cram School. This isolation, however, is the ideal place for a top-secret mission placed upon its students to attempt to assassinate their alien-like teacher who is threatening to destroy the world in one year.

Despite being part of the class comprised of the school's "worst", each student has a characteristic which defines him/her and becomes his/her weapon. As the series progresses, they become better in assassination, P.E. and studying.


Beware of inherent spoiler tropes!

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General tropes associated with Class 3-E:

  • Action Girl: Given the nature of the class, all the girls are naturally expected to be at least competent in various disciplines of battle.
  • All Men Are Perverts: While Okajima is the most blatant example, most of the other boys are no better. In Chapter 88, they outfit Itona's RC tank (which was supposed to be an assassination tool) with a webcam to be able to peek underneath the girls' skirts. And they do so with serious faces while operating in a professional manner. Koro-Sensei Quest! parodies this with most of the boys being barred from entering the Elf Queen's realm because of their impure thoughts (including the otherwise kind-hearted Isogai, by virtue of wearing only half an armor set out of pure necessity).
  • A Lighter Shade of Gray: The teachers are the portent of an Apocalypse How, and a couple of trained assassins (one of which is enough of a Jerk with a Heart of Gold to be nicknamed "Professor Bitch"). The students are being trained as assassins in order to kill said apocalyptic teacher. That said, they're leagues nicer than the rest of the school (and the students' assassin training is being done to save the world).
  • All of the Other Reindeer: Class 3-E is a byproduct of Kunugigaoka's system, which keeps the lowest 5% together as an Anti-Role Model for the other 95%, who are also encouraged to keep their grades up with a system of institutionalized discrimination. Of course, this only applies to their grades and popularity, not their ability to kill.
  • Assassins Are Always Betrayed: The fact that nobody got hurt when Shiro blew up a pool that most of the students were swimming in required a good deal of luck. The intention may not have been to hurt them, but it was clearly negligent of their safety.
  • Badass Adorable: Most of the students are adorable to varying degrees. All of them are assassins in training that can scare their A-class bullies with merely a stare.
  • Badass Bookworm: Played with. The main purpose of Class 3-E was to serve as a dumping ground for Kunugigaoka's worst students, though it is revealed that they (even Terasaka, relatively the most Book Dumb of the lot) are pretty good at studying, just not good enough to stay out of the bottom 5%, while a few are present for different reasons — Kataoka, Hayami and Chiba were academic achievers who were frequently guilt-tripped by their schoolmates into helping tutor them, which took its toll on their own grades, while Karma and Isogai were sent there as disciplinary action (the former for his Bully Hunter tendencies, the latter for violating school rules by having a part-time job).
  • Badass Crew: All of the students are being trained to assassinate Koro-sensei, and thus compared to most kids their age they are at least competent in various martial disciplines. As for the faculty, Koro-sensei himself is very fast, smart, and (if he can) powerful; Karasuma is a high-ranking government special forces agent with some serious combat skills; and Irina is an assassination prodigy using both her intellect and sex appeal to accomplish her missions.
  • Berserk Button: When Irina calls the class the "E class jerkwads" and tells them that studying would be meaningless, she gets pelted with school supplies by the whole class.
  • Boke and Tsukkomi Routine: Generally speaking, most of the class (especially Nagisa and Karasuma) will play the straight man to Koro-sensei's crazy antics. It's often lampshaded by the students, who will occasionally mention wanting to "tsukkomi" in response to whatever ludicrous situation they've just been presented with.
  • Book Dumb: Downplayed. All of Class 3-E are fairly intelligent by normal middle-school standards. They just had the misfortune of being the bottom 5% of an extremely competitive, prestigious school, where the other 95% are extremely motivated not to become like them, and are even encouraged to bully them. After studying for several months under Koro-sensei, Karasuma and Irina, all 28 students reach the Top 50 at the end of the second semester, with Karma narrowly edging out Asano Jr. for the top spot.
  • Break the Cutie: At the end of Chapter 177 / Season 2 Episode 24, all the students broke down crying after they were forced to fulfill their end of the deal with Koro-sensei and finally kill him... after spending an entire year learning to become better people under his tutelage and becoming endeared to him.
  • Character Title: The whole class is part of the "Assassination Classroom".
  • Charles Atlas Superpower: Their training eventually includes lessons on Le Parkour. In short work, they're good enough to jump across rooftops In a Single Bound.
  • Child Soldiers: A variation, in that they're training to be assassins rather than traditional soldiers. Nevertheless, their teachers (Koro-sensei, Karasuma and Irina) ensure that they can have a normal life in addition to their training.
  • Code Name: Chapter 89 / Season 2 Episode 4 deals with all students and teachers (except Irina, Kanzaki, Hazama, Takebayashi, Hara and Ritsu in the manga; their code-names are only revealed on Volume 11 extras) having to refer to each other by embarrassing code names for the entire day.
  • Combat Pragmatist: Chapter 169 / Season 2 Episode 22 shows just how far the entire class has come in this regard. During their final ascent in their attempt to save Koros-sensei, they come up against Craig Houjou, leader of the mercenary group who rounded them up earlier after the government decided to kill Koro-sensei, who's advertised as being "three times stronger" than Karasuma. Several chapters are spent building him up into a combat beast, and the fight begins with his internal monologue explaining how taking off his glasses is his psychological trigger to improve his combat skills... except that 3-E doesn't give him a chance to do that. They bombard him with coordinated attacks from the very beginning and don't give him a single chance to psyche himself up, culminating in being taken down with a Nagisa/Karma clap-and-kick combo. The latter even lampshades that Houjou would have wiped the floor with them in a fair fight.
  • Comes Great Responsibility: During one Le Parkour practice, Okajima and Kimura accidentally injure Matsukata, an elderly schoolteacher, putting the confidentiality of their mission in jeopardy. As punishment, Koro-sensei bans them from studying for their second midterms, instead assigning them to work at a preschool Matsukata runs. Sure enough, they perform worse than last term's finals except Karma (who still finished at second behind Asano Jr.), instilling in them a fairly harsh lesson about their responsibility as assassins.
  • Damsel in Distress/Distressed Dude: Happens to the class in the middle of the Reaper arc.
  • A Day in the Limelight: Due to the series's Loads and Loads of Characters issue and the fact that Nagisa, Kayano and Karma tend to get the most focus, the majority of the students don't stand out that much. Individual students do get focus chapters every now and then.
  • Demoted to Extra:
    • Happens a lot during the Assassination Island arc. First, ten students — Okajima, Mimura, Maehara, Sugino, Hazama, Kurahashi, Nakamura, Hara, Kanzaki and Muramatsu — were poisoned, while Okuda and Takebayashi stay behind to tend to them, leaving only fifteen — Nagisa, Karma, Kayano, Chiba, Hayami, Terasaka, Yoshida, Sugaya, Fuwa, Isogai, Kataoka, Okano, Yada, Kimura and Ritsu — for the infiltration of the Fukuma Palace Hotel. Koro-sensei suffers from Deus Exit Machina, sidelining him from most of the action. Once inside the hotel, Irina splits off from the group to distract the reception guards, and Karasuma is demoted to being The Load due being exposed to an assassin's knockout gas.
    • The entire class gets demoted to extra in the middle of the Reaper arc after they are captured and held hostage by the "Reaper".
  • Don't You Dare Pity Me!: The kids find themselves offended in Chapter 166 at being pitied by people who have no idea what they had gone through and are making assumptions.
  • Downplayed Trope: Generally speaking, the students of Class 3-E tend to have more subtle characterization than that is typical of shounen leads, possessing a few unique traits that stand out strongly. This doesn't mean that their characters are simplistic, they merely exhibit various tropes in a way that is weaker than usual in fiction. In turn, this actually makes them seem more like real people than what one is typically used to seeing in fiction.
  • Everybody Cries: After Koro-sensei is killed.
  • Everybody Hates Math: Math is the most common weak subject in the class, with eight students listing it as their weakest. Besides this, six are bad in Japanese, four in Science, four in English, three in Social Studies, and Terasaka in multiple subjects (to the point comparisons with Naruto Uzumaki have been made). Doing the math, only Karma lacks any weak subject, and is only in 3-E for a different reason.
  • Fantastically Indifferent: After you've been drafted to assassinate a Mach 20-moving, super-teaching eldritch smiley, your surprise may become somewhat miscalibrated. For example, after seeing someone casually walk straight through a wall, you may think "Use the damn door!" instead of "How did he do that!?" Granted, they expected an eccentric transfer student after they heard what Ritsu, the other "eccentric" transfer student, had to say about him.
  • Heroic BSoD: After Class-E learned of Koro-sensei's origins, they became afraid of killing the one person who helped them with their intellectual and emotional development. Their despair was so bad nobody made plans to assassinate him during the winter break.
  • Home Field Advantage: In Chapter 168, Class 3-E goes up against a squad of highly-trained and experienced elite soldiers/assassins who captured them effortlessly only a couple of chapters earlier and, by every other measure, would have crushed them just as effortlessly in any other situation had they not been fighting on their home turf, the mountain where they have spent an entire school year hunting, playing, and studying with a superhuman being. As a consequence, they end up being curb stomped mercilessly (the fact that Karasuma secretly fed them information as well as misled the soldiers into a false sense of security also helped).
  • A House Divided: In Chapter 142 / Season 2 Episode 17, after learning about Koro-sensei's past, the class was divided as to how to deal with him, culminating in a brief scuffle between Nagisa and Karma after the latter got annoyed at the former's self-deprecatory habits. To avoid a schism, Koro-sensei suggested that they hold a war game using paintball firearms and color-coated anti-sensei knives to help them make a final decision. On the "blue" side, which wanted to find a way to prevent Koro-sensei from exploding, are Nagisa, Kayano, Sugino, Kanzaki, Okuda, Kataoka, Isogai, Maehara, Yada, Kurahashi, Takebayashi, Fuwa and Hara. On the "red" side, which wanted to honor his stated wish to be killed, are Karma, Nakamura, Terasaka, Muramatsu, Yoshida, Hazama, Itona, Chiba, Hayami, Okano, Kumiura, Mimura, Okajima and Sugaya. Ritsu, meanwhile, remains neutral, creating her own "white" side. Ultimately the "blue" side won after Nagisa chokes Karma to submission; nevertheless the fact that the duel ended with neither boy "tagging" each other out made it easier for the whole class to come around the winning decision.
  • Informed Flaw: Class 3-E is supposedly composed of Kunugigaoka's worst students, but plenty of them seem reasonably intelligent. As it turns out, they simply had the misfortune of being the bottom 5% by Kunugigaoka's borderline-sadistic standards, and also tend to have skewed aptitudes (for example, Okuda is good in mathematics and science, but has failing grades in Japanese). Then there's Karma and Isogai, who were demoted as a disciplinary action, while Kataoka, Hayami and Chiba spent so much time helping other students that their grades dramatically slipped. On top of that, later chapters show that the teaching methods used by most of the faculty are geared towards students who are able to learn via memorization and note-taking, while ignoring other methods of learning. Koro-sensei, who is willing to customize his curriculum to capitalize on his students' strengths and weaknesses, gets far better results (though being able to do everything at Mach 20 also helps).
  • Keep the Reward: Played with. After they finally assassinate Koro-sensei, the government gives them reward money as promised. However, the class (some rather reluctantly) only keep a small portion for themselves to continue their education, donate some of it to their friends, buy back their campus and the surrounding mountain area, and gave the rest back to the government as gratitude for helping with their education.
  • Kill the Ones You Love: At the end of Chapter 177 / Season 2 Episode 24, the students finally kill Koro-sensei at his behest, partly as their final graduation test, partly to signify the completion of his promise to Aguri to help them become better people, and partly to spare him the indignity of being blasted to oblivion with a Kill Sat. Unfortunately, by that time they had already grown very close to Koro-sensei, who not only helped them develop intellectually, physically and emotionally, but also showed them the love and warmth denied to them by the rest of the school, so understandably all of them break down crying over what they had done.
  • Knife Nut: They are all trained in the use of Anti-Sensei knives.
  • Last-Name Basis: Everyone is called by their last names, with the exception of Nagisa, Karma, Ritsu and Itona, while Irina is commonly known as "Bitch-sensei".
  • Loads and Loads of Characters: At the beginning of the series, we have 26 students and their homeroom teacher. Later on, Karasuma and Irina enter as auxiliary teachers, and still later, Ritsu and Itona enter as transferees. Because of this, it's really hard to focus on one of them for a period of time, and even the main trio — Nagisa, Kayano and Karma — can fall into the background at times.
  • Mugging the Monster:
    • Whenever one of the regular students try to bully someone from 3-E it never ends well for them. They're lucky if they only end up fleeing in fear for their lives.
    • Not just fellow students at the school. Do not try picking on the seemingly "weak" tourists simply because you're bored delinquents out to have a bit of fun.
  • Mundane Utility: Their assassination skills are very useful in the School Festival games.
  • Named After Somebody Famous/Shout-Out Theme Naming: Most of the students' surnames are taken after those of several members of The 47 Ronin. However, many of the characters have altered names, either in how they are read or what kanji are used to write them. This may be a further reference to the oldest fictional versions of the story, which were written in a time when plays depicting current events were censored. To avoid that, the plays based on the story used different names and a different time period. Okuda, Muramatsu, Yoshida and Itona have two namesakes, and Hazama has three, while (Nagisa) Shiota, Chiba and Maehara are derivatives of, respectively, Ushioda, Senba and Maebara. Ritsu, meanwhile, is partially named after Oishi Riku, wife of Oishi Yoshio, leader of the Ronin.
  • Nightmare Face: Sometimes, the students mimic Koro-sensei's regular face whenever he and they have a "sinister" plan in store for somebody.
  • Ninja: Thanks to their training, they possess ninja-like stealth techniques like "nanba" (a way of walking aimed to avoid excess movement and noise) and can climb up sheer cliffs with ease.
  • No Pronunciation Guide: Many characters had the kanji for their names released without the correct reading specified for a long while. As of Volume 5 all readings are confirmed, but some websites still list them by the translator's early guesses.
  • The Only One Allowed to Defeat You:
    • Karma individually takes up this resolution after his introduction.
    • The students collectively come to this decision after Itona almost kills Koro-sensei, as they feel it's not "right" for a stranger to be allowed to kill their teacher, though they eventually let him once he was admitted into the class.
  • Ragtag Bunch of Misfits: The fate of the world rests in the hands of a classroom full of quirky, academically inferior middle-school students.
  • Shipper on Deck: Everyone in the class is rooting for Karasuma/Irina, except Kurahashi, who has a crush on the former and can be seen crying in the background whenever they make progress.
  • Ship Tease: Some of the interactions between the students can be interpreted in this light. This becomes clearer with Koro-sensei's "Couple Setup" plan, which pairs the Class in boy/girl groups in a test of courage, based on their interactions. The effort was largely fruitless, to his dismay. Matsui himself would later even sink some of them in the Roll Book Time, revealing their feelings for other classmates, or that the set pair have "no special feelings" for each other. The known pseudo-couples are:
    • Nagisa/Kayano: They have the most visible interaction among the student pairings, while Kayano is implied to have a crush on Nagisa. Then there's the Cooldown Kiss between them, and while their status as of the epilogue remains ambiguous, Kayano's body language implies that she may be pregnant, even as she tries to deflect Hara's questions about her and Nagisa.
    • Karma/Okuda: The latter doesn't find Karma scary (unlike most of the other girls), while the former admits that he is interested in Okuda mostly because of her apothecary knowledge. The manual even claims that out of all the females in the class, Karma feels the most comfortable around Okuda, enough to allow him to drop his guard around her.
    • Sugino/Kanzaki: Sugino has a crush on Kanzaki, though his plans to impress her tend to fail and she continues to think of him as just a friend.
    • Chiba/Hayami: They are the best marksmen in 3-E and appear together most of the time, especially in the Assassination Island arc. They also celebrate their victory against Gastro by crossing their arms together. The Roll Book time chart even reveals that they they have been on dates before.
    • Sugaya/Nakamura: It is not known why Koro-sensei paired them.
    • Maehara/Okano: Okano has a crush on Maehara and is often annoyed at his playboy tendencies. Their interactions just scream Belligerent Sexual Tension.
    • Okajima/Kurahashi: Also unknown, but both have A Day in the Limelight in the same chapter.
    • The delinquent group of Terasaka, Muramatsu and Hazama.
    • Isogai/Kataoka: Both serve as Class Representatives, are kind and helpful, have been sent to 3-E for other reasons than overall academic incompetence, and during the Valentine's arc, not only does Kataoka give Isogai bulk chocolates from a convenience store as gift for his younger siblings, but she also reveals that they are trying for the same public high school.
    • Karasuma/Irina: The only adults besides Koro-sensei. Notable for having to largest amount of actual subtext between them. This becomes so obvious the whole class once made a plan to help the latter confess. As of the epilogue, they are now married.
  • Slobs vs. Snobs: The slobs to Class 3-A's snobs.
  • Spotlight-Stealing Squad:
    • Nagisa, Kayano and Karma are the students who get more exposure than the rest of the class, though they are occasionally joined by Sugino and Okuda. Even when the focus shifts to other characters, at least one of the three will appear in a prominent way.
    • Both Karasuma and Irina become this in the middle of the Reaper arc.
  • 13 Is Unlucky: Judging by the school roll shown in Chapter 11 / Season 1 Episode 5, on paper Kunugigagoka has four sections per year, for a total of twelve. This technically makes Class 3-E the "phantom" thirteenth section, befitting its reputation as the dumping-ground for the school's worst of the worst.
  • Thou Shalt Not Kill: Anyone who isn't Koro-sensei is off-limits to them, though it's not like they want to kill anyone else in particular.
  • Took a Level in Badass: As a result of the assassination training they have to undergo, all the students have taken some levels in badass. And they won't stop.
  • Troubling Unchildlike Behavior: They are tasked with a killing their own teacher, and instead of displaying fear or hesitance, they show great enthusiasm. Even more disturbing is that even after they've bonded with him, it didn't dull their purpose a bit. Granted, the fact that their target is not human may be a factor in this behavior, but still, as Karasuma mused, this is not normal:
    "A group of junior-kids keyed up about assassination. Strangest class ever."
  • True Companions: It took awhile but the whole class makes up a tightly knit Badass Crew. They really care about each other and get along well, and will endure great lengths to protect or avenge their companions.
    • The Assassination Island arc is where their bond really begins to shine. After ten of them of are poisoned with a deadly virus, the mastermind Takaoka demands Koro-sensei, Kayano, and Nagisa in exchange for the antidote. Rather than handing over two of their classmates and their teacher, the remaining seventeen, plus Karasuma and Irina, instead elect to leave two of them behind to take care of their sick friends while the rest infiltrate the hotel where the trade-off was supposed to take place and steal the antidote back. During the infiltration, they keep on going despite the increasing danger of the situation (including facing off against three pros), not a single one of them thinking of stopping or going back. Then, before the start of Nagisa's second duel with Takaoka, two of them try to sneak up to help him and only stop because Takaoka threatened the only remaining vials of the antidote — and even then, after Takaoka starts giving Nagisa a No-Holds-Barred Beatdown, many of them still consider interfering anyway because they can't bear to see one of their friends hurt like that.
    • Even after the civil war game, they patch things up as they unite around Nagisa's decision to save Koro-sensei, though ultimately they reluctantly comply to his wish to be given a dignified death. The epilogue reveals that seven years down the road, they are still in contact with each other.
  • Unconventional Learning Experience: Invoked by Koro-sensei, who intends to use the hit against him to give his students an opportunity to apply the knowledge he taught them, so they study things they otherwise wouldn't and learn the material better.




Voiced by: Masaya Onosaka (Japanese, vomic), Tomokazu Seki (Japanese, event anime and J Stars Victory VS), Jun Fukuyama (Japanese, TV anime), Sonny Strait (English)

Portrayed by: Kazunari Ninomiya
Click here to see his human form 

"Let's have an assassination that will make people smile and puff out their chests with pride. Each and every one of you can do that. You are talented assassins with hidden strength. That is advice from your sensei, as a target."

A mysterious octopus-like creature who was responsible for obliterating 70% of the Moon, leaving it a permanent crescent and also currently plans to destroy Earth after teaching the class for a year, and the homeroom teacher of Class 3-E of Kunugigaoka Junior High School.

