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Assassins

     Lovro Brofski 
https://static.tvtropes.org/pmwiki/pub/images/29b865533dfad6500e65f89ce7281dff.jpg
"Relax for even one day, and your killing muscles atrophy. Unless you want to fail, wear something respectable!"

Voiced by: Takashi Matsuyama (Japanese, TV anime