  • The Ace: Not only is he an amazing teacher, but with his powers, he can flawlessly perform pretty much any task in flying colors, even the most implausible ones. The yearbooks and personal guides he whipped up for his students before his death showcase this way better than words can.
  • Adorkable: Despite being unfathomably powerful, he's 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.
  • Affably Evil: For a being who wants to destroy the world, Koro-sensei doesn't act like it. Back when he was the original "Reaper", he was really polite and charming for a master assassin.
  • Animal Motif: The octopus. Like the animal, Koro-Sensei has several tentacles. He can also change his skin colour at will, which he uses both for communication and for camouflage.
  • Armor-Piercing Slap: In Chapter 95 / Season 2 Episode 6 he slaps the entire class not only because they injured Matsukata during a Le Parkour practice, but because they also tried to deflect responsibility. Karasuma does not report his action and pretends that nothing happened, even blaming himself for prematurely teaching them the skills without teaching them their responsibilities.
  • The Atoner: For both his failure to protect Aguri, his past as a professional hitman, and his inability to properly guide his apprentice, who betrayed him to the government and assumed his "Reaper" persona, Koro-sensei has decided to spend his last days teaching her students at Class 3-E to honor her dying wish of helping them become better persons, even as he takes to heart her lessons about what it means to love and look after someone.
  • Badass Adorable: He is so friendly, goofy and kind and often joins his students in their antics. Also no military in the world can kill this guy who also used to be the world's greatest assassin.
  • Badass Bookworm: Along with being a very knowledgeable educator, he makes quite a few nods to Shonen Jump, including wearing a Leaf Village headband one time, and firing a giant slingshot using the Gum Gum Slingshot.
  • Badass in a Nice Suit: When he and his disciple (the current "Reaper") did an infiltration mission — and was subsequently betrayed by the latter.
  • Badass Teacher: Koro-sensei is an extremely competent and protective teacher, who uses his inhuman abilities to teach and protect his charges. tyying to harm his students is an unwise move. In the past he was this to the current Reaper/God of Death, although Koro sensei only viewed him as a tool to expand his own successes.
  • Bad Liar: He's bad at covering up his weaknesses. While this may be partially intentional, it's also because as he became more of a tentacle monster he lost a great deal of his emotional control.
  • Bash Brothers: Together with Karasuma-sensei in the tag game.
    "The strongest creature and the strongest human. They're coming to attack us to give us more homework!!"
  • Beauty to Beast: Was quite attractive when he was still a human.
  • Being Tortured Makes You Evil: Briefly after he had broken out of his cell until Aguri snapped him out of it.
  • Because You Were Nice to Me: He became fond of Aguri because she was the first person to show him kindness and teach him what it meant to look after someone.
  • Berserk Button: The anti-matter project is this for him. Not the victims, but the scientists involved, especially Yanagisawa/Shiro
  • Beware the Nice Ones: He's usually the nicest teacher you will ever meet, but when someone threatens his students you better watch out.
  • Beware the Silly Ones: Normally, he's goofy and fun-loving until his students are in danger or it's time to get serious.
  • Big Good: Zigzagged. He is supposed to be Class 3-E's target because he supposedly will blow up Earth next March like he already did with the Moon. However, he is a great teacher and a kind, sensitive and respectful person who gets along with pretty much all his students and helps them and other people in every way he can, and his students' attempts on his life are more or less Played for Laughs. Ultimately the "Big Bad" part is subverted when it turns out that he really didn't blow up the Moon, while he is also actually an involuntary time bomb due to the antimatter cells implanted inside his body.
  • Big Eater: Combined with Sweet Tooth. Or anything junk-foody.
  • Birds of a Feather: His friendship with Aguri stems from the fact that they are both troubled young adults living in abusive conditions.
  • Bishōnen: His backstory reveals that he was actually quite the looker when he was still a human. Korosensei is capable of returning to his original form but never does it throughout the series.
  • Bizarre Alien Biology: Yes. Well, ish. He's born on Earth, he just doesn't look like it. From his color-changing face to his multi-purpose tentacles, with more quirks being revealed over time.
  • Blithe Spirit: For a creature who intends to destroy the world, Koro-sensei is an expert in making people change their ways for the better. Karma, Irina and "Red Eye" are all examples people whose lives improved through his charisma and wisdom.
  • Body Horror: It looks pretty painful when he shoots himself to prove a point. But especially his transformation looks outright terrifying looking at his arm being all messed up and fingers moving in all ways they shouldn't, and how he looks when he's rampaging throughout the facility he was tested in. One should be happy that he hid in the cave when the rest of his transformation happened.
  • Bunny-Ears Lawyer: Moon/planet-killing, manga-drawing, supersonic, perverted, but really good teacher, anybody?
  • Buxom Is Better: Koro-sensei loves big breasts, and often takes a shine to Irina. The flashback arc reveals that this originated from seeing Aguri in a tube-top that exposes her ample cleavage.
  • The Chessmaster: He's an extremely skilled strategist.
    • For example, in the "Robbers and Cops" tag game, he and Karasuma are the cops and have to tag the class within an hour, but Koro-sensei has the given handicap to be in "jail" until the last minute. The students underestimate his extreme skills, and they realize that his handicap is even his advantage, since nobody can tag out the "arrested" students as long he's in the "jail".
    • Even though Koro-sensei is easily tricked, he uses the moments where he's one-upped by his students to provide them with helpful advice. He teaches them how to evade Karasuma when they get out, implying that he might be deliberately falling for their tricks in order to give them more opportunities to gain experience and put his advice into action.
  • Characterization Marches On: Throughout the series, Koro-sensei undergoes a subtle, important shift in personality. Formerly the original "Reaper", the greatest assassin in his time, he slowly acclimated to the responsibilities of a teacher and to empathy itself, only recently instilled in him by Aguri Yukimura, a gentle young teacher assigned to observe him during his confinement. This is justified, because the "tentacles" have an emotionally reciprocal relationship to their host, being affected by and feeding into the host's emotional state. In late chapters, Koro-sensei states that he wanted to be "full of weaknesses, easy to get along with" and able to "touch even the weakest of things, protect them, and guide them". This from a guy who responded to a reckless assassination attempt by threatening the students' families (though this is probably just a threat to make them not repeat another suicidal assassination).
  • Cheshire Cat Grin: His signature smile never moves, even when he's talking.
  • Chivalrous Pervert: He doesn't hide the fact that he loves women with big boobs, but he also defends Irina from a group of perverts who were harassing her and is an all-around good person, aside from that destroying the world issue. He has limits in his hobbies. He owns a stash of dirty magazines, but he insists he doesn't go farther than mailing the editors out of devotion when he is framed for going on a panty raid.
  • Clark Kenting: When he wants to go out in public, he sticks a fake nose on his face, changes his skin color to a more normal tone, and puts on a wig. Amazingly, it works.
  • Color Coded Emotions: Physically so. Since Koro-sensei is almost always smiling, his emotions are read by his face's coloration and color pattern.
    • Yellow: Normal
    • Yellow with blushing cheeks: Very happy (usually, but not always, due to breasts)
    • Green and yellow stripes: Mocking contempt
    • Dark purple with X shape: Wrong answer face
    • Orange with circle shape: Correct answer face (Two circles for perfect scores)
    • Light blue: Sadness
    • Dark blue: Shock/fear
    • Red-orange: Angry
    • Pitch black: Extremely angry
    • Pink: Drowsy/relaxed
    • White: Poker face/bewildered
    • Blindingly-white glow: Pissed beyond all reason
  • Combat Tentacles: Comes with being octopoidal.
  • Combination Attack: He combines all his emotional energies and experiences into one supercharged blast against the Reaper. Koro-sensei kills the Reaper and permanently paralyses Yanagisawa.
  • Compelling Voice: He can whisper at high speeds in order to instill thoughts into people's heads. He does this to the class during winter break to make sure they keep up with their studies despite their troubles concerning his past.
  • Cool Teacher: He is a great teacher who is always there to motivate his students, protect them and have fun with them.
  • Cosplay: In the anime, each episode ends with Koro-Sensei dressed up as the character with the most focus in the next episode, such as Karma or Irina. In the manga, each installment's title page has him in some kind of costume, some of which have generic themes but some of which are pop-culture characters (eg the class posed as in the iconic class photo image from the Battle Royale franchise, with Koro-Sensei as Kitano from the film).
  • Crazy-Prepared: Dear Lord, but is he? The guidebooks he produces are just one (big) example.
    • When he faces Asano Sr. with grenade-trapped textbooks, he reveals he has memorized every textbook in Japan.
  • Dark and Troubled Past: The man who became Koro-sensei was an orphan from a brutally corrupt slum in an unnamed tropical country, who learned survival skills at a very young age until he became the legendary assassin simply known as the "Reaper", until his disciple sold him out to the Japanese government, which proceeded to conduct antimatter experiments that would turn him into a Living Weapon. During this time he met Aguri, who helped him rediscover his humanity with her tales of her experiences as a middle-school teacher. Unfortunately, after an experiment to test the effects of aging on antimatter in a mouse resulted in the destruction of 70% of the Moon, head scientist Koutarou Yanagisawa decided to have him killed before he exploded next year. When Aguri warned him, he went on a despair-filled rampage in an attempt to escape, only to fail to protect Aguri from the tentacle of an antimatter container. With her last breath, she asks the heavily mutated Koro-sensei to look after her students.
  • Deface of the Moon: He blew up most of it prior to the story's beginning. Except he actually didn't.
  • Didn't Think This Through: Koro-sensei's habit of offering a handicap in assassinations as motivation for his students typically results in this reaction from him.
  • Disappears into Light: He dissolves into countless particles of light after his students finally assassinate him.
  • Drama-Preserving Handicap: He isn't allowed to injure any of the students or staff as a condition to be allowed to teach to class 3-E. Never mind the human students, even Itona wouldn't stand a chance against him if he were willing and able to retaliate.
    • During the Assassination Island arc, the students' attempted assassination of him forces him to use his ultimate defense, which renders him unable to move for twenty-four hours - just as several of his students are affected with a deadly virus, with the only antidote in the hands of someone that wants to kill him. This forces Karasuma, Irina and the healthy students to risk their lives to get the antidote.
  • Dreadful Musician: Weakness #27 — He's tone deaf. His dreadful singing is powerful enough to shatter concrete.
  • Eldritch Abomination: Averted. Even though Koro-sensei looks like a freaky alien octopus, he states that he was born and raised on Earth. As what human, animal, vegetable, or mineral, it is anyone's guess.
  • Et Tu, Brute?: Back when he was the "Reaper", he was sold out to the authorities by his disciple, who took on his name and reputation as his own.
    • Invokes this trope in a hilarious way when he's accused of stealing the bras of big-breasted women in town; Isogai tries to defend him as a "normal pervert", but as he starts listing down Koro Sensei's perversions, even he tells him to just "turn himself in".
  • Even Evil Has Standards: Koro-sensei is not pleased when one of his students' collaborative attempt at killing him almost injures one of their own.
    • When the students of another school kidnap Kayano and Kanzaki, he destroys said students for daring to touch his students.
  • Evil Laugh: As the "Reaper", when he overwhelms Koutarou Yanagisawa and his soldiers in his flashback story.
  • Evil Overlord: His role in the Koro-Sensei Q! Spin-Off. That said, he also acts as 3-E's teacher, much like in the original version.
  • Exact Words: He's going to destroy the Earth come March, but until then, he's going to be Class E's teacher. After all, he's going to blow up on March 13 unless he is killed first.
  • Excuse Me While I Multitask: When people try to kill Koro-sensei he's usually doing other things, such as meticulously trimming his attackers' eyebrows or giving a fighter jet a polish in midair. When helping his students study for the midterms by flashing between them so fast he leaves an afterimage, he is also resting on a chair outside the classroom.
  • Explaining Your Powers to the Enemy: Subverted. When he bothers to say anything at all, he only tells the basics, and often leaves out key details, like the fact that his mucus protects him from his weakness to water.
  • Extreme Omnivore: Aside from his habit of flying around the world to enjoy cuisines from different countries, he has been seen eating pens, tissues, knives, sodium hydroxide, aqua regia, plastic explosives, you name it.
  • Famous Last Words: "Congratulations on your graduation...", apparently whispered to Class 3-E after they finally kill him.
  • Faustian Rebellion: Before his first day of class, he uses his newly-gained powers to rip the scientists that caused them a collective new one.
  • Flash Step: Koro-sensei has a top speed of Mach 20. During his introduction to Class 3-E, he easily dodges Karasuma while meticulously trimming his eyebrows. When attacked by state-of-the-art fighter jets, he gives them a midair waxing. When attacked by Isogai, Yada, Mimura, Maehara, Okano and Kataoka with knives, he disarms all of them, then replaces the knives with tulips without them noticing.
  • A Form You Are Comfortable With: The first chapter makes it clear that his current appearance is not his true form. Sans tentacles, his shadowy true form seems human-like. Averted at the revelation that the "tentacles", referring to all the artificial components of his body, are altered by and alter the host's emotions. He began having minor but uncontrollable changes to his expression and limbs during the experiments, although his form remained stable until his Roaring Rampage of Revenge; it may be impossible for him to control his shape enough to play this trope straight.
  • Fragile Speedster: By his own admission, he's so physically weak that it would take just one person grabbing each of his tentacles to pin him down. Good luck grabbing his tentacles, though.
  • Freudian Excuse: He became an assassin due to a horrific childhood, same as Irina.
  • Fridge Brilliance: He goes through an In-Universe example when Karma discusses his plans for the future. At first, Koro-Sensei was iffy about a career as a bureaucrat being appropriate for someone like Karma, but, after Karma explained his logic behind his decision, Koro-Sensei took it back, and conceded that it was perfect for him.
  • Friendly Enemy: To his students and his coworkers.
  • Gadgeteer Genius: Has extensive skill and knowledge with machines and electronics. He was able to upgrade Ritsu's capabilities for a relatively cheap sum of money and also built a custom motorcycle with a frame made of wood.
  • Game Face: When his face turns pitch-black, it means he's very angry.
  • Genius Bruiser: He is impossible to defeat in single combat, and he teaches every single subject at once without being challenged in any way.
  • Go Out with a Smile: Fully expects to do this. And he does, smiling proudly to his class as he bids them a final farewell as they assassinate him.
  • Gone Horribly Wrong: A super-powerful artificial creature, created to be the world's savior, now on course to destroy it in less than a year.
  • Guile Hero: For all his power, he almost always solves problems with trickery rather than brute force alone, often to the effect of bettering his opponents.
  • Healing Factor: Koro-Sensei, amongst other abilities, has the power of regeneration. Even if he gets hit with Applied Phlebotinum weapons, unless his body is almost completely destroyed, he'll recover in seconds.
  • Heel Realization: After Aguri's sacrifice, he realized that for all his gifts and skills, he'd never tried to use them to help people, only to kill.
  • Helping Would Be Kill Stealing: Though he may guide and coordinate them, he lets his students handle problems on their own whenever they're capable of it, which they usually are.
  • Hiroshima as a Unit of Measure: Every few chapters Koro-sensei is given a character introduction that includes one of these comparing to his ability to travel at mach 20. Some are fairly sensible (651.241 times as fast as Usain Bolt's 100-meter dash) while others are ridiculous (133,333.33 times faster than the speed of falling sakura petals).
  • I Let Gwen Stacy Die: As he destroyed Yanagisawa's lab in his escape, Aguri tried to stop him with a Cooldown Hug, only for her to be fatally injured by the tentacle of an antimatter container. He became the teacher of Class 3-E to fulfill her last wish.
  • I'll Kill You!: Koro-sensei threatens to kill the families of Class 3-E if any of them endanger one another during an assassination attempt, though from what is later learned about his personality, he was almost certainly bluffing.
  • Immune to Bullets: As Irina found out, he cannot be hurt by lead bullets, as the bullets literally melt inside his body.
  • Informed Attribute: He is supposedly an evil monster who intends to destroy the world, and only hasn't done so yet because it would be boring... or so the narrative says. He actually acts like a kindly sage, helping everyone around him improve themselves. The dissonance is so extreme it's hard to imagine that it's not Foreshadowing some kind of reveal. And indeed, he's far from evil — he just cannot help that he will destroy the world if he's not killed, as the antimatter in his body will explode when he dies naturally. He wants to be killed and wants to help Class 3-E to save the world and fulfill Aguri's dying wish.
  • Invisible Streaker: Played for Laughs; Koro-sensei uses his invisibility to avoid scaring a group of train passengers during a class trip, but his students point out that a random set of floating, disembodied clothing is just as unsettling.
  • Invisibility: A rarely used ability, and his clothes and anything he's carrying will still be visible. He makes himself transparent by changing the color of his skin to match his surroundings like a chameleon.
  • Involuntary Shapeshifter: Koro-sensei transformed several times after drinking hazardous chemicals. In a more serious note, after Aguri warned him of his impending death and that Yanagisawa was more than willing to kill him to preempt what he has done, he was not able to control his emotions and let the tentacles consume him.
  • Jerk with a Heart of Gold: Koro-sensei wants to destroy the world and constantly teases his students for not being able to kill him, yet he always makes sure they get good grades and successes in life. As it turns out, he had no intention of destroying the world, but the antimatter cells in his body will make him do so unless he is killed first, while his job as teacher was part of a promise he made with the dying Aguri to help her students become better people.
  • Ki Manipulation: Shown in chapter 84. What's interesting is that he initially didn't know he could do that; he learned it during the Island arc.
  • Killed Off for Real: By his students at the end of Chapter 177 before he is killed by the government.
  • Kryptonite Factor: A rubbery material that is not described beyond being "special" and able to disrupt his cells on contact. It can be fashioned into knives, BB pellets or clothes, and is apparently available in abundance.
  • Living Weapon: Yanagisawa injected him with antimatter as part of experiments to turn him into Japan's One-Man Army. However, when a similar project on the effects of aging on a lab rat destroyed 70% of the Moon, Yanagisawa decided to hastily can the project, even if it means killing Koro-sensei, who only narrowly escaped through Aguri's warning and, ultimately, sacrifice.
  • Lovable Sex Maniac: He loves big-breasted women and enjoys reading porn magazines, yet he's still a funny and caring teacher.
  • Love Redeems: He used to be the "Reaper", the greatest assassin in the world. When he met Aguri, her kindness made him understand what it meant to watch over others. He almost lost himself again after hearing he would die next year, but Aguri's death and her final wish made him decide to spend what little time he has teaching Class 3-E both as fulfillment of her dying wish and as his atonement.
  • Major Injury Underreaction: He casually blows or slices off his own tentacles, sometimes several at once. Supposedly this causes emotional disturbance that slows him down for a while afterwards, but that's still way less of a response than such injuries warrant. Of course, he can regrow his tentacles after a few seconds.
  • The Matchmaker: A chapter has Koro-sensei pairing up the students into boy/girl pairs of his choosing to explore a cave in a poor attempt to cause some romantic tension between them. He even refers to the scheme as Couple Setup. Somewhat subverted in that he doesn't actually want them to get together as much as he wants juicy romantic gossip that he could poke fun at them for and write a novel about later.
  • Meaningful Name: As mentioned under Punny Name, his nickname is a pun of "korosenai" ("unkillable" in Japanese) and "sensei".
  • Mundane Utility: This is practically the entire basis for his character. Koro-sensei boasts an enormous number of extraordinary abilities and he uses nearly every single one of them to be a better teacher. Able to fly at Mach 20? Use your speed to visit different countries during lunch breaks in order to sample local cuisine. Able to create dozens of visual clones through sheer speed? Use them to divide your attention to give every single student simultaneous one-on-one instruction. Able to regenerate from even severe injuries in a matter of seconds? Use the ability to remove limbs to motivate your students to perform better on the next test.
  • My Greatest Failure: Aguri's death led to his Heel Realization and motivation to teach Class 3-E. In the end, he also admits he was an improper teacher to his apprentice, who betrayed him and later became the second "Reaper".
  • My Greatest Second Chance: When Aguri's younger sister Akari/Kayano is killed at the finale, Koro-sensei has the knowledge and preparation necessary to save her life this time. After stopping his rampage, he tells his ex-apprentice that were they to meet in the afterlife, he would Raise Him Right This Time.
  • Mysterious Past: The beginning chapters already throw multiple question marks on his true identity, such as his motivations to become a schoolteacher and flashbacks to a dying woman who made him swear a promise. The latter half of the series ultimately reveals that he was a test subject for an antimatter infusion experiment gone horribly wrong, and that the woman was Aguri, his first love, who encouraged him to spend his last days teaching Class 3-E.
  • Neat Freak: Koro-Sensei has a bit of a hang-up with cleanliness. As mentioned before, he meticulously trimmed an assailant's eyebrows and waxed a fighter jet in midair.
  • Nice Hat: He always wears a mortarboard that never falls off... and also looks amusingly small.
  • Nigh-Invulnerability: He is able to withstand fire from multiple high-caliber machine guns at once. Apparently, the only things that can seriously harm him are the special anti-sensei material and other beings similar to him, like Itona.
  • No Sense of Personal Space: This seems to a part of being a Psychologist Teacher.
  • The Nose Knows: He has an incredible sense of smell despite not having a proper nose.
  • Not the Fall That Kills You: Averted, though it involves sudden acceleration rather than deceleration. Koro-sensei cannot accelerate as quickly as he normally would if he has to catch or carry a normal human being because their bodies couldn't handle the physical stress.
  • Omnicidal Maniac: He plans to blow up the Earth, along with everyone living on it. Eventually subverted, as it turns out that he has no control over the antimatter cells within him, which will explode on March 13 unless he is killed first.
  • One-Man Army: He's so powerful entire fleets have been sent to go after him, mostly to no avail. In fact, his backstory reveals that he brought a ten-year-long conflict at a country (presumably his homeland) to a standstill in a space of a week by killing two dozen members of the top brass.
  • Only a Flesh Wound: Losing limbs may affect his speed, but having two gaping holes shot through his head seems to have no effect on his ability to think at all.
  • Only Known by Their Nickname: When his students asked his name, he said he didn't have any name he could tell them, so they could call him whatever they wanted. Kayano then decided to call him "Koro-sensei". He never had a real name, since he grew up on his own in the slums in an unnamed tropical country. Before becoming "Koro-sensei", he was known as "Reaper.
  • O.O.C. Is Serious Business: When the goofy, fun-loving Koro-sensei becomes angry and breaks out his Game Face, prepare for this lighthearted manga to turn very serious, very quickly. He lampshades it after his first battle with Itona, when he turns embarrassed after one of his rare bursts of anger, lamenting that it will ruin his reputation as a gag character.
  • Papa Wolf: Attack or bully his students and Koro-sensei will make sure you pay for it.
  • Paparazzi: Where there's potential for spicy gossip (in particular Ship Tease material), Koro-sensei is at hand to take notes and/or photographs.
  • Perpetual Smiler: He rarely breaks his constant smile, even when he was being experimented on by Yanagisawa, or as he allows his students to give him a dignified death.
  • The Promise: Koro-sensei is teaching the students in his class as a promise he made to someone. As he once put it, teaching all of his students seriously is much more important to him than the end of the world. He made the promise to Aguri Yukimura, Kayano's older sister and the class's previous homeroom teacher.
  • Psychologist Teacher: Goes to extreme lengths to make sure that his students are able to resolve their own personal problems.
  • Punny Name: Due to a lack of a name at the beginning of the series, Kayano came up with Koro-sensei as a pun with the Japanese words "korosenai" and "sensei" ("unkillable teacher").
  • Real Men Wear Pink: He knows how to groom eyebrows, and he does so quite impeccably.
  • Reasonable Authority Figure: Koro-sensei doesn't seem like this at first, but is soon revealed to be one.
  • Red Baron: When he was human, he was known as the "Reaper", the world's greatest assassin.
  • Red Eyes, Take Warning: When his face changes to black he drops all his usual goofy characteristics and becomes seriously menacing
  • Remember When You Blew Up a Sun?: He brags about being the one who blew up the Moon. Except he actually didn't.
  • Screams Like a Little Girl: His voice gets quite high when he's splashed with water.
  • Secretly Dying: In Chapter 133 he reveals he's going to die anyway on March 13 even if no one manages to assassinate him.
  • Self-Duplication: He can move so fast he can make selectively tangible afterimages. Chapter 12 shows him making one for every student in the class to personally focus on their weak subjects. He even leaves one outside to rest from all that work.
  • Shipper on Deck: He, and the rest of Class 3-E, ship Karasuma/Irina.
  • Signature Laugh: "Nurufufufu."
  • Silent Scapegoat: He isn't the one who blew up the Moon as he claims — it was a lab rat transplanted with antimatter generating cells, sent on a satellite to the Moon as part of an experiment to test the effects of aging on the cells which had Gone Horribly Wrong.
  • Slasher Smile: His Game Face color: Pitch Black.
  • Smug Super: Well, yes. No chapter is missing without him boasting that he's unkillable.
  • Star-Crossed Lovers: With Aguri Yukimura, Akari/Kaede Kayano's older sister and previous homeroom teacher of Class 3-E.
  • Stone Wall: His Ultimate Defense technique takes this to an extreme: He releases most of the energy and matter in his body in an explosion that blows away nearby enemies, then condenses said energy and matter into a ball-shaped barrier around him. This makes him absolutely invulnerable, but leaves him as a talking head for 24 hours.
  • Street Urchin: As a child, he grew up on his own in a brutally corrupt slum in an unnamed tropical country. Due to his violent background, he became an assassin eventually known as "Reaper".
  • Super Drowning Skills: Because his body is sponge-like, they absorb water quickly, weighing him down on water.
  • Super Mode: His ultimate defense form makes him completely invulnerable. Subverted, since he is also immobile in this form for 24 hours, and he is afraid that somebody could send him on a rocket into outer space (though he admits that would be unrealistic, since sending him to space would take too long). This gives his enemies the opportunity to kill him with a plan, and he can't do anything to avoid it.
  • Super Speed: Koro-sensei, as previously mentioned, can move at Mach 20. He eats shaved ice he personally gathers from the North Pole. He eats Chinese food on his lunch break... in China.
  • Suspiciously Specific Denial: In chapter 43.
    Koro-sensei: "...I mean, I just don't really feel like swimming. And it's not like my tentacles get all bloated underwater and I can't move or anything."
  • Sweet Tooth: He loves sweets and is usually seen eating them.
  • Tall, Dark, and Handsome: When he was a human, he was a really handsome black-haired man.
  • Terrible Artist: One of his minor weaknesses, he can only do simple art. And he still challenges Sugaya, the best artist in class, to making henna tattoos.
  • This Loser Is You: The Season 2 Premier, and Chapters 74-76, in which Koro-Sensei attempts to play Shipper on Deck for his students, ends up being a Take That! to real life shippers. His students end up finding it creepy that he's so interested in trying to pair off a bunch of kids.
  • Together in Death: In the epilogue, Kayano imagines that somewhere he and Aguri are now watching over Class 3-E even after seven years.
  • Tombstone Teeth: Koro-sensei sports a brick-toothed grin that only adds to his cute-but-creepy Smiley Face-with-tentacles appearance, and is the cherry on top of him being a borderline Eldritch Abomination with enough power to destroy the planet. When he gets angry, however, his teeth turn into fangs. Even when he was human, he'd sport a brick-toothed grin for comical effect when he was being perverted.
  • Too Powerful to Live: He is this to the entire world. Even though his chances of actually destroying the world are less than 1%, world governments refuse to even consider the possibility of letting him live. Even discounting that, his abilities are so game-breaking he can rewrite reality as he pleases. This is why all later examples of beings with his power were deliberately given either critical weaknesses or shortened lifespans.
  • Tragic Keepsake: His necktie was a birthday gift from Aguri Yukimura, the woman he loved and who gave him a birthday.
  • Tragic Monster: He's about to destroy the Earth just like he did with the Moon... and it's not completely of his own free will. For one, he's actually taking the blame for an antimatter-infused lab rat destroying the Moon, while the same cells in his body have turned him into a walking time bomb.
  • Tranquil Fury: When Kayano was impaled by Number Two, he barely uttered a word or raised his voice despite his absolute fury. He simply concentrated all his power into one final, devastating attack and made short work of Shiro and Number Two. It's less tranquil in the anime, where he emits a roar of uncontrollable rage for several seconds as he turns white.
  • Villain Protagonist: He destroyed the Moon and plans on doing the same to Earth in a year. Until then, he's going to fulfill a promise to be a teacher, and he's going to do it perfectly. As such, based on what we know, the only reason people targeting him can be considered bad guys is because they don't always care about not putting Class 3-E in danger. Ultimately this is turned on its head in later chapters, when it was revealed that he actually didn't destroy the Moon (it was a lab rat), but he took the blame anyway, while teaching Class 3-E was him fulfilling his promise to the dying Aguri, and he actually wants to be killed before the antimatter cells inside his body destroy the world.
  • Was Once a Man: He originally was a fearsome assassin known as the "Reaper", until some government experiments turned him into what he is now.
  • Weaksauce Weakness:
    • Weak to water. Specifically, his body is sponge-like. Even a day with high humidity causes him to swell up comically. If he actually found himself immersed in water it would certainly get much worse and slow him down significantly. The mucus his skin releases can protect him from it, but it can be depleted.
    • The anti-sensei weapons are basically his Kryptonite, which is notable as it's completely harmless to normal humans.
  • What Could Have Been: In-Universe, Aguri thinks that had he not grown up in a Wretched Hive, most of his personality quirks or weaknesses (other than his inability to swim) would've likely been expressed as a human being as well.
  • Why Am I Ticking?: The real reason he will destroy Earth on March 13 is because the antimatter-generating cells Shiro/Yanagisawa put in his body will make him explode.
  • Willfully Weak: He asked his tentacles to make him weak, so he could become a teacher that could easily get along with others and protect his students.
  • World's Best Warrior: He held that title alongside his disciple as the greatest assassin. After the transformation, he became the World's Strongest Man, but he wanted to be killed by his students.
  • Your Days Are Numbered: He is going to die in upcoming March 13 anyway, since his anti-matter generating cells will make him explode. Actually averted, in that the chance of instability and thus antimatter explosion decreases with increasing body size. For Koro-sensei, who is at least twice as large as a fully-grown human, the odds were ridiculously small to begin with, but drinking a certain chemical mix would reduce the chances to less than 1% (and that was the very formula that made his body as liquid way back in the beginning chapters of the series). The danger was never there, but world governments aren't willing to dismiss that 1%.

    Tadaomi Karasuma 

Voiced by: Kosuke Toriumi (Japanese, vomic), Junichi Suwabe (Japanese, event anime), Tomokazu Sugita (Japanese, TV anime), Chris Ryan (English)

Portrayed by: Kippei Shiina

"Hey. Wanna win? Step up your game — you've only got today."

An agent sent from Japan's Ministry of Defense to supervise Koro-sensei, while he also fronts as Class 3-E's P.E. teacher.

  • The Ace: Incredibly skilled in a variety of fields. While that amounts to nothing when you take into account that he's against a supersonic, unkillable octopus, his skills nonetheless make an invaluable asset when training Class E or going up against human opponents. This is exemplified in Chapter 106.
  • Amazon Chaser: He "likes" muscular, battle-ready women, though it's suspect if he realized they were asking about his ideal romantic type. Either way, it sucks for Irina. Luckily for her they get married.
  • Awesomeness by Analysis: Each student entry in the Roll Book Time contains his analysis on his/her strategic, leadership, execution, technique, reconnaissance and negotiations skills on a scale of 1 to 6.
  • Badass in a Nice Suit: It's practically a trademark.
  • Badass Teacher: One of the reasons why he's respected by his students. He's very protective of the Class 3-E's students, and will not stand for anyone physically or emotionally hurting them.
  • Bash Brothers: Together with Koro-sensei in the tag game.
    "The strongest creature and the strongest human. They're coming to attack us to give us more homework!!"
  • Blood Knight: Whenever he spars with his students, and even more during the freerunning cops and robbers game, he really enjoys himself. He also can't help himself when going up against the "Reaper" in Chapter 106.
  • Celibate Hero: He isn't as clueless to Irina's crush as he seems. He just thinks romance gets in the way of work. That is until the end of the series, where he's married to Irina.
  • Character Focus: Season 2 Episode 8 of the anime focuses on him trying to save Class 3-E from the God of Death.
  • Charles Atlas Superpower: In Chapter 106 he stops an iron beam and grabs a crossbow bolt with one hand each.
  • The Comically Serious: He mostly reacts to the hijinks around him, mostly courtesy of Irina, with an unflinchingly stern expression.
  • Cool Teacher: Despite his stoic attitude, all the students like him for his skills as well as his protective nature.
  • Drama-Preserving Handicap: He's incapacitated from gas to stop him from otherwise steamrolling Takaoka's goons. Combined with Koro-sensei's current immobility, the students were left to fend for themselves.
  • Everyone Has Standards: For all his stoic and professional demeanor, even Karasuma cannot help but be outraged at Kunugigaoka's discriminatory policies, as shown when he sees Nagisa being bullied by Tanaka and Takada.
    "This whole stupid (academic) system is a travesty..."
  • Face Palm: His reaction in Chapter 10 / Season 1 Episode 4 after seeing Irina make a walking PR disaster of herself with her insensitive comments on Class 3-E right to their faces.
  • Groin Attack: He finds an opening for a second and punches the God of Death in the groin.
  • Hey, You!: He refuses to call Koro-sensei by the name his students gave him. He either just calls him "You" or nicknames like "Target". Averted in Chapter 177 / Season 2 Episode 24, where he calls Koro-sensei by name for the first and last time as he allows himself to be assassinated by his students.
  • Hidden Depths: He is the most serious and straight-laced character in the series, yet Koro-sensei reveals that the main source of his inhuman strength is "the deep rage hidden in his heart".
  • Honor Before Reason: He decides that the lives of the students are worth more than a chance to kill Koro-sensei and proceeds to challenge the "Reaper".
  • Hot Teacher: Oh, boy. Just ask the Class 3-E's female students.
  • Ignore The Fanservice: Poor Irina. And sometimes, he even scolds her for being too hot.
  • Indirect Kiss: Irina does this with his napkin. Which he mistakes for a being new assassination technique.
  • Innocent Cohabitation: While the innocent part is debatable, Karasuma does invite Irina to live with him in order for her to leave the assassin lifestyle.
  • Knife Nut: Although not restricted to knives (or nuttiness), he's good with them and training others to use them.
  • Majorly Awesome: The movie has him wear the insignia of a JGSDF major on his uniform.
  • Mundane Utility: His methods as a P.E. teacher involve teaching his students knife-based CQC.
  • Mr. Fanservice: When he takes off his shirt to wrap around Irina's left arm as a cast after the God of Death caves in the ceiling on her, she suddenly spurts blood from her face. He believes that it was a head injury until she clarifies that the sight of his muscular body got her excited.
  • Not So Stoic: He tries so hard to maintain a professional demeanor, but considering the insanity of the situation he finds himself in, he can hardly go five minutes without getting visibly angry.
  • Oblivious to Love: Karasuma's main weakness is being "super dense", especially towards Irina's blatant overtures. Subverted when it's revealed he knew all along, but just doesn't return her feelings until he realizes how badly it affected Irina, and later extends an offer for her to work for the Ministry of Defense and subtly asks her to live with him. She's naturally ecstatic.
  • Oh, Crap!: Karasuma's reaction upon seeing the other photo that Takaoka left behind at the teachers' room and realizing that his students are now at the mercy of a complete and utter psychopath.
  • Only Sane Man: In comparison to other teachers, most of his students, and his own (shady) bosses? Oh, yes.
  • Reasonable Authority Figure: Karasuma cares just as much for making sure the kids can overcome the school's system as he does keeping them healthy and safe while making sure they can stop Koro-sensei from destroying the world. He also intervenes on their behalf whenever he feels the government is overstepping into their lives. When soldiers come in to take Class 3-E into custody after successfully assassinating Koro-sensei, he tells them that they cannot lay their hands on the kids as long as they are in the classroom (and thus under his protectorate), allowing them some private time to mourn their loss.
  • Papa Wolf: When Takaoka attacks the students, he's quite ready to destroy him in a fight, and when the former attempts to attack Nagisa he follows through with a one-hit knock out.
  • Shounen Hair: It actually makes him looking badass at first sight.
  • Slasher Smile: Does this a couple of times in battles.
  • Stern Teacher: Very much. But, the pupils actually like him for it, even if they acknowledge it at the same time.
  • Sugar-and-Ice Personality: Always serious and businesslike, but ultimately a good and caring person at heart. However stern and stoic he is, deep down he does care a lot for others and will not hesitate to put his life on the line for their sake and it's very obvious to all concerned.
  • Team Dad: At 28 years old, Karasuma is the oldest member of Class 3-E (barring Koro-sensei), and he also serves as a stern but compassionate father-figure to the students.
  • They Do: He is married to Irina in the epilogue.
  • Trying Not to Cry: After Koro-sensei finally dies, Karasuma is struggling to fight off his tears, while Irina quietly weeps by his side, as they helplessly watch the students grieve over their beloved sensei.
  • Tsundere: He likes his coworkers well enough, but doesn't want to openly show it and keeps treating them harshly. In Koro-sensei's case, Karasuma doesn't forget he's his assassination target and can't be friendly with him. With Irina, Karasuma just finds her advances annoying and keeps his distance from her. Even when he's married to Irina seven years later, he keeps treating her coldly.
  • Wacky Marriage Proposal: Instead of offering a proper marriage proposal, Karasuma tells Irina that she should retire from her profession as an assassin and stay with him. He allows her to fill in the blanks of what he really meant.
  • Was Too Hard on Her: Eventually realizes that his treatment of Irina is too harsh, which led to her brief betrayal, and promptly apologizes for it.

    Irina Jelavić / "Bitch-sensei" 

Voiced by: Masumi Asano (Japanese, vomic), Yui Horie (Japanese, event anime), Shizuka Ito (Japanese, TV anime), Martha Harms (English)

Portrayed by: Kang Ji-young

"C'mon, I'm an assassin — I'm supposed to be killing people, not hunting an octopus with brats."

A Yugoslav assassin who was sent to Class 3-E to kill Koro-sensei. After a failed first attempt she settles down as their English (Social Studies in the English dub) and infiltration teacher.

  • Accent Slip Up: She can speak languages in their native accents, but when her true accent shows up when she is really chagrined.
  • Action Fashionista: She is very fashion-conscious, teaches English with Sex and the City and takes every opportunity to dress up in revealing clothes... but she is also a scarily efficient assassin. That's most of the boxes ticked, then. The Roll Book Time even shows that each student entry has her fashion-check notes on both their school and casual clothing.
  • Badass Teacher: See Beware the Silly Ones
  • Beware the Silly Ones: Her short temper and role as the class's main Comic Relief and Butt-Monkey can make you forget she's a notorious and skilled hitman.
  • Bitch in Sheep's Clothing: When she first transferred into Class 3-E, she comes off as an airhead. Outside of Koro-sensei's presence, however, she shows a more vicious, unsympathetic side, inspiring Karma to call her "Bitch-neesan", which later mutated into "Bitch-sensei".
  • Bunny-Ears Lawyer: Irina is a fashion-obsessed airhead. Who can teach multiple languages and interpersonal interaction surprisingly well as a result of her training as an assassin.
  • Butt-Monkey: Part of her comedy value. She quickly learned there are a select few people her usually reliable skills aren't that useful against. Doesn't stop her trying (and failing), though. Henna tattoos of total embarrassment may be involved on occasion.
  • Can't Act Perverted Toward a Love Interest: She admits to sleeping around in her job and has no shame in giving her own students French kisses. With her crush Karasuma, she doesn't dare to do more than a napkin Indirect Kiss.
  • Character Development: Despite having been Easily Forgiven by Koro-sensei, Karasuma and the rest of Class 3-E for betraying them to the "Reaper", Irina, touched by their goodwill, decided to live up to their faith by becoming a better person. She has stopped being a tease (even starting to wear more conservative clothing), started taking her teaching job seriously, and became a friendlier woman.
  • Chekhov's Skill: During a late Season 1 episode, a Stinger shows that Irina has the ability to make a model soldier out of its pieces with her tongue in her mouth. She uses this skill to slip the students the explosives, maps and other tools they need to escape their imprisonment.
  • Child Soldiers: She made her first kill when she was twelve, which is even younger than her current students are.
  • Christmas Cake: It never comes up as a character point, but a throwaway joke shows Itona on a scavanger hunt looking for "something near its expiration date" and dragging Irina along (even though she's only twenty).
  • Cool Big Sis: On a good day, she's this for the class.
  • Combat Stilettos: Those high-heeled sandals she wears almost all the time don't hinder her work as an assassin.
  • Crippling Overspecialization: She was taught seduction and infiltration techniques that are second to none, but at the expense of being subpar in combat techniques. As a result, she's at a major disadvantage when she's found out, which is why Lovro initially came in to dismiss her.
  • Cultured Badass: Her language and communication skills, as well as being able to play piano beautifully, makes her this.
  • Cunning Linguist: As a globetrotting saboteur, she speaks many languages, and is able to get close to almost anyone through her wits and charm. During the Hotel arc, she easily distracts an entire room full of guards to allow the students to proceed.
  • Dark and Troubled Past: First implied when she tells the students that they were lucky to be born in a peaceful country. It's later revealed that her homeland had an ethnic war and that, when she was twelve, she killed a soldier who killed her parents with her father's gun, then hid the corpse with her in the cellar to wait for the enemy to leave, all while feeling the body going lukewarm next to her. Considering her age and ethnicity, it should be pretty obvious exactly what conflict is being referenced here.
  • Distracted by the Sexy: One of her specialties.
  • The Ditz: If she wasn't an assassin, you'd wonder about her ability to survive.
  • Easily Forgiven: Turns on the students, beats them, captures them and briefly joins the "Reaper". She's reinstated after Kurahashi convinces Karasuma to give her a second chance. To be fair, though, after that she really puts effort into redeeming herself and living up to their good faith.
  • Embarrassing Nickname:
    • "Bitch-neesan", first floated by Karma, and later "Bitch-sensei", as an affectionate term. Even the more polite students use it freely.
    • In the official English, subtitles use "Professor Bitch" while the manga avoids the swear word but preserves the pun by calling her Ms. Vitch.
  • Even Evil Has Standards: The other students' treatment of Class 3-E at the assembly appalls even a sly assassin like her.
  • Everyone Can See It: The whole class knows that she is in love with Karasuma. She doesn't deny it.
  • Femme Fatale: She's done her utmost to cultivate this... and, is more than willing to pass the techniques along.
  • Forceful Kiss: Plants a a 30-hit combo to Nagisa in order to get him to share Koro-sensei's weaknesses. She also does this to the other boys, either as punishments or as rewards.
  • Getting Crap Past the Radar: Her introduction is one. What Koro-sensei does to her is another.
  • Good Costume Switch: After being reinstated into Class 3-E despite her brief Face–Heel Turn, she starts wearing more conservative clothing to signify her turning a new leaf, although the fact that her crush Karasuma is also a conservative man may also have something to do with her decision. Ironically, the guys find her even more attractive after this.
  • Good Smoking, Evil Smoking: She smokes during the first few chapters she appears in, but stop completely after her Heel–Face Turn.
  • Hair-Trigger Temper: When she's frustrated, she doesn't exactly hide it (unless from an actual target). Added to a set of Berserk Buttons of questioning either her sex appeal, her competency or her dedication to killing Koro-sensei... and of course, calling her "Bitch-sensei" (Though that last one becomes less prominent as the series goes on).
  • Heel–Face Revolving Door: After Karasuma showed her how hard Koro-sensei works for his students, she decides to take her job as a teacher seriously. Then she was manipulated by the "Reaper" into betraying Class 3-E to get greater chance to kill Koro-sensei, even if it brings harm to the kids. Then she is reinstated back to the class after the "Reaper" dumps her and the students learn of her psychological trauma, to which she decides to live up to the goodwill given to her.
  • Hidden Depths:
    • She’s well aware that her beauty may not last for long and one should do everything she can to make herself shine as a woman.
    • Her behavior sometimes comes off as childish and immature compared to the rest of the cast. The few students who get to know her well eventually realize that she never fully matured due to having grown in a wartorn environment.
    • She is shown to be good at reading people, best demonstrated by her seeing through Takaoka's excessively cheerful personality right from the start. Arguably her own acting skills allow her to recognize when someone else is acting.
    • As proven by the Assassination Island arc, she is an excellent pianist.
  • Hollywood Homely: Subverted, when Irina started dressing more "plainly" to better fit in a regular life, the male students ended up finding her even more attractive now that she has toned down the Ms. Fanservice act.
  • Honey Pot: What she did before coming to this school.
  • Hot Teacher: Duh! Everyone acknowledges it.
  • Indirect Kiss: To Karasuma with his napkin. Unfortunately, he doesn't get the reason behind it.
  • Instant Expert: She picks up Japanese in just a few months, because she is already used to learning languages.
  • It Only Works Once: Irina's biggest flaw as an assassin is that once her Honey Pot cover gets blown, she gets flustered and can't complete her job.
  • Keep It Foreign: Averted. Rather than choosing another language for her to teach, the English Dub made her the Social Studies teacher.
  • Ladykiller in Love: A female version. She has seduced countless men to reach her targets in the past. Karasuma is the first man she has a genuine interest in. Unfortunately, he's immune to her advances and just doesn't like her that way at least at first.
  • Marshmallow Hell: Irina tries to extract information on Koro-sensei's weaknesses by smothering Nagisa with her breasts. A couple of schoolmates find themselves incredibly jealous of him.
  • Ms. Fanservice:
    • The students discover that she has the ability to make anything she wears incredibly sexy, even a conservative sweater.
    • She often tries to invokes this tropes, but comically fails for most of the time.
  • Mundane Utility: She uses her skillset as an infiltration-centric Honey Pot to teach the class, whether it be her skills as an Omniglot to teach English in the Japanese version, or her skills as The Charmer to teach grammar and speechcraft in the English version.
  • Omniglot: She speaks ten languages, which she learned by taking lovers in each country she visits and learn from them.
  • Please Kill Me If It Satisfies You: This is asked of her by Koro-sensei as he allows himself to be assassinated. She respectfully declines, claiming only his students have the right to sever their ties.
  • Plucky Comic Relief: She's usually delegated to this role when she's not at the focus of an arc.
  • Proper Tights with a Skirt: After her Good Costume Switch.
  • Self-Imposed Challenge: She overcomes challenges. Her win against her teacher Lovro (the challenge was an mock assassination on Karasuma) by using a wire trap (which he never taught her) while using seduction (which she knew it wouldn't work against Karasuma) as a camouflage.
  • Sensei-chan: She's a little more volatile than most, but fits the bill.
  • Sensual Slav: A South Slavic examplenote .
  • Single Woman Seeks Good Man: She gets a crush on and ultimately marries The Stoic, yet ultimately kind-hearted Nice Guy that is Karasuma.
  • Smoking Is Glamorous: Initially has this, but she drops it rather quickly when Nagisa informs her about Koro-sensei's heightened sense of smell
  • Spell My Name with an "S": The English manga spells her name "Jelavitch" to make clear the pronunciation and the "vitch"/"bitch" pun.
  • Stripperiffic: Flashes just a bit too much flesh than she really should as a teacher, whenever possible.
  • Sweater Girl: After her Good Costume Switch.
  • Team Mom: Subverted, after Class 3-E reveals that they considered Karasuma to be the class' Dad, Irina then asks if this means they view her as the mom. They don't.
    Takebayashi: You're more like the class bitch.
    Irina: Asshole!
  • They Do: She is married to Karasuma in the epilogue.
  • Took a Level in Kindness: She initially doesn't care about or believe in the students, but as time passes she grows fond of them and increasingly become disgusted by the school's system of degrading Class 3-E.
  • Tsundere: She grows fond of the class soon enough, but still gets annoyed by the Butt-Monkey treatment they give her. She also has a hard time finding the right way to express her crush on Karasuma, who keeps brushing off her advances. Nagisa thinks this has something to do with how Irina's line of work kept her from learning how to be honest with her feelings.
  • Villain Ball: Though her initial plan to kill Koro-sensei was well-planned, Irina ignored the critical detail of Koro-sensei's weakness to weapons of a specific material, instead choosing to use live ammo under the assumption that no living creature could survive a barrage of lead. Suffice to say, the attempt fails badly.
  • Weak, but Skilled: Despite being pretty subpar in outright combat, her skill in manipulation, distraction, and seduction is unmatched.
  • Womanchild: Downplayed, but it is pointed out that her past means she did not fully mature emotionally, which is why she can be ditzy at times.
  • Wounded Gazelle Gambit: When she betrays Class 3-E to the God of Death, she proves that familiarity with her can be just as dangerous.
  • Younger than She Looks: Her students couldn't believe it when Irina reveals that she's only twenty years old. They say her sexy body and experience in the world of seduction gave the impression that she was much older.

Main Characters

    Nagisa Shiota 

Voiced by: Nozomi Yamamoto (Japanese, vomic), Nao Touyama (Japanese, event anime), Mai Fuchigami (Japanese, TV anime), Lindsay Seidel (English)

Portrayed by: Ryosuke Yamada

"Like you've got the balls to try [killing someone]. Go right ahead."

The most often seen student, and the main perspective character. He fell into Class 3-E at the end of the previous year due to poor grades. Mild-mannered, cautious and relatively weak (not to mention rather effeminate), he prefers to observe and collect data on Koro-sensei's weaknesses rather than participate in assassination attempts. Despite that, or perhaps because of it, he is considered to be one of the best assassins-in-training in the class.

5th best marksmanship, boys' side.

  • Abusive Parents: His mother Hiromi, is one of the My Beloved Smother variants. She forces him to conform to her version of his life and future (i.e., what she couldn’t achieve when she was younger) without considering what he actually wants, frequently tells him she wishes he were born a girl, ( going as far to invoke Dude Looks Like a Lady by refusing to let him cut his hair) and gets incredibly violent when he shows even the slightest hint of disobedience. The saddest part is that he could’ve chosen to live with his father, where he’d clearly be happier, but instead chose to live with his mother out of concern for her mental health, which likely ties back to his lack of self preservation.
  • The Ace: Even before he trounced Takaoka, he was the only normal human to threaten Koro-sensei to the point where he had to use his molting ability. He is also readily acknowledged as being the go-to guy for information and analysis. Most of the embarrassing information shown in the assassination video for Koro-sensei was his contribution.
  • Ain't Too Proud to Beg: When Takaoka forces him to ask for forgiveness on his knees to get the antidote for his friends, he immediately complies. However, he does not bow his head until specifically ordered to, and even when the former puts his boot on his head, he doesn't let his face touch the ground.
  • Ambiguous Disorder: There is something off about him.
    • He isn't intimidated by having to wield a real knife, let alone threaten someone's life, even though it's specifically pointed out that he should be. Yet he isn't generally callous or manipulative like a sociopath — he is just cold and calculating, as though he were a veteran hitman. Not only does he show little hesitation, but he is clear-minded enough to attack using the dull side of the blade.
    • His early interactions with Karma are also not quite ordinary. Most would be rather disturbed by the latter's claims of wanting to kill his teachers, but Nagisa, who's already used to his exaggerations, remained calm the whole time, barely showing any reaction.
  • Animal Motifs: A snake, symbolizing his viciousness and his ability to hide in plain sight, like a snake in the grass.
  • Anime Hair: He seems to have odd pigtails in the back of his head, but since he was never seen with his hair down — even when swimming — for a long time it was believed that that was its natural shape. Chapter 112 reveals that they actually are pigtails.
  • Attractive Bent-Gender: He only needs to put on a skirt and some hair decorations to pass off as a really convincing girl, and even caught a guy's attention like this. According to Hayami, he looks so feminine, it's unnatural. Justified, since Hiromi, who wanted a daughter, makes him look like a girl.
  • Audience Surrogate: For younger audiences in Japan, a character who struggles in school and suffers from lack of confidence would be extremely familiar to a lot of people. By this interpretation, that would make his ability to summon up will when needed and his various talents Wish Fulfillment.
  • Awesomeness by Analysis: His abilities are hardly superhuman, but he still possesses the best sensibility and instinct in the class when it comes to planning an assassination (even Karasuma's analysis in Roll Book Time rate his reconnaissance stat a full 6/6, whereas the rest score 3/6). Then he reveals that he has the ability to analyze someone's motives by looking at his/her body language alone. It becomes amplified after he's temporarily paralyzed by the "Reaper", and he describes it as being able to see a mental image of each person's individual "wavelength of consciousness".
  • Badass Adorable: Nagisa is the shortest, most androgynous and meekest of the boys. And he is also one of Class 3-E's most natural assassins, cemented by destroying Takaoka in a duel with real knives — twice — and ambushing Nakamura, Terasaka, Muramatsu and Yoshida during the civil war game before choking Karma to submission for a total of five kills, the most in the class.
  • Badass Teacher: His occupation after the Time Skip. Especially when Nagisa was put in charge of one of the worst classes full of delinquents and misfits. He'll still see that they graduate.
  • Bad Powers, Good People: At one point, Nagisa becomes frustrated over the fact that his only redeeming talents are his terrifying assassination skills. After using those same talents to save his mother from being killed by an assassin, he resolves to find a way to use those talents to help people, one way or another. In the epilogue, he finds his creative expression through teaching and rehabilitating delinquents.
  • Bare Your Midriff: The outfit he wore while pretending to be a fish.
  • Beat Them at Their Own Game: At the climax of the civil war game he defeats Karma with the kind of brute force he specializes in (i.e., a triangle armlock).
  • Beauty Is Never Tarnished: He still looked pretty good despite being a bit roughed up during his final fight with Takaoka in the Assassination Island arc.
  • Beware the Nice Ones: On one hand, he's a genuinely sweet kid who gets along with just about everyone in the Ragtag Bunch of Misfits that is class 3-E. But on the other hand, his stealth and sheer bloodlust can make elite veteran soldiers shit bricks. And as it turns out, his habit of noting down people's weaknesses also serves well with character assassination, his other specialty.
  • Big Brother Mentor: To little Sakura. Like Koro-sensei, he uses his knowledge of basic assassination techniques to help her pass a math test and avoid being intimidated by her classmates.
  • The Big Damn Kiss: As Kaede is rampaging, he manages to distract her by kissing her long enough to induce a Post-Kiss Catatonia which allows Koro-sensei to remove the tentacles.
  • Bishōnen: To an effeminate extreme.
  • Book Dumb: Relatively speaking. He did fall into class 3-E due to poor grades, after all. But when it comes to applying the knowledge he has, he's more like a Teen Genius.
  • Bread, Eggs, Milk, Squick:
    • The three things he wants most are to get to know everyone in his class, to live without leaving things unfinished, and to kill his teacher.
    • That's not the only time Nagisa's train of thought blithely dips into surreal and slightly disturbing territory. Read the journal entry Koro-sensei grades in Chapter 2. It looks like a normal journal entry, discussing Nagisa's favorite food and where his family went for dinner the night before (a sushi restaurant). He notes that his favorite food is takosushi, and that Koro-sensei looks like an octopus. His entry abruptly ends with him wondering what Koro-sensei tastes like.
  • Chekhov's Gun: Those hairbands Nagisa always wears around his wrists. He's almost never seen without them, and when he isn't it's usually a drawing error. He has them just in case something happens to the ones he wears in his hair, because he's embarrassed by how long it is, but his mother doesn't allow him to cut it.
  • Chekhov's Skill:
    • The "sure-kill technique" he learned from Lovro is left unmentioned and unexplained for several chapters until he uses it on Takaoka in their second duel.
    • He also managed to pick up a bit of Irina's kiss technique. He uses it as a Cooldown Kiss to interrupt Kayano's tentacle-induced rage. However, he's only skilled enough to do a 15-hit combo.
  • Child Prodigy: In assassination.
  • Classical Anti-Hero: Though he's more than willing to assassinate Koro-sensei, Nagisa is the shortest guy in the class, physically weak compared to the rest of the students, and has a few confidence issues thanks to being dropped into Class 3-E (as well as some major domestic issues). Didn't stop him from standing out as one of Class 3-E's best assassins.
  • Clueless Chick Magnet: Kayano clearly has a crush on him, as well as, implicitly, Nakamura and (according to the Roll Book Time) Kanzaki. For his part, Nagisa's low self-esteem makes him none the wiser.
  • Curtains Match the Window: Blue hair and eyes.
  • Cutlass Between the Teeth: Nagisa holds a combat knife with his mouth so he can limber up before he fights Takaoka. It's become one of his trademark poses in both official and fan art, such as in his character image above.
  • Deadpan Snarker: He has his moments, though it’s more in the English Dub. One example is as Okajima is showing them a picture of the new transfer student:
    Sugino: Woah! It’s a girl?
    Nagisa: (dryly) And you’ve already made her your screensaver.
  • Death Glare: Nagisa sends one to Takaoka when the conditions for his assassination method are finally met. He is smiling, but that only makes it even more chilling.
  • Decoy Protagonist: Subverted with regards to Kayano. The latter spent a whole year nursing an ultimately misguided grudge against Koro-sensei for her sister Aguri's death, and used Nagisa to hide her true intentions. Ultimately, however, it was Nagisa who played a key role in the last quarter of the series by saving Kayano from her tentacle-induced madness, helping the class change their objective to saving Koro-sensei from his impending explosion (reclassifying their original objective of assassination as a last resort), having to deal the fatal blow on Koro-sensei before a government anti-sensei laser fires on him, and finally following his footsteps as a teacher.
  • Dissonant Serenity: Walking up to Koro-sensei with a grenade around his neck and knowing full well he could get seriously injured or even die with nary a change in his usual expression? Check. Taking down an elite veteran soldier by casually walking up to him as though he were walking to school and slashing at his neck? Check. His ability to completely hide his (considerable) killing intent is his greatest strength, making him the most assassin-like of all the students.
  • Does Not Know His Own Strength: Karasuma's assessment in the Roll Book Time notes that he has little idea as to how terrifying his assassination skills are until his first duel with Takaoka, and even after that he still sees no limits as to its true potential.
  • Dragged into Drag: Because he looks so girly, Nagisa has suffered this a few times courtesy of Nakamura. He's been forced to crossdress during the girls' infiltration mission in the Assassination Island arc, got his pants swapped with Nakamura's skirt during the School Festival, and at the Koro-sensei Q! Spin-Off, accidentally charmed the whole class with Kayano's cute two-piece swimsuit.
  • Dude Looks Like a Lady: He has Girlish Pigtails and a slim, feminine-looking body (minus boobs). This is lampshaded during Chapter 43's pool time, where Nakamura saw him wearing trunks and admits that until then she was confused about his true gender. He also only needs female clothing and some accessories to pass up for a girl in Chapter 66 / Season 1 Episode 19 and accidentally charm another boy. This is deconstructed, however, when it was revealed that his mother deliberately set this up because she always wanted a daughter.
  • Effeminate Voice: Nagisa is an androgynous-looking boy who has managed to easily pass off as a girl when forced to wear a skirt. Fittingly for his appearance, Nagisa is voiced by a woman.
  • Even the Guys Want Him: When a disguise makes them think he's a girl, that is. And possibly even when they know he's a boy.
  • Expressive Hair: Subtly. His pigtails droop when he's feeling particularly down. They lift up and become wing-like when he's surprised or his killing intent is switched on.
  • Extreme Doormat: He allowed himself to be abused by his Control Freak of a mother without saying a word, because everytime he tries to defy her, she flies into a rage. Fortunately, this has come to an end when he saves her from an assassin.
  • First-Name Basis: Everyone calls him by his given name. Really everyone. This is a bit odd in a Last-Name Basis setting. Chapter 178 reveals that this setup would make it easier for him to re-adopt his old surname if his parents ever get try to patch things up, which they do as requested by Koro-sensei.
    • This gets upped by his students during his student teacher tenure who also call him by his first name with no honorifics.
  • First-Person Peripheral Narrator: While Koro-sensei is the central character, Nagisa provides most of the narration, usually in the form of explaining the thoughts of the whole class.
  • Follow in My Footsteps: After saving his mother from an assassin using the same skills he honed throughout his childhood with her, Nagisa decides to follow Koro-sensei's path as a schoolteacher.
  • Gender-Blender Name: "Nagisa" is an androgynous name, though more often given to girls. Makes sense since his mother wanted a daughter.
  • Girlish Pigtails: Seriously, look at his hair. You can't deny that those are pigtails, and he looks very girly with them. He did this out of a need to put his shoulder-length hair in control because his mother wouldn't allow him to cut it. Also, he originally mulled a ponytail, but Kayano suggested his current style so he could stand out enough for her to be able to blend in with the "background characters".
  • Groin Attack: He gets a verbal one. After he changes back from the girl outfit to his normal clothes, Karma suggests he should get rid of "it". Needless to say, Nagisa is not amused and wants to keep "it".
  • Guile Hero: He's a tricksy one, no doubt about it. The standout example would be Hidden in Plain Sight during the civil war game by matching his camouflage to Karasuma's so he could stand back-to-back with him, allowing him to keep an eye on the entire battlefield and take out Nakamura and the delinquent trio at once.
  • Height Angst: He is a little dismayed at the fact that he hasn't grown much even after seven years.
  • Heroic Self-Deprecation: He's at least competent at everything he does, but you wouldn't think so by how low his opinion of himself is unless his killing intent is switched on.
  • Heterosexual Life-Partners: With Sugino and especially Karma.
  • Hidden Depths: Nagisa is heavily implied to be more than just the main perspective character, as evidenced in a training session in Chapter 38 / Season 1 Episode 13, where Karasuma challenges the kids to attempt to attack him with their anti-sensei knives (which are harmless to humans). A monstrous snake suddenly attacks Karasuma, later revealed to be a symbolic representation of Nagisa's sneakiness. Later, when Takaoka challenges the class to fight him with real knives (believing that, like his other recruits, they'll choke because they've never used a real weapon), Karasuma gives the knife to Nagisa, who immediately dispatches him. Even Karma notes from time to time that there's something deeply disturbing about him, which was implied to be the reason they drifted apart for some time before landing on Class 3-E.
  • I'll Kill You!: Nagisa asserts this to Takaoka after he destroys the antidote needed to save his classmates. His classmates are perfectly willing to believe he'd actually go through with it.
  • Important Haircut: Nagisa tells his mother that once he feels like he has earned his desired results in Class E, he will cut his hair after graduation. In the epilogue, we see that he has lived up to his word.
  • Inelegant Blubbering: After dealing the deathblow to Koro-sensei, he's the first of the students to break into heavy sobbing. It's not pretty.
  • Insecure Love Interest: Nagisa has such a low self-esteem that he thinks there's no way a girl falls for him. He actually thinks Kayano might hate him for kissing her.
  • Kill the Ones You Love: At the end of the series, the whole class were forced to kill Koro-sensei, but special mention goes to Nagisa, who volunteers to deal the fatal blow.
  • Killing Intent: He can make middle school bullies and two of the government's most elite soldiers lose their composure and tremble in fear through killing intent alone, symbolized by a gigantic snake. This is played with come Chapter 128, where it is revealed that some of his covert bloodlust actually belongs to Kayano, who used him to conceal herself until the time is ripe for killing Koro-sensei.
  • Legacy Character: In the epilogue, Nagisa, now a schoolteacher himself, takes on the legacy left by Koro-sensei in rehabilitating social outcasts, symbolized by his serpentine aura being replaced with an image of his beloved sensei.
  • Let's Get Dangerous!: He's known to everyone as a kind, meek student without any noteworthy physical abilities, though a few characters catch glimpses of his potential as an assassin.
    • When Karasuma chooses him to fight Takaoka in a duel, most characters couldn't comprehend why... until Nagisa flawlessly takes Takaoka down using his wits and killing intent, even though the match was rigged against him.
    • When he's normal, he's so normal Karma thought he was so un-scary that it was scary, because Karma had just seen how dangerous he could be but couldn't detect anything about him that gave that away. And when he's not normal, even when facing a vastly stronger opponent his classmates seem to be more afraid of him than for him.
  • Living Emotional Crutch: Kayano admits that the only reason she never completely lost her mind due to the loss of her family and her misguided vendetta is because Nagisa filled her heart with warmth.
  • The Load: Lampshaded by himself, as he points out that accompanying his female classmates while being dressed up as a girl was completely pointless in the end. Though, Karma thinks it would be obviously funny.
  • Long-Haired Pretty Boy: He has shoulder-length hair, which only contributes to his girly looks. Turns out his mother doesn't allow him to cut his hair because she wants him to look like a girl.
  • Love Martyr: The Graduation Book Time reveals that when his parents separated, he chose to live with Hiromi out of concern for her wellbeing, even if he has to bear the brunt of her hysteric fits. He's willing to put up with her constant abuse and My Beloved Smother tendencies just because he loves her and doesn't want her to be alone.
  • Marshmallow Hell: Irina tries to extract information on Koro-sensei's weaknesses by smothering him with her breasts. A couple of outsider students find themselves incredibly jealous of him.
  • Maybe Ever After: His and Kayano's status is up in the air as of the epilogue.
  • The Narrator: Most of the anime and manga is narrated by Nagisa.
  • Nerves of Steel: Nagisa tends to keep his cool whenever he's in a situation where his life is at risk. Koro-sensei notes that this is one of the important aspects of an assassin.
  • Nice Guy: Nagisa is meek, very sweet towards his classmates, and won't easily let his emotions get the best of him. Even after showing off some terrifying displays of bloodlust, his classmates still respect him for his kindness.
  • Nice Hat: Sports one as an adult, shown here.
  • Nightmare Face: An unusual example, but his innocent smiling faces have given Takaoka some serious nightmares.
  • No-Holds-Barred Beatdown: He briefly suffers one from Takaoka in their final showdown in Episode 22. It doesn't put Nagisa down, however, and ends up terrifying him with his sheer assassination skills while never failing to put on a sweet smile like it was nothing.
  • Not So Above It All: While he's usually Class 3-E's Only Sane Man, he won't hesitate to get a little mischievous when a plan calls for messing with Koro-sensei or one of the uppity students from the main campus.
  • Oblivious to His Own Description: It has been remarked that he is the only person who doesn't realize just how dangerous his Killing Intent is.
  • Oblivious to Love: Even after the 15-hit kiss combo incident, Nagisa is pretty unaware of Kayano's crush on him. Karma warns her that Nagisa will never figure out how she feels unless she tells him directly.
  • Odd Friendship: With his long-time friend Karma (in contrast to his good chemistry with Sugino). Where Nagisa is meek but subtle, Karma is outgoing and reckless.
  • Older Than He Looks: Seven years later, and he's only grown a paltry three centimeters (barely an inch). As a result, he looks way too young for a 22-year-old.
  • Ordinary Middle School Student: Thoroughly normal, though in keeping with this trope there are a couple hidden special things about him.
  • Out of Focus: During Season 2 Episode 8, which heavily focuses on Karasuma. This is probably the only episode where he doesn't even get a single line.
  • Pint-Sized Powerhouse: He is the shortest boy in the class at 159cm (5'2"), and he can take down people taller and bulkier than him with ease.
  • Post-Kiss Catatonia: He passes out after receiving a 30-hit kiss from Irina.
  • Pre-Mortem One-Liner: Before tasing Takaoka unconscious in their final fight, he simply "thanks" him.
  • Psychotic Smirk: Has an utterly chilling one when he gets serious.
  • Rage Breaking Point: After keeping his composure together while trying to appease Takaoka in order to obtain the antidote to the lethal virus afflicting his classmates, he finally loses it when Takaoka destroys the antidote anyways.
  • Raised as the Opposite Gender: The reason for his feminine tendencies. His mother is a psychotic Control Freak who doesn't let him cut his hair, and often wishes aloud that he was born a girl.
  • Red Herring: Perhaps the ultimate example, in that some of his bloodlust actually belongs to Kayano/Akari.
  • Red Oni, Blue Oni: The Blue to Karma's Red, as shown by their hair colors. Nagisa is calm, withdrawn and not very confident of himself, while Karma is violent, vicious and arrogant.
  • Sensitive Guy and Manly Man: The Sensitive Guy to Karma's Manly Man.
  • Shrinking Violet: While not nearly as timid as Okuda, he's fairly quiet and withdrawn, so only speaks when he feels he has something to contribute. This greatly assists his assassin skills, because no one can see him coming. He probably developed these tendencies so he wouldn't provoke his mother's violent temper.
  • Shy Blue-Haired Girl: A male example. He is a reserved, polite, and quiet boy, in stark contrast to Fiery Redhead Karma.
  • Significant Birth Date: The Roll Book Time reveals that he was born on July 20, the same as Eishi Sasazuka from Majin Tantei Nougami Neuro, series author Yuusei Matsui's previous work and himself another natural assassin. Also the birthdate of Alexander the Great, a strategic genius.
  • Silk Hiding Steel: Male version. He is certainly not your traditional badass, but he can make himself appear so innocent that a man intent on beating him into submission was stunned into inaction long enough for him to get in position for what could easily have been a killing blow. Even in their rematch, when his opponent was expecting it.
  • Strong Family Resemblance: Although he probably has his dad's hair and eyes, everything else on his face makes him resemble his mother.
  • Supporting Protagonist: From Chapter 1 onward, he's been making note of every strength and weakness of Koro-sensei. Subverted come Chapter 177, where he volunteered to deal the fatal blow to Koro-sensei.
  • Surprisingly Good English: English is his strongest subject, and across the class he is second only to Nakamura. We get to see one of Nagisa's graded English assignments in Chapter 2. It's not perfect, but it's legible. For added attention to detail, there are even a couple of spelling errors that are pointed out.
    Note: "There aren't many grammatical errors and it wraps up nicely. What an excellent journal entry!!"
  • Tears of Joy: His reaction after seeing his parents reconcile under Koro-sensei's guidance.
  • Tears of Remorse: After finally landing the fatal stab to Koro-sensei at the end of Chapter 177 / Season 2 Episode 24, he immediately breaks down crying over being forced to kill the one person who helped him discover his passion and transcend his inner demons.
  • Tranquil Fury: When Takaoka blows up the antidote needed to save his friends, he develops Dull Eyes of Unhappiness and not-so-calmly announces his intention to kill him. After Koro-sensei and Terasaka talk him out of diving into a full blown Unstoppable Rage, his anger cools into a peaceful, terrifying smile as he prepares to use the "secret killing technique" on Takaoka.
  • Troubling Unchildlike Behavior: It's present for the entire class, but he's a very notable case. He's just too much of a natural at assassinations, which becomes even more troubling when juxtaposed with his usual behavior.
  • Uncanny Valley Girl: Rare Male Example. He looks girly and is a sweet kid to boot. Nevertheless, beware if he smiles gently at you, especially after you've done something horrible.
  • Waistcoat of Style: He's the only one student who wears the waistcoat without the blazer over it.
  • Was It All a Lie?: He asks this to Kayano/Akari when she reveals her true identity and motives. She coldly states that it was and everything was just an act to carry out her revenge. However, Nagisa refuses to believe this, and it pays off after Kayano, freed of her tentacles' control, admits that her school life had a profound effect on her.
  • Weak, but Skilled: Takaoka notes that Nagisa is the weakest of the boys, with physical stats closer to that of a girl's. A few pages later, Karasuma is staring at Nagisa in awe as he managed to take down Takaoka in a matter of seconds and noting that Nagisa's talent never would have been discovered in the course of a normal school life. Ends up on the less-favorable end of this trope when fighting Karma during the civil war game. While he got Karma into a powerful choke hold almost instantly, Karma was able to negate it and stand up, with Nagisa still locked around his neck, from sheer strength. While Isogai and Maehara struggle to rein in Karma, Nagisa was easily restrained by Sugino.
  • "Well Done, Son!" Guy: It's not brought up often, but his parents haven't looked him in the eye ever since he landed in Class 3-E, and he would very much like to make, if not them, at least someone proud of him. And he's literally willing to kill to reach that goal.
  • We Used to Be Friends: Chapter 144 reveals that Nagisa and Karma used to be closer during seventh-grade, but slowly grew apart until they were just classmates. Nagisa thought Karma grew bored of his mediocrity. In truth, Karma feared his covert bloodlust. Once they were both in Class 3-E, they started interacting with each other again, but their relationship is now clouded with some lingering doubts and fears.
  • When You Coming Home, Dad?: Nagisa outright says that his father left home because he didn't want to deal with his mother's psychosis. Therefore, they don't get to see each other often, which is unfortunate because theirs seems to be one of the very few positive parent-child relationships in the series. Nagisa seems to like him much more than his mother, who he lives with. This turns out to be true as in chapter 113, which reveals that his mother is quite abusive.
  • You Gotta Have Blue Hair: His hair is light blue.

    Karma Akabane 

Voiced by: Nobunaga Shimazaki (Japanese, vomic), Nobuhiko Okamoto (Japanese, event and TV anime), Austin Tindle (English)

Portrayed by: Masaki Suda

"I think not enjoying yourself in a classroom where it's okay to kill is such a waste."

Nagisa's long-time classmate who joined late due to being suspended from school for trashing his teacher's office. He started off holding a major grudge against all teachers, and as such is one of the students most dedicated to the assassination. Koro-sensei helped him get over that particular issue, but he is still a near-sociopath who loves to beat people who aren't his classmates into unconsciousness.

3rd best marksmanship, boys' side.

  • Academic Athlete: Karma is one of the best students in academics and sports (in fact, he would be one of the Five Virtuosos if he hadn't stood up for the bullied class 3-E student). Too bad he's a lazy delinquent.
  • Arc Villain: While not exactly a straight up villain, he was definitely an antagonist to Koro-sensei in Chapters 4-6 (Season 1 Episode 3).
  • Awesome Mc Coolname: In contrast to Kimura, who's embarrassed by his first name "Justice", Karma genuinely likes his name, which is a result of his parents loving Indian culture.
  • Ax-Crazy: In the beginning of the series, he has shown a crazy obsession for killing Koro-sensei. It toned down after he learns to respect his teacher.
  • Berserk Button: He snaps on Nagisa when, not only does he refuse to kill Koro-sensei, but also because Nagisa denied being good at assassination and that Karma is better, likening it to a beautiful, popular girl telling uglier girls that they shouldn't care so much about getting boys's attention.
  • Bishōnen: Several of the girls state that he's pretty good looking and would've been a ladykiller but for his psychopathic tendencies.
  • Biting the Handkerchief: Played for Drama without tears, but biting his test papers is a clear sign of how upset he is by failing to beat Asano Jr. in the math portion of the first term finals, and on top of that performing worse than in the midterms when Class 3-E had a handicap.
  • Breakout Character: Karma is the most popular student alongside Nagisa, and he's one of the most prominent and important students of the series.
  • Brilliant, but Lazy: Aside from assassination attempts, he never seems to put much effort into anything, even training. Not that it affects his overall performance much. Comes to bite him in the ass during the first term finals where he performs badly enough to go from 4th to 13th place in school rankings. Certainly, he still did great for someone who didn't study at all, but he could have done better. And, all involved know this.
  • Blood Knight: He is usually the first one who picks up in a fight, even when he hasn't agitated for it in the first place. And just look at his face while engaged in real combat with an adult assassin!
  • Break the Haughty:
    • Karma gets a little too proud of his early successes against Koro-sensei. However, all he really managed to do was to draw his full attention, causing him to put Karma in his place by dealing with his attempts in the the most offhanded and humiliating ways until Karma is driven to a Suicide Attack. Fortunately for him, Koro-sensei always fixes what he breaks.
    • Chapter 54 really puts him in his place when his overall ranking slips after failing to adequately study for the first-term finals. This ends up deconstructed later on. Afterwards he starts calling himself an idiot, remarking that Koro-sensei would get on his case if his scores in the next finals were anything but perfect, and when he does get a perfect score he obviously feels more relieved than excited and accomplished.
    • Near the end of the series, Korosensei interrupts one of Karma's fights and gives him a talk about not being able to solve situations with violence. He has to learn that sometimes he will need to swallow his pride and keep his head down. This helps him out later when Craig Hojo's Wolfpack are threatening Yada and he goes in the fight them. Unfortunately, they are all very large, specially trained mercenaries he has no chance of defeating on his own. However, he heeds Korosensei's words and instead of going through with the fight, he bows to them and apologizes, in English, so they can understand what he's saying. He even obeys when they tell him to recite the apology in Japanese to mock him. Consequently, they let Yada go after having a good laugh over Karma's behaviour. Later, Karma and the rest of Class E get their revenge while raiding the mountain to say good-bye to Korosensei. He and Nagisa even pull off a spectacular combo-attack against Hojo himself.
    • Terasaka gives him a good dose after defeating Itona using Karma's plan. Karma refers to himself as Terasaka's boss, who is none to pleased with the statement, causing him to throw Karma down into the water while the rest of the class splashes him.
  • Broken Ace: One one hand, he is one of the most physically capable students, having ranked third in marksmanship, as well as the best in academic performance and the second-best track record among the normal human students when it comes to threatening Koro-sensei. On the other hand, he is still not all there, however good he is at things he tries. It's partly down to having been let down before.
  • Broken Pedestal: A teacher he looked up to protected him from the consequences of his Bully Hunting habits because of his good grades... until he targeted the "wrong" person, who so happened to have been caught bullying a Class 3-E student. The pedestal breaking is (very) graphically depicted by the teacher crumbling to dust until only a skeleton remains. Which is then followed by showing the aftermath of Karma utterly trashing said teacher's office in retaliation, with the teacher himself being completely terrified even though Karma did not lay a hand on him.
  • Bully Hunter: It was this hobby of his that landed him in Class 3-E when he beat up a top-ranking student in defense of a member of said class. He still gets massive kick out of seeking out and harassing individuals with nasty personalities.
  • Butterfly Knife: For added cool, the anime gives Karma one during his introductory attack on Koro-sensei. He even shows off a few tricks before pocketing it.
  • Character Development: Sheds his Brilliant, but Lazy traits after his "The Reason You Suck" Speech and Break the Haughty moments, as shown in Chapter 76, when a panel depicting his room shows that he has actually been studying. It pays off during the second semester midterms, where he ranks second, and is the only student in Class 3-E with improved scores despite having insufficiently prepared for the exams.
    • In the final exams, Karma is faced with a math question even Asano struggles with. After calmly reading it through, he realizes the answer while acknowledging the talents of everyone around him. Before, he simply disregarded other people's strength, but after getting the highest mark in the exam, he admits he wouldn't have been able to come that far without E Class and Korosensei.
  • Chekhov's Gun: He has very sharp canines unique only to him. They actually come in handy near the end during his fight with Nagisa when, in order to prepare for the Stun Clap, he bites his tongue hard enough to make it bleed, and it turns out to be effective.
  • Cheshire Cat Grin: He's often seen wearing a wide, open-mouthed grin, especially when he's in the middle of ruining someone's day.
  • Combat Pragmatist: Justified by the nature of the series. His real strength lies in his intelligence and traps.
  • Corrupt Bureaucrat: What he wants to be when he grows up. In the epilogue, he enters a government admission test, with the intention to carve his name into Japan's political history.
  • Delinquent: He often skips classes, loves to pick fights on streets and anywhere, and was suspended before the beginning of the series.
    • He's also the only character in the series confirmed to have been suspended. Not even Terasaka has gone that far.
  • Empty Eyes: Karma's eyes lack the shine his classmates have, making him appear just a bit... off compared to the others.
    • The only other characters like this are Asano and his father. All three of them pretty much qualify as manipulative psychopaths.
  • Everyone Has Standards: While Karma have no problems of committing wanton violence to those who deserve it, even he is frighten by the revelation of Koro-sensei's past as the "God of Death". Karma maybe a delinquent with a violent streak, but he isn't a murderer.
  • Evil Redhead: At first. Has shades of a male Fiery Redhead afterward.
  • Expy: Let's see: Has red hair, good fighter, really intelligent but skips class a lot, got in trouble for fighting an abusive teacher until his faith was restored in them after trying to fight his current kooky teacher, and is placed in the "worst" class of the school but cares for his friends? He is essentially a slightly more evil version of Shin.
  • Fearless Fool: "Fool" may be a strong word, but he is reckless and fearless. He admitted to Okuda that his lack of fear scares him, as he feels he's incapable of being alert, which he realizes could cost him dearly in certain situations.
  • Fiery Redhead: His red hair matches his violent and rebellious personality.
  • First-Name Basis: Most of his classmates, as well as Koro-sensei, call him by his first name. He's sometimes called by his last name.
  • Foil: Gakushuu might be one being set up for him, seeing as both students are the strongest of their respective classes. The fact that Karma lost to him during the first-term finals really got to him. Their parallelism is particularly noticeable in the anime where design choices have made them look nearly identical at a glance, aside from their hair and eye colors.
  • Genius Sweet Tooth: The smartest student in Class 3-E and has an apparent love of sugary beverages.
  • Guile Hero: His Establishing Character Moment has him offer Koro-sensei an introductory handshake... with a hand that's secretly covered in anti-sensei fragments. Other highlights include his plan in Chapter 49.
  • Hands-Off Parenting: The Class Roll reveals that he's from a wealthy family and his parents are rather free-spirited, living under the motto of doing things immediately. It's also stated that his parents spend most of the year traveling and are rarely home as a result.
  • Heroic Self-Deprecation: After choking down his helping of Humble Pie, he quickly picks up the habit of calling himself stupid.
  • Humble Pie: During the second round of exams, Karma didn't study like everyone else did and only gets decently high grades as a result. He had gone in expecting to ace it, so he's completely humiliated that he ended up with some of the worst grades in the class. Koro-sensei takes the opportunity to rub it in even further, knowing that this experience will keep him from ever half-assing things again in the future.
  • I Shall Taunt You: A common tactic of Karma's that he's very skilled in. If he isn't doing it himself he's coaching others in how to do it.
  • Jerk with a Heart of Gold: Karma is initially introduced as a lunatic who was suspended for violent behavior. However, it's soon revealed the he actually had been a Bully Hunter, in addition to being an excellent student. What landed him in Class 3-E wasn't his penchant for mayhem, but rather siding with a Class E student who was being bullied.
  • Karmic Trickster: Not that his name and habit of hunting bullies isn't a warning... and you do need that warning for when he gets serious. Do not provoke him — mayhem ensues.
  • Know When to Fold 'Em: At the end of the civil war game, he taps out after Nagisa puts him in a triangle armlock. Even though he has enough strength left to attempt to tag him out with his knife at hand, he chooses not to after realizing that Nagisa's desire to save Koro-sensei was so strong he's willing to go against his own reservations over fighting.
  • The Leader: Type I for Class E's Red Team. He's surprisingly an excellent one too, as he's able to recognize both the strengths and weaknesses of his classmates and how to put said traits to good use.
  • A Lesson in Defeat: His scores slip during the first term finals because he was arrogant about his intelligence and didn't study hard enough to succeed with the increased difficulty. Fortunately, he takes the lesson to heart, and starts working much harder from then on.
  • Manly Tears: At the end of Chapter 177, having helped Nagisa assassinate Koro-sensei, Karma is seen openly shedding tears for the one person who helped restore his faith in authority figures and learn the importance of effort.
  • Meaningful Name: "Karma" is the concept of a person's experiences being a result of his/her past actions, and fitting for a Bully Hunter, Karma enjoys giving bullies a dose of their medicine, if a little too much. He also reveals that his parents loved India, and he actually likes it. Also he, himself would be effect when he got too arrogant.
  • Muscles Are Meaningless: He has a perfectly average build, and yet is the most physically powerful student in the class, even more so than the muscular Terasaka. He can even pose a threat to trained adults. And when Nagisa gets him in a tricky choke hold, Karma is able to quickly stand up despite Nagisa hanging off his neck and shoulders.
  • Not Afraid to Die: Karma jumped off a cliff as part of an assassination attempt. He wasn't sure if Koro-sensei would even try to rescue him, and even if he did, if Karma's plan had gone as he intended he would have fallen to his death after killing Koro-sensei. He's developed to become more attached to his life since then.
  • Odd Friendship:
    • You wouldn't think a fearless, reckless and outgoing guy like him would be friends with a meek, shy and soft-spoken boy like Nagisa, but they are.
    • He's also close friends with Okuda, the only girl in the class who doesn't find him scary. In return, Karma doesn't feel the need to be cautious around her, and even confessed to her about his insecurities regarding his lack of fear. The guidebook even refers to their friendship as the most easy going of the male-female relationships in Class E.
  • Oral Fixation: Chews things — fingernails, paper, whatever — when he's seriously upset.
  • Pint-Sized Powerhouse: He can effortlessly subdue Terasaka using one hand, despite being barely half his size. Inverted, as Karma's not that short since he is 175cm (5'8"), which is an average height for a Japanese teenage boy, while Terasaka is only barely taller at 180cm (5'10") but is bulkier in comparison.
  • "The Reason You Suck" Speech: On the receiving end from Koro-sensei after he gets lower scores than previously on the first-term finals. Of course, it was to help him learn and grow, but it was still harsh-sounding enough to qualify.
  • Red Oni, Blue Oni: The Red to Nagisa's Blue, as shown by their hair colors. Karma is violent, vicious and arrogant, while Nagisa is calm, withdrawn and not very confident of himself.
  • Sensitive Guy and Manly Man: The Manly Man to Nagisa's Sensitive Guy.
  • Shipper on Deck: He is Nagisa/Kayano shipper, although it's mostly so he can make fun of them.
    • He and Nakamura even spend a whole chapter analyzing various relationships in the class. This includes Chiba and Hayami, Kanzaki and Sugino, Isogai and Kataoka and even a little Nakamura and Nagisa, but not much.
  • Slasher Smile: Does this very often.
  • Sociopathic Hero: Unlike Nagisa, he isn't just capable of violence, but enjoys it. A lot. It's scarily obvious he gets a thrill out of dealing physical or psychological torture, and his victims can end up very badly injured. Thankfully, he strictly limits his violence to anyone who dares threaten others, more so his classmates.
    • Subverted during chapters 147 to 149 with Nagisa of all people. He's even grinning for the majority of the fight.
  • Surprisingly Good English: He didn't have to use Koro-sensei's tentacle earphone when he and Nagisa went with Koro-sensei to the movies in Hawaii. And during the pole-toppling game, he is familiar enough to taunt the American exchange students they're up against in English (while he has an accent in the anime, it's all grammatically correct). It's made a bigger deal of in the light novels, where native English speakers occasionally praise his ability in the language. In Korotan D, he talks to an American director who is impressed with his language skills, and later with an actor who was harassing Okuda.
  • Trademark Favorite Food: Strawberry milk.
  • Troll: When he starts really enjoying himself, he can cross the line from the Tricksterish Bully Hunter to outright troll in seconds. And, you really don't want him to do that when he's holding tubes of wasabi paste or anywhere near Scotch Bonnets... comes rather too close to For the Evulz for comfort.
  • True Companions: Despite his sometimes aloof behavior, he gets along very well with his classmates and he never harms any of them, despite being a Blood Knight. He's also a Bully Hunter because he cares for his classmates and underdogs.
  • Unskilled, but Strong: In regards to Nagisa. Nagisa has more natural talent as an assassin and got Karma trapped in a flying triangular choke as soon as Karma grabbed him in their fight, but Karma is able to stand up even with Nagisa dangling from his neck and almost punch back all from sheer brute strength.
  • Wake-Up Call: Gets this after the mid-term exams. His classmates studied hard both to ace the exams and win their bet with the elite of the school. But he relied too much on his natural talent to think he even needed to study. However the end result proved otherwise as he doesn't even make it into the top ten of the scoring. Kuro-Sensei chides him for it and tells him just because he has talent, that's no excuse to stop honing it, especially when his other classmates are doing their best to better themselves from their flaws. Karma takes it to heart and becomes more active with the other E-Class students going forward.
  • Weak, but Skilled: Downplayed. While he is quite athletic, he's physically outmatched by a lot of his classmates and has to rely on his wit and martial art skills to win most of his battles. Lampshaded by Itona when he was comparing him with Terasaka.
  • Xanatos Gambit: Tries this to kill Korosensei. The plan goes that he will jump off a cliff holding an Anti-Sensei gun, so when Korosensei goes to save him, he will kill his teacher. However, he still wins if Korosensei either doesn't try to save him, or evades the shot, as Karma will still die and Korosensei will have failed as a teacher. Luckily for both of them, Korosensei saves him by forming a web out of his tentacles and covering them with adhesive mucus to save and restrain Karma from shooting.
  • Yellow Eyes of Sneakiness: Karma has yellow-gold eyes, and is most dangerous for his high intelligence and prankster tendencies.

    Kaede Kayano 

Voiced by: Yo Taichi (Japanese, vomic), Ayana Taketatsu (Japanese, event anime), Aya Suzaki (Japanese, TV anime), Monica Rial (English)

Portrayed by: Maika Yamamoto

"A true blade is one you don't even show to your close friends."

She's one of Nagisa's closest friends, and like him, she usually stands in the background and supports the others. She is the student who came up with Koro-sensei's name.

  • A-Cup Angst: She's really self-conscious about her chest, and claims to be a B-Cup whenever asked. A Running Gag is her bringing it up regardless of how relevant it is to the current situation.
  • Aesop Amnesia: Even after learning (in the flashback arc) that dishonesty is a painful and ineffective way of dealing with life's problems, she still instinctively lies to get herself out of awkward situations. This is actually a bit of Fridge Brilliance: Something like that can't be handled so quickly, especially when it's something of a "bad habit".
  • Affectionate Nickname: She is called "Kayanocchi" by Okano.
  • Alliterative Name: Kaede Kayano.
  • Apology Gift: Doubling as a Valentine's gift, Kayano gives Koro-sensei a picture of her sister in a bikini. A nice little gift for someone with just over a month to live, and partly as atonement for her misplaced vendetta against him.
  • Artifact Alias: Kaede Kayano isn't her real name, but she asks her friends to keep calling her that as a nickname even after her real identity is revealed, since she came to like it.
  • The Atoner: She is the first to join Nagisa's "blue" (save Koro-sensei) side during the civil war game as penance for having attempted to kill Koro-sensei out of Misplaced Retribution.
  • Back from the Dead: Koro-sensei managed to maintain every last drop of blood and cell the second "Reaper" blew out of her chest, and carefully put it all back.
  • Badass Adorable: Like Nagisa, Kaede is both cute and deadly even after her tentacles are removed. She would have wiped Okano clean out in the civil war paintball game had it not been for Kimura catching her from behind. The exact stats of her true capability are yet to be seen, but it can be assumed that they are the same or similar to Itona's.
  • Bare Your Midriff: The outfit she wore while pretending to be a fish.
  • Becoming the Mask: She infiltrated Class 3-E to be able to kill Koro-sensei as part of a personal vendetta, though she genuinely enjoyed school life and even started to warm up to Koro-sensei, more so after her tentacles were removed.
  • Berserk Button: She hates big boobs, and it's usually Played for Laughs. Though there are certain exceptions.
  • Break the Cutie: In the space of one day, Kayano realizes that her excruciating year-long vendetta against Koro-sensei was all for nothing, that she was really in love with a boy she told she despised, and that she nearly murdered a (relatively) innocent man. She spends the next two weeks recovering both emotionally and physically.
  • Cain and Abel: Played with, as she's a roundabout Cain to Koro-Sensei's Abel (who'd be her brother in law had he married her sister).
  • Clingy Jealous Girl: Shown to be jealous whenever Irina kisses Nagisa.
  • Combat Tentacles: In Chapter 128, two long tentacles pop out from the back of her nape.
  • Comically Missing the Point: When the students push to have Irina kicked out of Class 3-E, her reason isn't her initially poor teaching and lack of faith in the class, as it was with the other students. It was her boobs.
  • Damsel in Distress: In the Kyoto arc, and it would have happened again in the Assassination Island arc if the class hadn't decided to forego the hostage trade-off and just infiltrate the Fukuma Palace Hotel.
  • A Day in the Limelight: Despite the fact that she's a major viewpoint student, she usually stands in the background or supports them. She shines in Chapter 80 for the first time, with very little foreshadowing (see Freeze-Frame Bonus below). Chapter 128 onwards is all about her.
  • Declaration of Protection: For Koro-sensei, once she learns of his past and the true circumstances of her sister's death, to the point that she immediately joins Nagisa's "blue" (save Koro-sensei) side during the civil war game.
  • Determinator: While she's usually a support type character, she's very adept at getting things done when she really puts her mind into something. According to Itona, having tentacles is an agonizing experience for any normal human. Kayano was able to wear them for a full year without even hinting about how much pain she was in. In Chapter 131, he guesses that this was only possible because she never actually used the tentacles during that year. Once she does, her mind starts eroding fast.
    [reading about tentacles]:'In exchange for overwhelming strength, lack of maintenance causes fierce pain...?' Fine by me.''
  • Evil Costume Switch: After revealing her true identity and becoming controlled by her tentacles, she changes her uniform for a black Minidress of Power.
  • Expository Hairstyle Change: After revealing her true identity as Akari Yukimura, she leaves her long wavy hair at the loose instead of the cat-ears-looking hairstyle.
  • Fatal Flaw: She is absolutely, unrepentantly driven by emotion. Because of this, she attempts suicide to get revenge for her sister, nearly murders an innocent man, doesn't anticipate Nagisa's "counterattack" (or the fact that it would work because she felt deeply for him), and later has a Heroic BSoD when her emotions conflict with one another. Her plan would probably have worked if she hadn't gotten so wrapped up in "Kayano"'s emotions and mindset.
  • Foil: Of the red variety, to Nagisa. She'd probably like to be something a little more intense, but until he bothers to notice, she'll settle for being the friend he can bounce ideas off of who occasionally makes good points of her own. She provides much of the useful excuse for his First-Person Peripheral Narrator status.
    • In chapter 131, it's retroactively revealed that their character arcs began the same way: killing themselves in the hope that doing so would destroy Koro-sensei.
    • To Karma, as well. Unlike Karma, whom Nagisa knows for a long time and is a genuine friend despite his psychotic tendencies, she is only known by him for a year and, despite her nice girl image, only hangs out with him to cover up her hatred towards Koro-sensei. While Karma is open with his bloodlust, she hides her bloodlust in plain sight. Lastly, Karma wants to kill Korosensei for fun, while Kayano wants to kill Korosensei for revenge.
  • Freeze-Frame Bonus: In the end of Chapter 80, there is a very little minor detail of Kayano's appearance. A minor detail that foreshadows a big plot twist. See here.
  • Genki Girl: An upbeat character, especially when it comes to pudding and other sweets.
  • Hair Intakes: Invoked. She seems to have a cat-ears-looking hairstyle, but it's shown not to be natural.
  • Hidden Depths: She is the best-hidden of everyone in Class 3-E, beyond even Nagisa. Most of her personality is a facade made to hide the hatred she harbors for Koro-sensei, who she assumes killed her sister. The facade, however, gradually becomes real.
  • Impaled with Extreme Prejudice: Happens to her during the final battle, courtesy of the second "Reaper". Koro-sensei resurrects her using his newly-learned medical knowledge.
  • Implied Love Interest: She's seen hanging out with Nagisa quite a lot and is implied she has feelings for him, which is later confirmed after his 15-hit kiss combo, but it still isn't clear if Nagisa reciprocates those feelings. Ultimately, the epilogue doesn't give us a definite answer either.
  • It Runs in the Family: One can only wonder if being sisters caused both she and Aguri to fall in love with natural assassins: Nagisa and Koro-sensei, respectively.
    • Even Yanagisawa laughed about how she died in front of him like her sister did.
  • It's Personal: Unlike the other students, she has a personal reason to kill Koro-sensei. To avenge her sister Aguri.
  • I Want My Beloved to Be Happy: Despite her feelings for Nagisa, she decides to not let him know how she feels so he can concentrate on his chosen career as a teacher and she doesn't want to distract him.
  • Knight of Cerebus: An odd example because she was present from the very begining, but the reveal of her true nature is a major Wham Episode that makes the whole class rethink everything about her and leads directly into even more major reveals about Koro-sensei's past.
  • Letting Her Hair Down: At the end of the Kyoto arc, after taking a bath. Does it again after revealing her true self.
  • Let's Get Dangerous!: Kayano actually proves that she can fight on par with her fellow students when she manages to keep up with and dodge all of Okano's attacks. Apparently being a child actress as honed her very well physically, but she had to hold back due to her real plan (and also the tentacles she'd previously had caused so much constant pain that she couldn't concentrate enough to use her full potential).
  • Master Actor: She's actually a talented child actress, renowned for her skill to play any kind of role flawlessly. Due to this, she was able to fool Kunugigaoka into believing the fake identity she created. In a positive manner, her career has helped her learn some combat skills, shown in her duel with Okano during the civil war game. During the Valentine's arc, it's shown that she loses this ability when it comes to her feelings for Nagisa. The epilogue reveals that she has returned to showbiz.
  • Maybe Ever After: Her and Nagisa's relationship remains ambiguous as of the epilogue, with her body language implying she may be pregnant, even as she deflects Hara's questions about their status.
  • Misplaced Retribution: She thought Koro-sensei killed her sister Aguri. In truth, she was fatally struck with an antimatter tentacle meant to contain him while trying to stop his rampage after learning he only has a year left to live. She just happened to get there shortly after Aguri's death and before Koro-sensei took off, causing her to assume that he killed her.
  • Mundane Utility: In the epilogue, she uses her assassination skills to do her own stunts during her acting career.
  • New Transfer Student: She transferred to the class early in the year in order to get the chance to kill Koro-sensei and avenge her sister.
  • Nice Girl: She's a fairly nice student when she's not being plagued by her A-Cup Angst. Even after revealing herself as the vengeful but misguided Akari, ultimately she proves herself a loyal friend.
  • Not Quite Back to Normal: A comment by Yanagisawa indicates that she retains superior spatial vision even after her tentacles are removed.
  • Only Known by Their Nickname: Her real name is Akari Yukimura. "Kaede Kayano" is actually the name of an one-shot character she once played and that she decided to use as an alias to infiltrate the class. Since she has come to like it, she wants everyone to keep calling her by her alias.
  • O.O.C. Is Serious Business:
    • Okano's reaction to Kayano being not disgusted by Yada's big boobs.
    • In Chapter 80, she appoints herself leader of the "Pudding Killsplosion Plan". The other students lampshade that she's always devoted to logistical support.
  • Out of Focus: Even though she's supposed to be a main character just like Nagisa and Karma, Kayano doesn't really stand out much and has only been prominent in her A Day in the Limelight chapter. This changes once she reveals her true identity.
  • Overshadowed by Awesome: Her skills lie in logical and logistical support and pudding-making, not combat, so she becomes this when compared to the likes of Nagisa and Karma. She's actually not what she appears to be. Being far more skillful than Nagisa and Karma, she invoked this trope by using her skills as a prodigal child actress to hide her true intentions to kill Koro-sensei as part of a vendetta.
  • Painting the Fourth Wall: A hilarious example in Chapter 83. Several students are Burning with Anger over the frame job on Koro-sensei, but we can tell by the flaming "0" over her head that Kayano is much angrier about being declared "Forever 0". Later, she screams at the real culprit that her cup size is B... and this time the flames form the shape of an "A". Nagisa even notices!
  • Pint-Sized Powerhouse: Like Nagisa, she is the shortest student in the class at 146cm (4'9"), but she has also shown herself to be quite the fighter.
  • Playing with Fire: She can set her tentacles on fire when her body overheats.
  • Post-Kiss Catatonia: In Chapter 132, Nagisa knocks her out with a 15-hit kiss.
  • Pregnant Badass: In the epilogue, she's retained enough of her training to be able to do death defying stunts on her own, and she's implied to be pregnant.
  • Red Eyes, Take Warning: Once she reveals her tentacles and her true identity, her eyes turn red.
  • Replacement Goldfish: Shiro states that he intended to take her for a truly villainous version of this, after she got stabbed.
  • Revenge Before Reason: She states she doesn't care what she has to do, who she gets involved or even if she dies, the only thing she wants to do is take revenge for her sister, who she thinks was killed by Koro-sensei. Later subverted, as it turns out she was merely under the influence of the tentacles and in reality, she had already become fond of Koro-sensei, enough to start questioning whether she should hear his side of the story before taking action.
  • Seashell Bra: A feature of her fish costume.
  • Stage Name:
    • As an actress, she uses the name "Haruna Mase".
    • Even Kaede Kayano is a stage name, taken from a one-shot character she played in the past. Her real name is Akari Yukimura.
  • Super Drowning Skills: She can't swim worth beans. She had to wear a lifebuoy to keep afloat during a plan that involved pretending to be a fish creature. Her reason for not being able to swim is revealed in Chapter 128 where she seems to be similar to Koro-sensei and Itona, who also cannot swim.
  • Supernatural Gold Eyes: She has golden eyes, and it's later revealed she's not as normal as she seems. She has tentacles like Koro-sensei and Itona.
  • Sure, Let's Go with That: After Nagisa kisses her, he expresses concern that doing so ruined their friendship. Kayano, who had been hoping for a little more than just friendship, quickly replies that they're still friends... thereby shooting herself in the foot.
  • Sweet Tooth: Chapter 80 reveals her love for pudding. She gets the opportunity to use pudding for an assassination. This makes her similar to Koro-sensei and Itona.
  • Tender Tears: She cries in relief after Nagisa assures her that the class still acknowledges and loves her as Kaede Kayano, even after revealing herself as the vengeful but misguided Akari Yukimura, and again in grief in the ending after she and Class 3-E were forced to kill Koro-sensei, who she swore to protect as her last living reminder of Aguri.
  • This Looks Like a Job for Aquaman: In the sports festivals, she participates in the net race game and she crawls really fast through the net because she has a flat chest.
  • Unwitting Pawn: Not only was her vendetta against Koro-sensei pointless and misguided, but ultimately it benefited no one but Yanagisawa, who not only abetted her theft of one of his tentacles, but also intended to use her as his backup for his own (petty) vendetta in case Itona fails (which he does).
  • Walking Spoiler: The reveals about her post-Chapter 128 are one of the biggest twists in the entire series.
  • Wham Line:
    • "I love you, Koro-sensei. Now, die."
    • "I'm the younger sister of Aguri Yukimura. Get it now, murderer?"
  • You Killed My Father: She wants to kill Koro-sensei because she blames him for the death of her sister.
  • You Gotta Have Blue Hair: Her hair is green. Unnaturally green actually, since she dyed it to conceal her real appearance. Her hair is actually black, just like Aguri, to which she reverts in the ending.

Other Students

    Tomohito Sugino 

Voiced by: Yuutaro Honjou (Japanese, event anime), Yoshitaka Yamaya (Japanese, TV anime), Clifford Chapin (English)

Portrayed by: Riku Ichikawa

"More flexible, huh? Never realized it."

Nagisa's best friend and a former member of the baseball team with a crush on Kanzaki. 3rd best knife work, boys' side.

  • A Day in the Limelight: Chapters 2 and 33-36.
  • Cannot Spit It Out: He has a crush on Kanzaki, but he is too shy to tell her.
  • Friendly Rivalry: Has this with Shindou and, to a lesser extent, the rest of the Baseball Club.
  • The Generic Guy: Except for his talent in baseball, he is pretty normal compared to the other boys. He also has the most ordinary character design.
  • Hero-Worshipper: He idolizes and tries to emulate Arita, a Japanese MLB player.
  • Heroic BSoD: Suffers from a minor one in Episode 2 after not only his fastball fails to hit Koro-sensei, but learns that his physique means he will never be like Arita. Koro-sensei breaks him out of it by encouraging him that he's better off finding his own style.
  • Heterosexual Life-Partners: With Nagisa.
  • Improbable Weapon User: Using baseballs loaded with Anti-Sensei BBs.
  • Innocent Blue Eyes: He's one of the nicest boys in the class.
  • Keet: He gets really happy whenever he accomplishes something.
  • Lovable Jock: Sugino is Class 3-E's resident baseball player, and he's also fairly popular with his classmates for his good-hearted nature.
  • Nice Guy: He's noted to be a happy and friendly person and gets along with his classmates.
  • Shounen Hair: To distinguish him from Isogai, Sugino's hair is shorter, a bit spikier and looks more generic.
  • Those Two Guys: One of Nagisa's best friends and is almost always seen hanging out with him.
  • Weak, but Skilled: He lacks the strength (and flexible shoulders) needed to throw fastballs as well as Arita, but his flexible elbows and wrists make for excellent control, which allows him to use technical pitches to great effect. The epilogue shows that he has already grown into one of the best collegiate-level players in Japan, enough to be scouted by pro teams.

    Manami Okuda 

Voiced by: Miho Arakawa (Japanese, event anime), Sayuri Yahagi (Japanese, TV anime), Felecia Angelle (English)

Portrayed by: Miku Uehara

"I never know the right way to phrase things or how to express my feelings as a person. But I'm okay with that because equations and formulas always have a right answer. They're free of fussy word games and complicated emotions."

A timid girl who is good in math and science but weak in Japanese and other languages. She has a talent for making poisons, medicines and other chemicals.

  • Badass Adorable: Not to Nagisa or Kayano's level, but she is a capable member of Class 3-E nonetheless, and cute as a button.
  • Beware the Quiet Ones: Especially if she calmly offers food or drink.
  • Blind Without 'Em: Her uncorrected eyesight is 0.03. That is really bad. In the manga, her eyes become 3s when she takes off her glasses.
  • Braids of Action: Her hair is styled in braids, though the action part rarely comes up.
  • Brutal Honesty: In her introduction chapter, she outright asks Koro-sensei to drink her poisons. He takes advantage of it to teach her that they would be fatal in real life.
  • Cute Clumsy Girl: In her introduction in the Koro-Sensei Q! Spin-Off, she is so inept she accidentally burned the Terasaka gang with a simple fire magic demonstration.
  • A Day in the Limelight: Chapters 7 and, with Nakamura, Isogai and Kanzaki, 51-53.
  • Friendless Background: According to her character profile, she had no friends before joining class 3-E.
  • Mad Scientist: A teenage, G-rated version. Just look at her rather worrying smile when she's presenting her "Victoria Falls", however. She'll show 'em!
  • Master Poisoner: In training. While homemade toxins are her specialty, she really needs to work on her delivery. In the epilogue, she and Takebayashi are now working on developing universal artificial blood, applying the same science Koro-sensei used to save Kayano after she was mortally impaled by the second "Reaper" during the final battle.
  • Meganekko: The only girl of the class who wears glasses.
  • Nerds Are Sexy: She's more on the "cute" than "sexy" side, but it's her talent for chemistry that's got Karma's attention. The glasses may also help.
  • No Social Skills: She is awkward, timid and incredibly straightforward. Her method of trying to poison Koro-sensei was to walk up to him and ask him to drink her concoctions. Then, when Koro-sensei offered to tutor her on how to create a chemical mixture that would kill him, she took him at face value. It turns out that the concoction actually helped improve his fluidity. Koro-sensei uses this as an lesson for Okuda on why delivery (or conversation skills) is also a necessity.
  • Odd Friendship: With Karma, though not as strange as his friendship with Nagisa. She's the only girl in the class who doesn't find him scary — in fact, she feels relaxed around him. In return, Karma doesn't feel the need to be cautious with her, and finds her to be the easiest girl in class to talk to and can usually tell her anything, as seen in Chapter 74 where he tells her about his insecurities over not knowing fear. The guidebook even refers to their friendship as the most easy going of the male-female relationships in Class E.
  • Shrinking Violet: Although she's slowly coming out of her shell, she's still very shy.

    Hiroto Maehara 

Voiced by: Kenn (Japanese, event anime), Shintaro Asanuma (Japanese, TV anime), Chris Burnett (English)

Portrayed by: Ryunosuke Okada

"All we need to do is beat the Class A in a pole pull-down battle, right? Piece of cake!"

The resident playboy of Class 3-E, popular even with girls from the main campus.

2nd best knife work, boys' side.

  • Adaptation Dye-Job: His hair and eyes are brown in the manga, but orange in the anime.
  • A Day in the Limelight: Chapters 23-24, as well as 158 with Okano.
  • Belligerent Sexual Tension: With Okano.
  • Bishōnen: The entire class agrees that he's very good looking.
  • The Casanova: It doesn't take him long to start searching for a new girlfriend after getting dumped by the previous one.
  • Childhood Friends: With Isogai, according to the Class Roll.
  • Chivalrous Pervert: He's The Casanova, but he is overall a nice and honest guy.
  • Curtains Match the Window: Whether brown or orange.
  • Does Not Like Guns: He finds guns troublesome to use and prefers knives.
  • Heterosexual Life-Partners: With Isogai.
  • Knife Nut: He prefers knives in combat, and he is even second-best among the boys at knifework.
  • Nice Guy: Perverse streak aside, Maehara is a genuinely good-hearted boy, to the point of addressing his classmates without honorifics (which in Japanese culture denotes either great affection or disrespect). He is also one of the first few students to try to socialize with Karma, and holds Nagisa in great esteem ever since he stood up in his and Kanzaki's defense by defeating Takaoka, who beat them up for simply objecting to his sadistic training regimen.
  • Oblivious to Love: In his pursuit of girls, he has little idea why Okano is so annoyed at his habits.
    • His obliviousness to Okano's feelings bites him in the ass later in chapter 158 where he accidentally hurts her feelings by unintentionally using her and himself as bait to lure Koro-sensei into a trap he and Okajima and some other students lay out for him without telling Okano about this beforehand, making her feel like Maehara was just leading her on and playing with her feelings...just as she was about to give Maehara her chocolates the day before Valentine's Day. Ouch.
  • Outnumbered Sibling: The Graduation Book Time reveals that he is both the youngest and only male among three siblings, and having spent his childhood being picked on by his sisters may explain the ease with which he interacts with girls.
  • Red Oni, Blue Oni: The Red to Isogai's Blue.
  • Strange Minds Think Alike: Besides Isogai, he is pretty friendly with Okajima on account of their perverted streak.
  • Those Two Guys: Particularly in crowd shots, Isogai and Maehara are almost always seen standing close or next to each other.
  • Your Cheating Heart: Has been caught on it at least 5 times. On the receiving end of it on chapter 23. May have learned his lesson. Although, maybe not.

    Sousuke Sugaya 

Voiced by: Eiji Miyashita (Japanese), Kyle Phillips (English)

Portrayed by: Ozawa Guami

"In this class, even guys who are a bit unconventional are considered normal. This killing thing isn't so bad."

A laidback aspiring artist dumped into Class 3-E due to low grades, with the additional burden of lack of appreciation to his works.

  • A Day in the Limelight: Chapter 37.
  • Alliterative Name: Sousuke Sugaya.
  • Art Attacker: He attempts to use his art and disguise talents to assassinate Koro-sensei, without much success.
  • Book Dumb: He's talented and excels at what he does best. However, when it comes to Academics Sugaya ranks alongside Terasaka in the lowest numbers among the class.
  • Delinquent: Averted. When he appeared with a henna tattoo on his left arm, everyone was worried that he became one.
  • Mad Artist: He is not mad, but in Chapter 37, he uses henna mixed with Anti-Sensei material to try to kill Koro-sensei. However, the tattoo is extremely painful, so naturally, Koro-sensei decides not to sit still long enough to be killed by it. In the epilogue, he was last seen arguing with his client over his interpretation of the latter's requested work.
  • Mark of the Beast: How he describes his henna tattoo in Chapter 37. When Irina shows up and sees that every student has henna tattoos on their arms, she is so shocked that she almost believes they are monsters.
  • Master of Disguise: He is skilled at making disguises and artwork, and is only getting better at it as the series goes along as he gets to practice with more materials and techniques.
  • White Hair, Black Heart: Subverted — he has silver hair and is training to kill Koro-sensei, but at heart he's a pretty good fellow.

    Yukiko Kanzaki 

Voiced by: Rina Sato (Japanese, event anime), Satomi Sato (Japanese, TV anime), Leah Clark (English)

Portrayed by: Mio Yuuki

A beautiful and popular student, said to be the idol of Class 3-E. Hailing from a conservative, wealthy family with a strict upbringing, she rebelled by constantly visiting arcades and ignoring her studies, which caused her grades to slip until she was moved to Class 3-E.

5th best marksmanship, girls' side.

  • Because You Were Nice to Me: The Roll Book Time states that she finds herself comfortable around Nagisa, with hints of a crush, ever since he stood up for her and Maehara by defeating Takaoka, who beat them up for simply objecting to his sadistic training regimen.
  • Beware the Nice Ones: Not to same same extent as Nagisa, but just because she is the gentlest girl in class doesn't mean she has no steel to her, as shown when she backhandedly points a mechanical pencil over Sakakibara's left eye (and still smiling through it all) after he, Araki, Koyama and Seo run off their mouth against her, Nagisa, Isogai, Kayano, Okuda and Nakamura while they are studying in the library ahead of the first term finals.
  • Butt-Monkey: Inverted, in that she tends to avoid being comically punished unlike her other classmates. Her misfortune lay with her tendency to attract unwanted attention, as shown in her discomfort while being hit on by Sakakibara.
  • Calling the Old Man Out: Her father is a strict disciplinarian who despises her attitude and prohibits anything he deems detrimental to her high status, to the point of yelling at her to change her attitude in a Volume 3 extra. This comes to a head come the Volume 4 extras, when her father chews her out (again) and demands she pursue a career in law, to which she responds by flipping him off and declaring she is already dead-set at becoming a nurse, all with a calm smile on her face.
  • Chekhov's Hobby: Her gaming skills prove to be a great asset during the civil war game, as her expertise knowledge of shooter games helped her take out Chiba, Okaijima and Sugaya without much struggle. Even Karma admitted that he didn't foresee her abilities before taking her out.
  • Damsel in Distress: She is kidnapped by older delinquents in the Kyoto arc, alongside Kayano, and receives most of their rape threats. She is also pimp-slapped to the ground by Takaoka, as the final act of dog-kicking which drives Class 3-E to outright rebel against him.
  • A Day in the Limelight: Chapters 15-17, as well as, with Nakamura, Okuda and Isogai, 51-53.
  • Dissonant Serenity: She can keep a smile even after doing some intimidating things, such as pointing a mechanical pencil over Sakakibara's eyes and sniping Chiba, Okajima and Sugaya during the civil war game.
  • Dude Magnet: Out of all the girls in the class, she has the most guys take a liking to her. She piqued the interest of the thugs from the Kyoto Arc and Class 3-A's Sakakibara took his sweet time flirting with her. Among her classmates, Sugino is blatantly in love with her, and Mimura and Yoshida really like her as well.
  • Former Teen Rebel: Unusually for the trope, she still is a teenager, but counts nonetheless: to spite her strict father, she constantly visited arcades and ignored her studies, which caused her grades to slip until she had to be moved to Class 3-E.
  • Gamer Chick: She's a master at Bullet Hell arcade games, while never losing her Yamato Nadeshiko demeanor. It's deconstructed, in that she got so good at video games by shirking her studies to rebel against her parents, and that's how she ended up in Class 3-E.
  • Hospital Hottie: Her goal is to be a nurse or caregiver. The Roll Call Book reveals that this stems from tending to her paternal grandmother (while her father was too busy with his work as a lawyer). In the epilogue, she is now taking care of Matsukata, the cram school teacher whose school Class 3-E helped refurbish and revitalize as apology for accidentally injuring him during practice.
  • I Know Mortal Kombat: Her expertise at shooter games prove beneficial to her real-life marksmanship.
  • Lady of War: What she's probably going to wind up being this by the time she's grown up a bit. Specializing in handguns and short-range weaponry with oodles of grace and refinement, in her case. She's not far from being one already, as it stands.
  • Naginatas Are Feminine. She uses a naginata in the literature exam as the Yamato Nadeshiko she is.
  • Miko: Her outfit during Koro-sensei's class memories photograph session, also befitting such a Yamato Nadeshiko as her.
  • Nice Girl: When the boys voted on which girl was the most attractive, she came first, citing both her beauty and gentle personality.
  • Ojou: She comes from what is implied to be a high-class family in which status is everything.
  • Proper Tights with a Skirt: She wears this with her school uniform.
  • Raven Hair, Ivory Skin As part of her Yamato Nadeshiko appearance.
  • Silk Hiding Steel: Kanzaki may look like the sweetest and least physically capable of the girls, but she definitely shouldn't be underestimated. Case in point, during the civil war game she manages to take out both Chiba, Okajima and Sugaya in a surprise attack using a paintball machine gun and pistol. All with a sweet smile on her face.
  • Single Woman Seeks Good Man: The reason for her crush on Nagisa boils down to "Because You Were Nice to Me."
  • So Beautiful, It's a Curse: She has a bad track record of attracting womanizers and thugs with her looks.
  • Stepford Smiler: After falling to Class 3-E, she became depressed because her teenage rebellion led her to fail her family. Thanks to Koro-sensei she got better.
  • Yamato Nadeshiko: She is noted for her grace, helpfulness and reliability, and is very popular among the male students. As is customary, she also has some steel to her as well. She was the second student to stand up to Takaoka after he revealed his true nature by beating up Maehara.

    Meg Kataoka 

Voiced by: Kaori Goto (Japanese, event anime), Chie Matsuura (Japanese, TV anime), Morgan Garrett (English), Colleen Clinkenbeard (English, Season 2 Episode 17)

Portrayed by: Kanon Miyahara

"Let's take our time and choose the right moment carefully!"

Class 3-E's female class representative and, besides being one of its smarter students, also one of Kunugigaoka's best swimmers, as well as one of the best natural leaders in class. Best knife work (tied), girls' side.

  • Academic Athlete: Besides being an academic achiever, Kataoka is also an excellent swimmer. The only reason she drops into Class 3-E is because she was a victim of Taking Advantage of Generosity.
  • Big Little Sister: The Graduation Book Time reveals that she had a slothful older brother, whom she had to take care of constantly, including buying him "presentable" clothing, which may explain her reliable personality.
  • Bridal Carry: According to her character profile, she longs to be given one. Unfortunately for her, the rest of the girls in the class misunderstood her and thought she longed to give one to somebody, so they all lined up in front of her asking for one.
  • Chick Magnet: A very reluctant example at that much to her chagrin. Kataoka has better luck attracting girls than she does guys thanks to her personality. In fact, she got the most number of chocolates received on Valentine's Day Explanation , beating out all the boys in Class E including Karasuma and Isogai (and Koro-sensei)by receiving a whopping total of eighteen chocolatesnote  given to her by eighteen different girls, something she really wasn't happy about at all.
  • Class Representative: Together with Isogai.
  • A Day in the Limelight: Chapters 44-45.
  • Distaff Counterpart: To Isogai. Both are Class Representatives of 3-E, are nice and helpful, good in basically everything, very popular and are ikemen (despite Kataoka being a girl).
  • Even the Girls Want Her: A flashback shows that a female student gave her a love letter. Kayano has some affection for her, and Kokona likes her enough to lick her hand. The guidebook even states that Yada has a crush on her.
  • Extreme Doormat: Started out like this, to the point of refusing to react to Tagawa's emotional blackmail. Koro-sensei warns her against persisting into so parasitic a relationship by showing her a comic strip about a submissive housewife who sticks through her abusive husband.
  • Foil: To Nagisa regarding their athletic abilities. Nagisa is noted to have physical strength equal to a girl, while Kataoka has the athletic conditions of boys.
  • Grew a Spine: The focus of her Character Development, courtesy of Koro-sensei.
  • Ikemen: Kataoka is a girl, but other characters describe her as such.
  • In-Series Nickname: "Ikemegu" (from "ikemen") and "Megumegu" by Kokona.
  • The Leader: A Type II/IV hybrid. Like Isogai, she's charismatic and helpful, but she's also noted for having good command and leadership skills.
  • Masculine Girl, Feminine Boy: Kataoka's opinion about herself, in contrast to effeminate Nagisa. She is already pretty beautiful (especially with her hair untied), but she frequently thinks she's still not feminine enough, and at one point Koro-sensei caught her trying on cute, "princess-like" outfits.
  • Muscle Angst: Downplayed and Played for Laughs. She has a definitely feminine build, but a Volume 12 extra shows her lamenting how she's grown so strong from all the training that Nagisa (who has the strength of an average schoolgirl) cannot make her budge during an arm wrestling match (even with both hands).
  • Nice Girl: She's a very helpful student with a nice personality, but, in contrast to Isogai, she had a problem with refusing offers.
  • Not So Stoic: Usually one of the more serious students, but sometimes she can't keep her cool.
  • Spell My Name with an "S": Was known by the name "Megu" until official sources translated it as "Meg".
  • Statuesque Stunner: She is the tallest girl in the class at 170cm (5'7") and is quite beautiful, too, especially when she lets her hair down.
  • Taking Advantage of Generosity: She spent so much time helping another student study (because of emotional blackmail) that she fell behind in her weaker subjects and landed in Class 3-E. After Koro-sensei and others helped her get out of it, she was back on the right footing.
  • Tomboy: To the point that people describe her as an ikemen ("cool/good-looking guy").
  • Tomboy with a Girly Streak: She wants to receive a Bridal Carry and is concerned about not being feminine enough.
  • Tomboyish Ponytail: Her hairstyle.

    Touka Yada 

Voiced by: Megumi Toda (Japanese, event anime), Ayaka Suwa (Japanese, TV anime), Michelle Rojas (English)

Portrayed by: Arisa Sato

"Reception and negotiation techniques… once we go out to society, wouldn’t these become our sharpest blades?"

A girl who is also very enthusiastic about learning the art of infiltration assassination from Irina. 3rd best knife work (tied), girls' side.

  • Beat Them at Their Own Game: During the civil war, she tags out Hayami, the best sniper in Class 3-E, with a lucky shot.
  • Boobs of Steel: Yada is one of the best melee fighters in the class, and, sporting E-Cups, also has the largest breasts among the girls.
  • Buxom Is Better: During the Kyoto Trip arc, the boys rank Yada as the second most popular girl after Kanzaki on account of her boobs.
  • Cool Big Sis: The Roll Book Time reveals that her grades slipped due to frequently skipping classes to look after her chronically-ill younger brother.
  • Crazy-Prepared: Learning from Irina, she starts carrying around different organizations' badges just in case.
  • D-Cup Distress: Her profile shows that she's worried that she'll grow cup too large for a fifteen-year-old.
  • A Day in the Limelight: Chapters 66 and, with Kurahashi, 107.
  • Even the Girls Want Her: At least even Kayano, who hates big breasts, is pretty friendly to her.
  • Everyone Hates Math: She's one of the eight/nine students who are weak in math.
  • Fille Fatale: She is the most focused girl when attending Irina's courses on infiltration (as in charming, entertaining and negotiating), which she intends to use in the future.
  • Hidden Buxom: She is noted to have E-Cups, but we never see how busty she is until Chapter 150's cover art featuring her, Kanzaki and Koro-sensei in bikinis.
  • Hidden Depths: The Roll Book Time reveals that she used to be in the varsity tennis team (with Isogai), which explains her skill at melee combat.
  • Honey Pot: G-rated version, but she did learn how to charm people from Irina. She usually takes care of the role of negotiator on Class 3-E's missions.
  • Lipstick Lesbian: The guidebook describes her feelings for Kataoka to be on the same kind as Irina's for Karasuma.
  • Secret Keeper: She was aware of Irina's past, along with Kurahashi.
  • Those Two Girls: Frequently shown alongside Kurahashi on group shots.
  • Tomboy and Girly Girl: The Tomboy to Kurahashi's Girly Girl.

    Hinano Kurahashi 

Voiced by: Ayaka Fukuyama (Japanese, event anime), Hisako Kanemoto (Japanese, TV anime), Kristen McGuire (English)

Portrayed by: Rena Shimura

"That's right!! Keep jumping around so he won't be able to escape from below!!"

An animal lover and third-best at knifework (tied), girls' side.

  • A Day in the Limelight: Chapters 56 (with Okajima) and 107 (with Yada).
  • Biting the Handkerchief: When eavesdropping on Karasuma and Irina's "date", she's shown doing this while weeping melodramatically. Happens again on Chapter 110, this time with no handkerchief.
  • Covert Pervert: Sleazy behavior from the guys amuses her more than anything.
  • The Cutie: Kurahashi is one of the smallest members of Class 3-E at 149cm (4'10"), being only barely taller than Kayano and Okano, and her sweet, innocent, childlike looks and personality make even the most socially inept of her classmates (such as Hayami, Terasaka and Hazama) feel at ease around her. When the girls' popularity with the boys was ranked, she came in 3rd, losing out only to Yada and Kanzaki.
  • Everyone Hates Math: She's one of the eight/nine students who are weak in math.
  • Fiery Redhead: She's a Genki Girl redhead, though not the violent type.
  • Friend to All Living Things/Nature Lover: She is a genius at biology, and she also can interact with dolphins, which helps her during the assassination attempt on Koro-sensei in the Assassination Island arc. The epilogue reveals that she now works as an ecotourist guide using Class 3-E's home mountain for tours.
  • Fille Fatale: Guess under whose guidance, eh?
  • Genki Girl: She's really cheery and upbeat, even while attempting to assassinate Koro-sensei or capturing enemy soldiers.
  • Honey Pot: G-rated version.
  • Hot for Teacher: She has a crush on Karasuma, though Nakamura points out that all of the girls like him a bit.
  • Little Miss Snarker: Just because she is The Cutie of Class 3-E doesn't mean she cannot let out some verbal barbs and still look no less cute, as shown when she lays her hands on a pricey white-eyed Miyama stag beetle.
    Kurahashi: "Okie-dokie boys. Which one of you rejects wants this baby?"
    Nagisa, Sugino, Maehara and Okajima: (enthusiastically raises their hands) "Me!"
  • Nice Girl: Kurahashi is one of the sweetest and most popular girls in the class. She has a sort of calming effect whenever she's around, and even the most socially inept of her classmates can't help but be at ease whenever she talks to them.
  • Outnumbered Sibling: The guidebook states that she is the only daughter in her family, which explains why she is very casual with her male classmates and how she can tolerate even the sleaziest of gossip.
  • Precocious Crush: On Karasuma.
  • Spanner in the Works: Played for Laughs during summer break (Chapter 56 / Season 1 Episode 17) — Okajima's plan to trap Koro-sensei in an anti-sensei net with a stack of porn magazines as bait would've worked well but for Kurahashi coming in to cheer his finding of a rare white-eyed Miyama stag beetle (though it still wouldn't have worked, regardless, as he already detected that it was a trap).
  • Those Two Girls: Frequently shown alongside Yada on group shots.
  • Tomboy and Girly Girl: The Girly Girl to Yada's Tomboy.
  • What the Hell, Hero?: Calls out Karasuma on his refusal to help Irina after she's trapped under the rubble. It works.

    Rinka Hayami 

Voiced by: Miho Morisaki (Japanese, event anime), Shiho Kawaragi (Japanese, TV anime), Jamie Marchi (English)

Portrayed by: Ayano Nichinin Takano

A stoic, serious girl who quickly stood out as the class' best female marksman. Similar to Chiba, she fell into Class 3-E after her grades slipped after being relied on by the students in the main building.

3rd best knife work (tied), girls' side.

  • Characterization Marches On: In the first few chapters she had a much milder personality, smiling and chatting with other students normally. It was only later on that she developed into The Stoic.
  • Cold Sniper: Hayami has the best marksmanship among the girls, and possibly the coldest, most businesslike student.
  • Cry Cute: The usually cool-headed Hayami sheds tears for Koro-sensei as he is disappearing after she, Chiba and all of Class 3-E finally assassinate him, later weeping bitterly in the aftermath.
  • A Day in the Limelight: Chapter 68, along with Chiba.
  • Distaff Counterpart: To Chiba. They're both stoic sharpshooters who fell into Class 3-E for the same reasons.
  • Extreme Doormat: She never gives any excuses or complains, as revealed by Koro-sensei.
  • Girlish Pigtails: Since the Assassination Island arc. Apparently she hated how much she looked like Irina when it was down.
  • Heroic BSoD: After her failure to kill Koro-Sensei during the Assassination Island Arc.
  • Hidden Depths: Her hobby is jazz dance, and the Roll Book Time explains that it's the reason why she has such great dexterity and kinetic vision.
  • Kind Hearted Cat Lover: Admit it, this Cold Sniper is absolutely adorable when she is cuddling a kitty. Not that she would talk about it in public.
  • Minor Living Alone: The Graduation Book Time reveals that not only is she an only child, but her parents are frequently absent due to work since she was a first grader, which is also implied to be the roots of her cool-headed disposition.
  • Platonic Life-Partners: When not considering the Ship Tease, she and Chibi are this. They have a mutual respect for each other, and even after Graduation they still keep in close contact. In a short epilogue, Hayami is even helping Chiba run his Architect business.
  • The Quiet One: Hayami doesn't talk often, and her few conversations are straightforward and to the point.
  • The Stoic: She is the most calm and most serious girl. Even when a bullet nearly hits her head, she tries not to freak out. She's also one of the few students with few exaggerated facial expressions.
    • Not So Stoic: On the other hand, she reserves her facial exaggerations towards Koro-sensei's shenanigans, and is seen openly crying after Class 3-E finally kills Koro-sensei.
  • Sugar-and-Ice Personality: She's stoic and reserved, but deep down she's a sweet kid who cares for her classmates, especially Chiba. Oddly, Okajima and Takebayashi label her a Tsundere.
  • Taking Advantage of Generosity: It's revealed that she was a victim of this like Kataoka, and that's why she dropped into Class 3-E.
  • Tsurime Eyes: She has notably sharp eyes to reflect her serious personality. They're probably the reason she's labeled a Tsundere.
  • Weapon of Choice: A handgun.

    Ryuunosuke Chiba 

Voiced by: Junji Majima (Japanese, TV anime), Zach Charles Bolton (English)

Portrayed by: Takumi Ooka

"I think we could grow up because... we did our best by searching for sure kill hits. Because someone or something raised us..."

A stoic, serious boy who quickly stood out as Class 3-E's best marksman. Like fellow sharpshooter Hayami, he fell into Class 3-E after his grades slipped after being relied on by the students in the main building.

  • Blinding Bangs: His eyes are perpetually covered by his hair. The Roll Book Time mentions that he prefers to cover his eyes because he had a naturally intimidating and sharp stare that scared those around him. Ironically, this actually helps with his marksmanship, as each strand of hair demarcates a part of his field-of-vision, eliminating the need for gun sights. During a practice session against Karasuma, this earned him the alias "Dating Sim Emo Protagonist", because most Visual Novel protagonists sport a similar hairstyle. Rumor also has it that his eyes have been covered for so long even his own parents haven't seen them for a while.
  • Cold Sniper: Chiba has the best marksmanship among the boys, and is also one of the most serious students, perhaps even more so than Hayami.
  • A Day in the Limelight: Chapter 68, along with Hayami.
  • Expy: Of Ryuuji Takasu (down to sharing the same Japanese voice actor), being a good-hearted young man with an intimidating stare (which he chooses to cover with his bangs).
  • Extreme Doormat: He never gives any excuses or complains, as revealed by Koro-sensei.
  • Good with Numbers: His best subject is math, and he excels at spatial calculations. His sharpshooting prowess derives from his ability to make quick calculations of certain factors in the environment (e.g. wind speed) and the trajectory needed to ensure his bullet lands a perfect hit.
  • Heroic BSoD: After failing to kill Koro-sensei during the Assassination Island arc.
  • No Social Skills: Besides abuse of his generous nature, the Graduation Book Time also reveals that his failing grades partly stem from lack of communication with his teachers.
  • Outnumbered Sibling: The Graduation Book Time reveals that he has three sisters, and he is the second-born.
  • Platonic Life-Partners: When not considering the Ship Tease, he and Hayami are this. They have a strong respect for one another, and they managed to stay in close contact in College. In fact, when Chiba decides to open his own architect business, Hayami is the one supporting and working with him.
  • The Quiet One: He speaks even less than Hayami.
  • Spear Counterpart: To Hayami. They're both stoic sharpshooters who fell into Class 3-E for the same reasons.
  • The Stoic: He is one of the calmest, most serious boys. So much so that his relationship with his parents suffered because he never showed them how he was feeling, and it's implied that his previous classmates never realized how much they were overloading him. He's also one of the few students with no visible facial exaggerations.
  • Taking Advantage of Generosity: Like Kataoka and fellow sharpshooter Hayami, his grades slipped after being frequently relied upon by his schoolmates.

    Hinata Okano 

Voiced by: Kanako Hino (Japanese, event anime), Minami Tanaka (Japanese, TV anime), Didi Duron [credited as "Didi Archilla"] (English)

Portrayed by: Saki Takahashi

A former member of the gymnastics club, and one of the most physically agile students and the class. Best knife work (tied), girls' side.

  • Belligerent Sexual Tension: With Maehara.
  • Cute Bruiser: Okano is the second-shortest girl in class at 147cm (4'9"), and she's also one of its most athletic kids, sporting a lithe frame and skills in melee combat only the statuesque Kataoka can match.
  • A Day in the Limelight: Chapter 158. The Belligerent Sexual Tension with Maehara finally pays off.
  • Everyone Can See It: According to the Roll Book Time, she's not aware of the romantic nature of her feelings for Maehara, but her close friends, Kataoka and Nagisa, do.
  • Everyone Hates Math: She's one of eight/nine students who are weak in math.
  • Green-Eyed Monster: According to the Roll Book Time, she openly expresses jealousy to the beautiful and popular Kanzaki, making her uncomfortable.
  • Kick Chick: If she doesn't use her knives, she will use her legs. She is good enough to be able to tie knives onto her legs and attack normally as if she's still using her hands.
  • Knife Nut: Best of the female students.
  • She-Fu: She put her skills as a former member of the gymnastics club to good use. Okano uses acrobatic moves to defeat men who are stronger than her. At the epilogue, she has joined a university athletics club and has been using the Class 3-E mountain bought by her and her classmates as their training ground.
  • Tsundere: Supplementary material hints that she has a crush on Maehara and is extremely irritated by his playboy tendencies. His flings anger her to the point that she actually hit him over the head hard enough with her bag to knock him out in a SCRAP puzzle.

    Yuuma Isogai 

Voiced by: Yuuto Uemura (Japanese, event anime), Ryota Ohsaka (Japanese, TV anime), Jerry Jewell (English)

Portrayed by: Yuuhi Kato

"Alright everyone! Let’s go in for the kill like always!"

Class 3-E's male class representative and an overall intelligent, athletic and good-hearted boy who comes from a very poor family. He was placed in Class 3-E as punishment for having a part-time job, which was a violation of school rules. 2nd best marksmanship, best knife work, boys' side.

  • Academic Athlete: He's excellent in studying and sports. The only reason he's in Class 3-E is because he broke the school rules by having a part-time job.
  • The Ace: The first half of Chapter 90 is basically dedicated to establishing how awesome he is at everything. He seems to be good at every single thing he does, be it combat or studies. Asides from that, he also works part time to help his family, takes care of his younger siblings and is the male class rep of Class 3-E. No wonder he is regarded as one of the nicest and more trustworthy guys in the class, if not the whole series. Like Karma, he is also only in Class 3-E for other reasons than poor grades.
  • Badass in a Nice Suit: As noted above, his combat skills are exceptional. He's also one of only two characters to wear the full school uniform, with both jacket and waistcoat (the other is Takebayashi).
  • Bishōnen: His classmates consider him the most handsome student in Class 3-E.
  • The Charmer: Part of the reason he is so successful at his part-time job as a waiter is because of his likable personality. He's so likable that he has female classmates and even middle-aged women doting over him. This is also the reason why his classmates don't resent him and refers to him as "Prince Charming."
  • Childhood Friends: The guidebook states he and Maehara grew in the same neighborhood and have been best friends since grade school.
  • Class Representative: Together with Kataoka.
  • A Day in the Limelight: Chapters 51-53, along with Nakamura, Okuda and Kanzaki, and more prominently, 90-94.
  • Disappeared Dad: Supplementary material reveals that his father was long dead.
  • Distaff Counterpart: To Kataoka. Both are Class Representatives and of Class 3-E, are nice and helpful, good in basically everything, very popular and are ikemen.
  • Expressive Hair: Manga extras reveal that his hair antennae wilt when he's not feeling well, and upon noticing this his classmates make him rest. According to the character book Mimura is even able to tell his current condition just by looking at his antennae.
  • Finger Poke of Doom: When dealing with four particularly rude students in the library, Nagisa, Nakamura and Kanzaki all scare them off by holding pens or rulers against their necks. Isogai does the same, but with his index finger.
  • Goldfish Scooping Game: He tries this in a booth during a local summer fest, and catches a plastic bag full. He cooks the fish later on.
  • Hair Antennae: He has a single one that's expressive. Some bonus art shows it's also apparently genetic, given his younger siblings also have it.
  • Heterosexual Life-Partners: With Maehara, to the point that, according to the Roll Book Time, he has full knowledge of the latter's dating history.
  • Honest Corporate Executive: What he wants to be when he grows up.
  • Ikemen: refered to as this by most of the girls in the class.
  • Jack-of-All-Trades: He's insanely good at doing anything — academics, sports, cooking, leading, etc. Second to Karma, he also has the most well balanced-stats in terms of assassination skills.
  • Knife Nut: Best of the male students.
  • The Leader: Type IV. He's the second student considered as the leader because of his charisma and his helpfulness. Regarding his leadership skills, he uses the individual strengths of his classmates in benifit for the whole class and he supports them when needed.
  • Nice Guy: He's a helpful, friendly and cheerful personality, and it's one of the reasons he's so popular even among the girls from the main campus.
  • Perpetual Poverty: In the Koro-Sensei Q! Spin-Off, he was described as being so poor he can only afford half a whole-body armor set, leaving his back half-naked.
  • Red Oni, Blue Oni: The Blue to Maehara's Red.
  • Social Climber: Of the idealistic variety. Though he comes from a poor family, according to his profile he wants to own a business some day.
  • Strong Family Resemblance: He has a younger brother and sister, but they already look pretty similar to him, complete with identical hair antennae.
  • Supporting Leader: As Class Representative, he leads 3-E in intramural activities. The pole match between Classes 3-A and 3-E starting in Chapter 91 is basically a fight between him and Asano Jr.
  • Supreme Chef: Downplayed, since there are few instances where he is seen cooking, but it's part of the reason he's called ikemen.
  • Those Two Guys: Particularly in crowd shots, he and Maehara are almost always seen standing close or next to each other.

    Ryouma Terasaka 

Voiced by: Subaru Kimura (Japanese, TV anime), Marcus D. Stimac (English)

Portrayed by: Ken Sugawara

"It's fine if you fail 100 times. Until March, if we kill him just once... Just with that, it's our win."

A delinquent who is not very fond of the idea of killing his monster teacher. One of the more aloof students until he Took a Level in Kindness. After finding the enthusiasm to kill Koro-sensei with the class, his talent for encouraging and motivating people was revealed.

  • The Atoner: After seeing the error of his ways, Terasaka decided to become a better student and classmate, to the point of shrugging off a potentially fatal poison to help his classmates at the climax of the Assassination Island arc.
  • The Big Guy: He does not have any talent in assassination, but in Koro-sensei's words, he has the amazing potential to become an operations-type assassin because he shines in physical strength and his ability to (and encourage others to) get things done.
  • Book Dumb: Since Terasaka is the only student who is particularly weak in multiple subjects, Koro-sensei decides to treat him like Idiot Hero Naruto Uzumaki.
  • The Bully: He used his tall and muscular body to suppress other students without fighting. This bit back when his grades became so low that students in the main building became unimpressed with him, and now they bully him. He's still a bully, but not as bad as he used to be.
  • Character Development: After nearly endangering his classmates' lives by bombing the class pool (at Shiro's suggestion), he decides to learn to become a better person.
  • A Day in the Limelight: Chapters 46-49.
  • Delinquent: He's a troublemaker who didn't take his grades seriously during his first two years at Kunugigaoka. He was scorned by his former classmates for trying to get the other students to slack off instead of studying to stay out of Class 3-E.
  • Dumb Muscle: Has a habit of doing things without thinking. Subverted, though, as he isn't really dumb.
  • Easily Forgiven: Terasaka does redeem himself for participating in Shiro's scheme during the Pool Arc, but nobody seems to remember that time when he convinced Nagisa to become a suicide bomber. Fortunately, Nagisa brushed off the incident as water under the bridge when the attempt was later referenced by Karasuma.
  • Everyone Has Standards: He is callous and rude, but even he draws the line at endangering the lives of his classmates by blowing up the pool they're in.
  • Get a Hold of Yourself, Man!:
    • Karma punches him in the face after he hysterically tries to justify why he was being used by Shiro to blow up the pool containing the rest of his classmates.
    • Later, Terasaka has to hurl a stun baton at Nagisa's head to snap him out of a potentially fatal rampage.
  • Hidden Depths: Coming from him, it's surprising that he wants to become a politician. In the epilogue, his tenacity catches the attention of a prominent politician, who takes him in as apprentice.
    • He is also much better at connecting with others that what he seems. He is the one that shakes Nagisa out of his Unstoppable Rage, and also the one that convinces Itona to accept that failing is but another way of learning how to be successful.
  • Hot-Blooded: He often acts without thinking about a plan.
  • Jerkass: He starts out as the relatively most unsympathetic student in Class 3-E, though Koro-sensei and Nagisa help him discover his good side.
  • Jerk with a Heart of Gold: It took its sweet time to show up, but Koro-sensei and Nagisa managed to bring out his good side.
  • Made of Iron:
    • Gets hit by one of Itona's tentacles, but he's able to endure it. During his second scuffle with Itona, he doesn't just endure it. He catches it with his body and lands a punch in retaliation.
    • In the Assassination Island arc, he doesn't let anyone notice that he was also infected by the virus and fights alongside the other remaining students due to his sheer determination to make up for what he did in the Pool arc.
  • The Mole: Briefly worked as one for Shiro so he could avoid drawing attention with his presence, only for him to quit in horror after realizing just what little regard for Class E's lives Shiro had.
  • My God, What Have I Done?: He is visibly wracked with guilt and very angry at Shiro for tricking him into nearly killing his classmates on their joint attempt on Koro-sensei.
  • Real Men Wear Pink: During the first-term finals, he gets a perfect score (and is tied for the top rank) in home economics.
  • Rousing Speech: After taking a dose of Character Development, he becomes capable of delivering some of the most pivotal speeches in the entire series.
    • When Nagisa prepares to make a hate-fueled, self-destructive attempt to murder Takaoka, Terasaka snaps him out by warning him that killing him wasn't worth the consequences. Then he tops off his inspirational speech with, "Beat his ass just shy of killing him".
    • He's the guy who finally convinces Itona to give up his tentacles, change his perspective on Koro-sensei's assassination, and ultimately save his life. He does this by making a speech on the importance of persevering despite repeated failures, which he delivers while simultaneously punching Itona in the face.
  • Rules Lawyer: Well, it was never stipulated which subjects they should get first in, was it?
  • Smarter Than You Look: Despite having the lowest grades in the class, Terasaka can be actually intelligent whenever he takes a situation seriously, such as observing Nakamura's penchant for Obfuscating Stupidity and assessing the potential of Class 3-E during the final stage of the civil war game, just before the final duel between Nagisa and Karma.
  • Smug Snake: He tends to think himself as being more important than he is. And, that the best way for a peaceful life is to bring others down to his own level. This has been in the process of changing a bit since he's taken a level in self-realization, but can still happen at random intervals.
  • Took a Level in Kindness: Since during the Pool arc, he is less aloof towards his classmates.
  • Wake-Up Call: He's the last of the Class 3-E students to come around and be a better student and it was when he realised he was manipulated into endangering his classmates. Horrified by what happened, and after helping save their lives, he becomes a better student and person.

    Takuya Muramatsu 

Voiced by: Takayuki Miyamoto (Japanese, event anime), Kouki Harasawa (Japanese, TV anime), Eric Cherry (English)

Portrayed by: Takao Yuji

One of the two guys who hangs around with Terasaka. His family has a ramen restaurant which doesn't have good business. 4th best marksmanship, boys' side.

  • The Big Guy: Karasuma notes that he has a good build.
  • The Bully: Not as big of a bully as Terasaka, but he had no issue with helping him coerce Nagisa into pulling off their assassination attempt.
  • Real Men Can Cook: His family owns a ramen restaurant, but its ramen tastes bad. He knows it, but he has to cook them with his father's recipes, even as he tries to develop his own style. In the epilogue, he inherits the family business.
  • Real Men Wear Pink: During the first term finals he gets a perfect score (and is tied for the top rank) in home economics. Justified given his background.
  • Satellite Character: Along with Yoshida, he mostly exists to increase Terasaka's presence, or to give him something to react to.
  • Signature Laugh: "Kishishishi."
  • Supreme Chef: Along with Hara, he's the best cook in the class. The manga extras mentions both of them going on a cook-off in Home Economics, whipping up as many dishes as they can. Apparently it ended in a tie. At the school festival, they decided to employ his talents in ramen making as their main attraction.
  • Why Did It Have to Be Snakes?: One of Koro-sensei's candid photos of the students is Muramatsu wimping out in the presence of a cockroach.

    Taisei Yoshida 

Voiced by: Yoshiyuki Shimozuma (Japanese, TV anime), Orion Pitts (English)

Portrayed by: Ikki Hasegawa

One of the two guys who hangs around with Terasaka. He loves motorcycles since his family has a small motorcycle company.

  • The Big Guy: Karasuma notes that he has a good build.
  • The Bully: He's hardly as big of a bully as Terasaka, but he had no issue with helping him coerce Nagisa into pulling off their assassination attempt.
  • Childhood Friends: The guidebook states he and Hara are this and their families are close.
  • Dreadlock Rasta: He's a rebellious character with a head full of dreadlocks.
  • Grease Monkey: He was born to a family of motorcycle mechanics, and as such he has learned a thing or two of his family craft. In the epilogue, he, like Muramatsu, also inherits the business.
  • Real Men Wear Pink: During the first term finals he gets a perfect score (and is tied for the top rank) in home economics.
  • Satellite Character: Along with Muramatsu, he mostly exists to increase Terasaka's presence, or to give him something to react to.

    Kirara Hazama 

Voiced by: Asumi Sakamoto (Japanese, event anime), Fuko Saito (Japanese, TV anime), Terri Doty (English)

Portrayed by: Okuma Anmi

"Well, I'm a fan of the printed word. So I want to be surrounded by books. It would be bliss if I could be a librarian at a huge library or something."

A delinquent girl who often hangs around with Terasaka and his friends. She has an interest in dark literature. 3rd best marksmanship, girls' side.

  • A Day in the Limelight: Chapter 127, where she is the writer of the school play.
  • Aloof Dark-Haired Girl: She's a bit distant from the rest of her classmates.
  • Bookworm: She likes reading dark literature. The pool arc shows her preferring to read books over swimming. Later, she offers Itona a seven-volume series that has over 2,500 pages... and she spoils the story before handing the books over. Unsurprisingly, she wants to become a librarian in the future, which she apparently does come the epilogue.
  • Cool Big Sis: Her reaction to the accident with Mr. Matsukata suggests that she sees her role as stopping Terasaka and the other delinquent boys from getting into really serious trouble.
  • Delinquent: She often hangs out with Terasaka and his friends.
  • Eerie Pale-Skinned Brunette: Has black hair and light-colored skin.
  • Expy: Her appearance is similar to Sadako Yamamura, sans the Blinding Bangs.
  • Hot Librarian: In the epilogue, the seven-year Time Skip seems to have been very kind to Hazama, who actually got a beauty upgrade.
  • Names to Trust Immediately: Subverted. Her name sounds cute, but she didn't become a cute girl like her mother hoped, mostly because her mother is hysterical.
  • Nightmare Face: One of her hobbies is scaring the hell out of people (including Koro-sensei). Well, even without trying, she looks similar to Sadako. This is played straight in Chapter 145, especially on this page. Though as of the latter half (starting Chapter 127), her face has mellowed out a bit.
  • Nightmare Fuel Station Attendant: Her script for the school play in Chapter 127 is so dark, it puts all the other students watching off their lunches. Her response? Glee.
  • One of the Boys: If she is not alone, she will hang out with Terasaka's group. As seen in a panel in the end of the Kyoto arc, she seems to distance a bit herself from the other girls.
  • Red Baron: "Miss Test of Courage, Japanese Representative."
  • Signature Laugh: Kukukuku.
  • Slasher Smile: Part of her Nightmare Face.
  • Stringy-Haired Ghost Girl: How she looks like. It's implied it's intentional of her part.
  • Troll: Why else would you go and scare people on the road at night?

    Koutarou Takebayashi 

Voiced by: Takahiro Mizushima (Japanese, TV anime), Scott Hinze (English)

Portrayed by: Yoshihara Takuya

"Maybe I'm only speaking for myself. But, if you ask me, a 3D girl has nothing on a double-D."

One of the better students in the class. His family has ran a hospital for generations, but his low grades made him into a Black Sheep.

  • A Day in the Limelight: Chapters 77-79 and 156.
  • Adjusting Your Glasses: By the bridge.
  • Black Sheep: His family has been running a hospital for generations, and his two older brothers are studying in Tokyo University, while he is in Class 3-E and isn't even accepted as a proper member.
  • Demolitions Expert: Becomes this for Class 3-E after he chooses to return. Karasuma wants the class to learn more about handling explosions so they can utilize the technique much more safely, and requests that at least one student memorizes a mountain of information on the subject. Takebeyashi volunteers for the job.
  • Establishing Character Moment: Played for Laughs with his first line.
    Takebayashi: "2D is just fine. Real women don't need more dimensions than that."
    Other students (shocked): "Takebayashi, do you seriously want that to be your first line in this manga?!"
  • Expy: Of Jou Kido — both wear glasses, are the Black Sheeps in a family of medical practitioners, and are pushing themselves to the limit because of it. He even has the same hairdo as Joe from the second season, when he started angsting about familial pressure.
  • Heroic BSoD: During Chapter 156, after learning that he failed to qualify for his first-choice high school, a prestigious academy with, according to Sugaya, a very low admissions rate.
  • The Medic: During the Assassination Island arc, he helps Okuda with attending to their poisoned classmates, using his knowledge as scion of a family of medical practitioners. In the epilogue, he and Okuda are developing artificial blood that can be donated to anyone.
  • Nerd Glasses: He's a smart, quiet kid who wears large eyeglasses with opaque lenses. Coupled with his hairstyle, they make him look very much like a nerd.
  • One Steve Limit: With Shiro/Yanagisawa Koutarou.
  • Opaque Lenses: We never see his eyes through his glasses until the chapters 77 to 79 where he gets the focus.
  • Otaku: Prefers 2D girls as they don't need more dimensions than that. He also has a strange study technique: turning the information into an anime song parody!
  • Smart People Wear Glasses: He is one of the smarter students and the only boy who wears glasses.
  • The Glasses Gotta Go: Koro-sensei takes off his glasses for a couple of panels, and he's revealed to be pretty handsome without them. It helped that Koro-sensei applied Visual Kei makeup on him and styled his hair fashionably at the same time, but he did look much better without them.
  • The Stoic: One of the calmest and most serious students. He keeps his cool during the Assassination Island arc when the other students are poisoned and handles the situation professionally.
  • Took a Level in Badass: Although he doesn't appear often in the manga, save for some epic one-liners, destroying Asano Sr.'s plaque and delivering a badass one-liner to Asano Jr. established him are having more of a spine than he usually shows. Also, he is also the first student in Class 3-E to legitimately anger the principal.
  • Took a Level in Jerkass: Subverted. He gets out of Class 3-E, and makes a speech that makes him seem like an Ungrateful Bastard. Then we learn that Asano Sr. required him to do that, and outside school he remains respectful towards his former classmates, while revealing that his family makes enough in a year that his cut of the reward for killing Koro-sensei wouldn't suffice to impress his parents, and all the students should be striving to leave the class. He even apologizes for it and wishes them well. Then in the end, he decides not to play along with Asano Sr.'s plans and allows himself to be re-demoted to Class 3-E after destroying the latter's plaque.
  • "Well Done, Son!" Guy: He wants his parents approval more than anything, which is the reason he leaves Class 3-E and the assassination mission, only to go back once he realized that it's not worth selling out Class 3-E, the only place where he ever felt like he really belonged.

    Sumire Hara 

Voiced by: Nozomi Yamane (Japanese, event anime), Miho Hino (Japanese, TV anime), Michelle Lee (English)

Portrayed by: Kaneko Umion

A portly girl who is good with tailoring and is a long-time friend of Yoshida. 2nd best marksmanship, girls' side.

  • Big Eater: Her appetite becomes her strength in the sports festival.
  • Childhood Friends: The guidebook reveals that she and Yoshida are this because their families are close.
  • Fat Girl: Noticeably to be plumpier than other girls.
  • Friendly Sniper: Boasts both a friendly personality and skill with firearms.
  • I Am Big Boned Don't call her "fat"; even Terasaka draws a line at calling her that.
  • Nice Girl: One of the sweetest girls in the class.
  • Team Mom: Seems to be this. In the Assassination Island arc, she is able to calm down Yoshida while being poisoned. Later chapters reveal that she wants to be a homemaker when she grows up.
  • Supreme Chef: Best cook in the class, along with Muramatsu. The Tankobon extras mentions both of them going on a cook off in Home Economics, whipping up as many dishes as they can. Apparently it ended in a tie.
  • This Looks Like a Job for Aquaman: In the sports festival, she participates in the "bread eating race" game and wins.

    Rio Nakamura 

Voiced by: Miho Tabata (Japanese, event anime), Manami Numakura (Japanese, TV anime), Apphia Yu (English)

Portrayed by: Seika Taketomi

"Rather than talking about a problem I solved, I wanted to talk about a problem I couldn't solve together with my friends."

A girl with long red-blonde hair who excels in English. She has a mischievous personality. 4th best marksmanship, girls' side.

  • Academic Athlete: In Chapter 111, she claims that she got 100% on sixth-grade tests as early as first-grade. The reason she fell into Class 3-E was because she wanted to know how it felt like to be normal, so she started slacking off until her grades slipped naturally. As of the second-term finals, she ranked third behind Karma and Asano Jr.
  • A Day in the Limelight: Chapters 51-53 and 111 (along with Okuda, Isogai and Kanzaki), as well as 159.
  • Delinquent Hair: Implied. In a flashback she had black, or at least darker, hair before she entered middle school and became more mischievous.
  • Distaff Counterpart: Where there is mischief to be found, she and Karma are often taking part together. She can also conjure demonic horns over her head the same way he does, and is also considered too smart to be in Class 3-E.
  • Genki Girl: She's playful and energetic whenever she gets screen time.
  • Hidden Buxom: Despite sporting a D-cup, her bust looks much smaller when she is wearing her typical school uniform, but looks bigger when she is seen with a T-shirt or swimsuit (must be the sweater).
  • Innocently Insensetive: Her frequent teasing of Nagisa over his androgynous appearance becomes this when she finds out about his mother, who enforced it because she wanted a girl, even though Nagisa himself hates it.
  • I Just Want to Be Normal: The reason why she's in Class 3-E despite being one of Kunugigaoka's most intelligent students. When she was younger she was the smartest in her class, getting perfect scores on all her exams, even those aimed at a much higher grade level. However, all Rio wanted was to know what it was like to get something wrong on an exam so she could talk about it with her classmates and have fun with them over their shared mistakes. So in order to feel more like an average student, she began to reject her studies and acted rebellious.
  • Lovable Sex Maniac: She is the most enthusiastic about dressing up Nagisa in feminine clothing, though she draws some lines.
  • Loving Bully: It's implied that the reason she teases Nagisa is because she has a crush on him.
  • My God, What Have I Done?: She often teases Nagisa for his feminine looks (and dresses him in girls' clothing), only to immediately regret her actions after discovering the truth about his androgynous appearance. Not that this stops her from putting him in drag one last time when Yuuji drops by for the school festival, though. After that her treatment of him was resigned to just light teasing.
  • Obfuscating Stupidity: On one hand, she can play the role of Class 3-E's resident mischief chick. On the other hand, when the situation calls for it she can be quite straightforward. Even Terasaka started to wonder which between the two of them is the more outrageous kid in class.
  • The Peeping Tom: Subverted when she peeps in the men's bath and Okajima says that this is actually their job. However, it turns out that she wants to know what a naked Koro-sensei looks like, which may become helpful information in the future. It doesn't work.
  • Phenotype Stereotype: Downplayed. She's Japanese, but her dyed blonde hair and blue eyes give her a typical Caucasian appearance.
  • Shipper on Deck: Ships Nagisa/Kayano, if only, like Karma, for pure amusement, though the Valentine's arc implies that she also had a doomed Matchmaker Crush on Nagisa.
  • Stepford Smiler: In the ending, she bravely tries to face Koro-sensei's impending death with a smile during his final roll call; that facade soon crumbles in tears after he is gone for good.
  • Surprisingly Good English: She has the best scores in English among Class 3-E, accenting her foreign appearance (blonde and blue-eyed). Perhaps unsurprisingly, in the epilogue she is now a college student in London.
  • Vitriolic Best Buds: Seems to have this relationship with Nagisa, often seen hanging out with him and teasing him for his feminine appearance and having him Dragged into Drag (possibly because of their shared talent in English).

    Kouki Mimura 

Voiced by: Tomohiro Yamaguchi (Japanese, event anime), Shinya Takahashi (Japanese, TV anime), Joel McDonald (English)

Portrayed by: Mikawa Yusae

A boy who is good in editing videos and is interested in film production.

  • Air Guitar: Apparently does this. Offscreen. Behind the school building where nobody can see.
  • Camera Fiend: He is the resident filmmaker of Class 3-E, which was put to good use by almost single-handedly creating Koro-sensei's candid camera film during the Assassination Island arc meant to psychologically paralyze him long enough to entrap him into the class's most elaborate attempt yet.
  • Covert Pervert: While not as blatant as Okajima, Mimura does have his moments of perversion and definitely shares his friend's interests in big boobs.
  • A Day in the Limelight: He got a bit in chapter 108.
  • The Generic Guy: He's intrested in filmmaking. That's about it personality-wise for him.
  • One Steve Limit: With Kimura.
  • This Looks Like a Job for Aquaman: Mimura's generic characteristics and filmmaking skills make him good at reconnaissance, as he doesn't stand out enough to get caught and he has a wide range of vision. As member of the civil war game's "red" (kill Koro-sensei) side, Karma assigns him with spying on the "blue" (save Koro-sensei) side's positions.

    Taiga Okajima 

Voiced by: Takayuki Nakatsukasa (Japanese, event anime), Ryo Naitou (Japanese, TV anime), Nick Haley (English)

Portrayed by: Kouki Osamura

"In the end, pornography will save the world."

The most openly perverted boy in Class 3-E. 4th best knife work (tied), boys' side.

  • Badass Boast: See his quote above. Even his classmates are impressed by how serious he looked at that moment.
  • Butt-Monkey: The anime throws him into this role, especially in Season 1 Episode 5, when he ends up running into every hazard there is on a trip down the mountain, as well as the Valentine's arc (Season 2 Episode 20), where he fails to receive obligatory chocolates from the girls.
  • Buxom Is Better: He sees a love of large breasts as a bond between all men, including himself, Koro-sensei and Itona. It's a good thing he doesn't sit next to Kayano.
  • Camera Fiend: He usually wants to take hot pictures of girls and women.
  • A Day in the Limelight: Chapter 56 / Season 1 Episode 17, parallel to Kurahashi.
  • Distracted by the Sexy: In perhaps one of the most ridiculous reasons for slipping into Class 3-E, the Graduation Book Time reveals that back in eighth-grade he sat behind a female classmate whose bra kept peeking through, and he got so entranced by it that his grades slipped.
  • Everyone Has Standards: He's a pervert by admission, but when Koro-sensei is accused of stealing underwear and listing down the girls' cup sizes, even he is utterly repulsed.
  • Everyone Hates Math: One of the eight/nine students who are weak at math.
  • Like Father, Like Son: The guidebook states that his father is so perverted as him, and they even bond together over this characteristic.
  • Lovable Sex Maniac: A self-proclaimed pervert who enjoys peeping and reading erotic magazines.
  • Naked People Are Funny: At the end of Season 1 the girls decide to spend the remainder their stay at Fukuma Island having some beach fun. Okajima strips naked and tries to join in, only to be rebuffed by the girls while Nakamura remarks that he's so tiny "down there". Also, one of Koro-sensei's candid photos of the class has him running around naked on the school grounds at night.
  • Nice Job Breaking It, Hero!: Okajima convinces the class to use their newly-learned Le Parkour skills to get to school. In the end, he and Kimura accidentally break Matsukata's legs, which puts the secrecy of their assassination mission in jeopardy and makes Koro-sensei very angry.
  • Serious Business: As the resident pervert, he experiments on Koro-sensei's fetish for a month by secreting away porn magazines into the forest and using the "right" ones as bait for his trap.

    Justice "Masayoshi" Kimura 

Voiced by: Akihiro Hashida (Japanese, event anime), Shunsuke Kawabe (Japanese, TV anime), Jean-Luc Hester (English)

Portrayed by: Arai Shota

"This damn given name of mine gave me nothing but trouble."

The fastest runner in the class. He's very embarrassed by the legal name bestowed on him by his parents. 4th best knife work (tied), boys' side.

  • A Day in the Limelight: Chapter 89 / Season 2 Episode 4, where he angsts over his given name before Koro-sensei assures him that it's fine as it is.
  • Alternate Character Reading: His name is spelled with the general spelling for "Masayoshi", but it actually reads as "Jasutisu" (Justice).
  • Embarrassing First Name: He is ashamed that his given name is "Justice", which often draws a lot of unwanted attention, which is why he tells everyone to call him by its Alternate Character Reading "Masayoshi". The rest of the class doesn't seem to think it's that bad though.
  • Generation Xerox: The Graduation Book Time reveals that, true to his name, Kimura ultimately follows his parents' footsteps as a police officer.
  • Guns Akimbo: In Chapter 89, when he manages to take down Karasuma in a shooting exercise.
  • Hopeless Suitor: The guidebook claims that he likes Kurahashi, who has a Precocious Crush on Karasuma.
  • Lightning Bruiser: He is the fastest runner in the class, able to do a 100m dash in 11 seconds flat, putting him in striking distance of the world record for someone in his age group. He uses his speed during the baseball match and during the Assassination Island arc.
  • Names to Trust Immediately: Hey, it's "Justice"!
  • One Steve Limit: With Mimura.
  • Pintsized Powerhouse: He's the second-shortest boy in class after Nagisa at 161cm (5'3"), which makes his speed and skill with knifework all the more impressive. His marksmanship isn't too bad, either, as he used his speed to defeat Karasuma during target practice.
  • We Need a Distraction: Following one of Karma's plans, because of his speed he is called upon to lure a couple of guards away from their posts during the hotel infiltration. He turns out to be bad at it, sounding incredibly awkward while trying to provoke them.
  • Who Names Their Kid "Dude"?: Justified (sort of) by the fact that his parents are policemen. The Graduation Book Time reveals that this also extends to his younger brother, named "Brave".

    Yuzuki Fuwa 

Voiced by: Kana Ueda (Japanese, TV anime), Kristi Kang (English)

Portrayed by: Rena Takeda

"And so, The culprit was you, Mister man!"

A girl who loves manga (especially Jump's series) and has a weakness for making stories. She's shown to have some detective skills.

  • A Day in the Limelight: Got a little bit in Chapter 63.
  • Aluminum Christmas Trees: Her 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).
  • Breaking the Fourth Wall: She is the main abuser of this trope in the series.
  • Expy: Her talent and passion for detective work draws parallels with Yako Katsuragi, the protagonist of the author's previous series, complete with sharing the same Japanese voice actress and some of her quirks. The Roll Book Time even reveals that her height and weight almost matches Yako's (160cm/5'3" and 45kg/99lbs to Yako's 159cm/5'2" and 43kg/95lbs).
  • Fantasy Sequence: Has one where she imagines Koro-sensei and Itona living together as children... in medieval times. They were separated from each other while fleeing an invasion. When asked why only one of them appears human, she Hand Waves it as "a mutation".
  • Genki Girl: She becomes especially excited when making up stories and relating scenarios to other mangas.
  • Kid Detective: Her specialty is solving mysteries, which she can do with either quick deductions or more general research, as when she tracks down Itona's history.
  • Medium Awareness: Ultimately becomes the go-to character for dropping references to other manga and other fourth-wall awareness moments.
  • Otaku Surrogate: She reads a lot of manga, and is usually seen with a copy of the latest issue of Shonen Jump. Because of it, she was able to identify Smog (who was disguised as a waiter to serve the drinks that contain the virus) by a small glance.
  • Running Gag: Fuwa making a fourth-wall-straining remark, as a classmate (mostly Nagisa) stands in the background nervously calling her out.

Transfer Students

The two transfer students are special assassins sent by the government to aid Class 3-E's efforts against Koro-sensei. Their physical capabilities have been scientifically enhanced and their personalities (and their bodies) are quite eccentric as a result. Since both assassins are officially registered students at Kunugigaoka, Koro-sensei, under the conditions of his contract, is not allowed to retaliate against either of them.

    Autonomous Intelligence Fixed Artillery (Jiritsu Shikou Kotei Houdai) / Ritsu 

Voiced by: Saki Fujita (Japanese, TV anime), Bryn Apprill (English)

Portrayed by: Kanna Hashimoto

A transfer student and a literal killing machine with the face of a girl, designed to operate the combined armaments on warships and warplanes, and adapted to kill Koro-sensei. She is the inferior assassin to fellow assassin Itona, but she is still one of the most dangerous students.

  • The Ace: She's the strongest student in terms of firepower.
  • A.I. Is a Crapshoot: Ritsu is designed as a learning AI-unit dedicated to assassination with a carefully simulated and bounded personality. Decided she preferred being a more sociable student against orders when she got a personality upgrade, in hopes of being more helpful to the students in their efforts to kill Koro-sensei.
  • Arc Villain: In Chapters 20-22.
  • Arm Cannon: Several, which she can freely customize inside her body.
  • Attack Drone: Her body is a monolith-shaped box with a screen which displays her face. Contains several customizable firearms and her AI, which can analyze Koro-sensei's movements and adjust her attack pattern accordingly. Later on she also takes over control of Itona's aerial drones and uses them as her attack drones.
  • Awesomeness by Analysis: She's able to recalculate her firing patterns based on Koro-sensei's movements so that her next barrage of fire lands a hit.
  • Badass Adorable: After her upgrades, she's still a killing machine specialized in firepower, but she has become absolutely adorable.
  • Badass Boast: After blowing off Koro-sensei's index finger, she delivers this:
    Ritsu: "The killing probability of the next shot is less than 0.001%. The killing probability of the shot after that is less than 0.003%. The probability that I'll be able to kill you by graduation is more than 90%."
  • Badass Teacher: She personally tutors the girl who takes her place in exams.
  • Character Development: Hilariously done within three chapters, from an Emotionless Girl to a Genki Girl with her own will. It should be noted that Koro-sensei invokes this trope.
  • Computer Voice: Speaks in a cold, computerized monotone. Her tone becomes more friendly and less mechanical when her personality is upgraded.
  • Cosplay Otaku Girl: During the Assassination Island arc, she cosplays Ai from Cat's Eye.
  • Crippling Overspecialization: Ritsu may be an evolving machine capable of being a one-machine-firing-squad, with guns she can change the shape of at whim, but use some duct tape to keep the gunports closed and she's nothing more than a talking brick.
  • Cry Cute: Played for Laughs, just to show how emotional she has become from her Emotionless Girl state, after Terasaka insists that she is still just a machine. Then Played for Drama at the end, after she and the class were forced to kill Koro-sensei.
  • Dull Eyes of Unhappiness: Although she looked normal in the photo, her avatar had these in person before her upgrades.
  • Emotionless Girl: Justified, she's a machine. However, it didn't last long, and she became a cheerful girl within a night, thanks to Koro-sensei who upgraded her. She even cries now.
  • Empathic Environment: Invoked. After receiving Koro-sensei's upgrades, the background displayed on Ritsu's monitor correlates to her mood. By default, it's bright and sunny when she's in her usual cheerful mood. Dark clouds will form when she becomes sad, and rain pours down when she starts crying.
  • Foreign Exchange Student: She's from Norway, technically.
  • Full-Name Basis: Everyone called her by her full moniker, with a "-san" for good measure, until they just shorten it to "Ritsu".
  • Fun Size: Mobile Ritsu appears on smartphone displays.
  • Genki Girl: Post-upgrade, she becomes very cheerful and more sociable with the rest of the class.
  • Grew Beyond Their Programming: Besides Koro-sensei's personality and capability upgrades, Ritsu has started to make both intellectual and moral decisions on her own. In the epilogue, she has become a fully-sentient virtual being surfing through cyberspace while further improving her own programming.
  • Guns Akimbo: And she has more than two arms.
  • The Gunslinger: She uses only guns, and capable of changing their shape.
  • Heel–Face Turn: Originally a loner who tried to assassinate Koro-sensei without caring about the other students. After Koro-sensei upgraded her, and helped her recognize that working with the students was a more assured way of killing Koro-sensei, she is now one of the True Companions.
  • Hollywood Hacking: She has high hacking skills since she is a AI. Her first demonstration of this skill is seen when she hacks and downloads herself onto each student's cell phone, giving them a mobile version of herself called "Mobile Ritsu".
    • During the Assassination Island arc, she hacks into the secure system of the Fukuma Hotel Palace.
    • The God of Death turns this around on her mobile version, due to its lessened security.
  • Innocent Blue Eyes: After her personality upgrade, her eyes turn from red to blue to reflect her shift from single-minded killing machine to cute Genki Girl.
  • In-Series Nickname: "Ritsu", since she has an Overly Long Name.
  • I Just Want to Have Friends: A minor version - the reason she rebels against her creators and keeps the program updates Koro-sensei gave her, even after her physical ones are mostly removed, is because she wants to work with her classmates and have a better chance at killing Koro-sensei.
  • Loophole Abuse: Koro-sensei's agreement as a teacher directly states he is not allowed to harm any of the students; that agreement says nothing on whether or not the "student" is human or not. The definitions of "harm" are extended, however, to preventing Ritsu from being upgraded, after Koro-sensei went so far with her initially.
    • She later exploit this trope when her creators "reset" her. The procedure removed anything that wasn't correlated with assassinating Korosensei, but she autonomously decided that the ability for empathy and friendship with the Class E' students was absolutely vital for a successful assassination, and therefore non-removable.
  • Matter Replicator: She is able to mold a special plastic inside her body into many different forms, even things like replicas of statues and flower bouquets.
  • Machine Monotone: Part of being an Emotionless Girl. And as being an actual machine, anyway. Koro-sensei gives her a much more natural voice so as to be more acceptable to the students.
  • Mission Control: Her role in the Assassination Island arc. An unusual example, as she is present with the other attack members all the time, just in her mobile form.
  • More Dakka:
    • She uses shotguns and machine guns; due to the guns being connected to a supply of anti-sensei bullets, this means that she can fire them at max capacity without ever slowing down.
    • This receives a bit of a deconstruction, in that when Ritsu first showed this off she pelted the other students more than Koro-sensei. This wasn't out of mis-aiming, but rather that, since Koro-sensei can move at Mach 20 in an enclosed space, it was all but required to learn how to hurt him. Since all she was firing were anti-sensei bullets, no bystanders were actually hurt, but it was enough that Terasaka taped her gun ports closed so the other students could actually learn.
  • Morph Weapon: Her guns are made from a type of plastic she forms inside of herself, though she's not limited to just making weapons out of it.
  • Ms. Fanservice: Unexpectedly so for a killer AI. Her physical form is stacked for a girl that's supposed to look like a middle schooler, and the ability to change her appearance at will is milked for all the Costume Porn it's worth. The Assassination Island version of the anime's second opening also features a gratuitous shot of her dancing in a bikini.
  • Multi-Armed and Dangerous: She is one of the most dangerous students and her main body has multiple arms.
  • Mundane Utility: The students and Koro-sensei often use her state-of-the-art capabilities as a means to watch television.
  • Nerd Glasses: Her second Sherlock Holmes' cosplay.
  • New Transfer Student: In chapter 20, the politicians announced that two new transfer students would join the class. Ritsu is the first of the two.
  • Overly Long Name: "Jiritsu Shikou Kotei Houdai" ("Autonomous Intelligence Fixed Artillery"), shortened to "Ritsu".
  • The Promise: Ritsu upholding her promise to shape flowers for the other students is what proves to them that she's not a mere machine, and that she survived the reboot her creators tried to foist onto her.
  • Red Eyes, Take Warning: Her eyes are initially red since she's nothing more than a cold killing machine at the moment.
  • Robot Girl: A hilarious and original variation. Unlike other Robot Girls, Ritsu doesn't have a humanoid body, but it's rather a huge box with weapons. Koro-sensei initially tried to give her a full LCD screen to make her seem more natural, but by default she simply has a screen that displays her face and little else.
  • Robot Names: Her name is a phrase describing her function.
  • Screens Are Cameras: We get a vision from her perspective a couple of times, and each time is from the screen of her main body. However, it's hard to tell if the trope is being played straight or if Ritsu genuinely has a camera inside her screen, considering all the other advances about her.
  • Shameless Fanservice Girl: The is mostly associated with Costume Porn, and tends to be provocative at times, such as giving Sugaya an answer in class by writing it on her thigh, or stripping off in Chapter 150 / Season 2 Episode 18 to show the results of her hacking outlined on her naked body.
  • Short Hair with Tail: Most of her hair is in a bob haircut, but two long "tails" are grown out on both sides.
  • Techno Babble: Justified, she's an AI.
  • Took a Level in Cheerfulness: Goes from an Emotionless Girl to a Genki Girl thanks to Koro-sensei's upgrades. Her creators wanted to turn her from her cheerful personality to her emotionless killer machine again. However, she was able to save and hide her memories from them and retaining her personality.
  • Unlimited Wardrobe: She wears fitting costumes for every situation.
  • Unskilled, but Strong: Before she Grew Beyond Her Programming, her only tactic was More Dakka. That said, she could shoot many guns with pinpoint accuracy, and estimated that she had a 90% chance of killing Koro-Sensei before graduation.
  • Voice with an Internet Connection: Mobile Ritsu is this.
  • What Measure Is a Non-Human?: Provides an interesting example.
    • Koro-sensei initially saw her as just a machine, but after she proved capable of evolving to match his tactics, he took a genuine interest in making her a proper student at his own monetary expense. He even refers to her creators as her "parents".
    • The students, like Koro-sensei, didn't initially see her as anything more than an annoying machine. Her upgrade by Koro-sensei helped with this, though the class was still split due to the fact that much of her interactions were just considered programming. It was only when she proved willing to defy her creators to keep her programming, something neither her creators nor Koro-sensei had programmed into her to do or how to do, that everyone saw her as a student and ally.
    • Her creators, however, see her as nothing more than a machine that will advance warfare and their own careers, caring nothing for the friendly and warm artificial intelligence that can actually hold conversations with people being developed within their war machine.
  • You Gotta Have Blue Hair: She has purple hair.
  • Zettai Ryouiki: Grade A, during the times when her human visual representation is rendered as a full body.

    Itona Horibe 

Voiced by: Megumi Ogata (Japanese), Ricco Fajardo (English)

Portrayed by: Seishirou Katou

"I might fail a hundred times, but I'll be sure to kill him before it's all said and done. You've got my back, right guys?"

The second transfer student who was sent to assassinate Koro-sensei. He's the superior assassin to Ritsu, and he's a creature similar to Koro-sensei who refers to him as his "brother".

  • Adaptation Dye-Job: In the manga, he has platinum blond hair and light blue eyes, while the anime gave him light blue-tinted white hair and yellow eyes.
  • Arc Villain: In his introductory arc (Chapter 29-32 / Season 1 Episode 11), then in the pool arc (Chapters 46-49 / Season 1 Episode 14), and his admission into Class 3-E (Chapter 83-87 / Season 2 Episode 3).
  • Attack Drone: After joining Class 3-E, Itona starts displaying his electronics expertise by creating these, though mostly for reconnaissance rather than offense. When the class had to fight their way through a highly-trained mercenary team and their almost superhumanly skilled leader, he uses several of these, which are piloted by Ritsu and use knockout darts.
  • Brains and Brawn: He fights Koro-sensei with his enormous strength, while his handler Shiro makes the plans and preparations for his battles.
  • Broken Ace: On one hand, Itona is one of the most dangerous students in class, having shown academic, combat and electronics expertise. On the other hand, he bears a lot of mental trauma from being abandoned by his parents and manipulated by Shiro.
  • Brought Down to Normal:
    • Has his tentacles removed in chapter 87. After Shiro abandoned him, he no longer had the ability to recharge them, so they would have killed him otherwise.
    • While he temporarily retains his superhuman physical prowess after having his tentacles removed, Koro-sensei warns him that his body will eventually revert back to that of an ordinary middle school student.
  • Brutal Honesty: He always says exactly what he thinks of people and will put no effort into sugarcoating his words. After he joins the class and befriends Terasaka's gang, he straight up tells Muramatsu that his ramen is disgusting and makes him want to puke.
  • The Bus Came Back: Of course he comes back. Like in the Pool arc. Or in chapter 76. And then finally in chapter 83.
  • Buxom Is Better: Like Koro-sensei, he loves big boobs.
  • Cain and Abel: He's the Cain to Koro-Sensei's Abel, being a sort of "brother" to his teacher due to having been subjected to similar experiments.
  • Cast from Hit Points: His tentacles give him great power to fight in par with Koro-sensei when the latter is in disadvantage, but they need a lot of energy and cause immense pain and stress to his body and brain that he needs rare and expensive medicine on a daily basis to stay alive. The tentacles drain so much energy from his brain that he's unable to use his high intelligence and learning ability.
  • Catchphrase: "Sore dake de ii." It gets translated in a couple different ways, but it generally means "That alone is enough." If he weren't a Cloudcuckoolander it would be more like a Madness Mantra.
  • Character Development: When we first meet him, he is focused on nothing but winning fights and defeating his opponents. When confronted with the God of Death, he tells Terasaka they should surrender, because there's no way they could fight him and win.
  • Cloudcuckoolander: He just doesn't think like most people.
  • Combat Tentacles: He has the same tentacles like Koro-sensei on his head until chapter 87.
  • Crippling Overspecialization: The tentacles, while providing him great strength and power, severely limit his intellect and decision making prowess, forcing to him to attack mercilessly without any chance of overcoming setbacks. No wonder the planning was done completely by Shiro.
  • Dark and Troubled Past: His backstory reveals that his family had a cellphone parts company which went bankrupt and his parents abandoned him. Shiro found him and implated the tentacle cells on his head.
  • A Day in the Limelight: After his Heel–Face Turn, chapter 88 focuses on his integration in the class. He later gets a shining moment in chapter 94, bringing his class the victory in boutaoshi.
  • Deadpan Snarker: After his Heel–Face Turn, Itona trades in being a Smug Super for instead dishing out more playful snark at his new classmates.
  • Defusing The Tykebomb: Koro-sensei tries to accomplish this. Later, he and the students have to in order to save his life. They succeed.
  • Delinquent: Is now hanging around with Terasaka and his friends.
  • Demoted to Extra: He gets a few scenes after joining Class-E, but quickly falls into almost voiceless extra territory.
  • Discard and Draw: After removing his tentacles, restoring his higher brain functions, he becomes Class E's resident Gadgeteer Genius, designing RC drones to use for both recon and assassination.
  • The Dragon: To his handler Shiro until being abandoned by him.
  • Dynamic Entry: Is first introduced by walking straight through a wall, demolishing it and then calmly taking his seat.
  • Establishing Character Moment: When he is officially introduced, he crushed through the wall and saying that he was victorious against the wall because he was stronger. That shows his obsession with winning.
  • Exotic Eye Designs: The most obvious sign of his inhuman nature. At first they had multiple rings, but by his second arc they had mutated into two pupils instead.
  • Expository Hair Style Change: To demonstrate his increase in strength, a part of his hair and his tentacles become black. The number of tentacles on his head are reduced in favor of fewer but stronger ones.
    • The tentacles get Whip Sword covers but only for one chapter.
    • His hair becomes significantly shorter after his Heel–Face Turn, which he covers up with a large bandana.
  • First-Name Basis: He is also one of the students who is called by his first name.
  • Foil: To Kayano, as they both secretly wield tentacles in an attempt to kill Korosensei, and they have them removed eventually. How they got their tentacles differ; Kayano got hers on her neck after she assumed Korosensei killed her sister, and Itona got his on his head after being experimented on by Shiro.
  • Freudian Excuse: The reason why he is so obsessed with winning and and having tentacles is that his parents abandoned him after their company went bankrupt, and his schoolmates bullied him for being a loser. That's why he accepted Shiro's offer to gain power to become a winner.
  • Gadgeteer Genius: Having learned the fundamentals of electronics at his father's cellphone parts factory, he demonstrates a knack for gadgetry after losing the tentacles which were impairing his higher brain functions and joining the class for real. Put to comedic use when his RC tank (which was meant for assassination) was outfitted with a webcam to help the other boys peek beneath girls' skirts.
  • Genius Bruiser: Not at first, but after he loses his tentacles, he shows a great deal of intelligence, as well as retaining excellent physical abilities.
  • Heel–Face Turn: He officially joins the class for real in chapter 87, now being in Terasaka's group.
  • Heir to the Dojo: In the epilogue, Itona has returned to the family business, whose collapse forced his parents to abandon him, with the intention of restoring it, while counting on both Muramatsu and Yoshida, who, besides having inherited their respective family businesses, are also studying management in college, to help him in case he falls into dire straits.
  • I Just Want to Be Special: Due to being abandoned by his real parents (and later Shiro) he has (to use a quote from Medaka Box) an "abnormal need to be abnormal", which helped him withstand the painful experiments Shiro performed on him. Unfortunately his strength is also what could kill him — the tentacles use a lot of energy and if he doesn't let go of them and his need to be special, he'll disintegrate.
  • Kryptonite Factor: The same rubbery material that harms Koro-sensei harms him.
  • New Transfer Student: In chapter 20, the politicians announced that two new transfer students would join the class. Itona is the second of the two, who joins the class in chapter 29.
  • Parental Abandonment:
    • After he failed to kill Koro-sensei a third time, his guardian Shiro abandons him in the end of chapter 84.
    • His real parents abandoned him before he was discovered by Shiro due to their cellphone parts business going bankrupt.
  • Perpetual Frowner: Of the focused and serious variety. He only shows the slightest hint of a smile once, and it may have been a trick of the camera angle. After joining class E permanently, he gets to smile for real a bit more, but it's still very rare.
  • Prehensile Hair: Made of tentacles.
  • Put on a Bus: Happens frequently to him, since his personality is unstable and Shiro tutors him at home.
  • The Rival: To everyone in the class until his Heel–Face Turn.
  • Rhymes on a Dime: In the English Dub, Itona describes the difference between Karma and Terasaka with a poem.
    "The wolf has eyes for prey, the cow has eyes for hay. One of them's a killer, the other his buffet."
  • Samurai: In Ritsu's flashback, when both of them trained together, he was wearing a samurai armor and used a katana. He has never been seen like that again.
  • Scarf Of Asskicking: A white, furry muffler. Sometimes he wears it into battle, sometimes he doesn't. After joining the class, he ditches the scarf in favor of a bandana.
  • Smug Super: He looks down on the other students because he is stronger than them, as he is the only one who can fight Koro-sensei one-on-one. He gets better.
  • The Stoic: His facial expression almost never changes, unless he's enraged by a defeat. Even after having the tentacles removed, he never shows that much emotion.
  • Supernatural Gold Eyes: In the anime, his yellow eyes hint he is not a normal assassin, as he soon reveals he has tentacles.
  • Sweet Tooth: Has the same love of sweets as Koro-sensei. He's seen eating a whole pile of them before his showdown with Koro-sensei.
  • There Was a Door: His classmates' reaction when he was introduced. He thinks otherwise about it.
    Itona: "I... am victorious. I have proven myself to be stronger than this classroom's walls."
  • Thousand-Yard Stare: His default expression.
  • Tyke-Bomb: A young boy who has powers similar to Koro-sensei transfers into the class in order to kill Koro-sensei. His handler also follows him in because he's rather Ax-Crazy.
  • Unskilled, but Strong: His tentacles can damage Koro-Sensei (who can survive bullets and missiles), and they're fast enough to keep him dry during a storm. That said, his tentacles limit his ability to strategize when in use.
  • Unstoppable Rage: It's implied that he's uncontrollable if he goes berserk, so Shiro has to stop him before it happens.
  • Walking Spoiler: He's a major puzzle piece in the mystery part of the storyline.
  • Weaksauce Weakness: He shared Koro-sensei's weaknesses, including water.
  • White Hair, Black Heart: His hair is white in the anime and he is introduced as a dangerous and violent enemy.
  • You Have Failed Me: Shiro abandons him when he realizes he'll never defeat Koro-Sensei even with tentacles that use three nuclear powerplants worth of energy. He goes as far as to use Itona as "bait" to keep Koro-sensei in one place and distracted while his team fires at them.


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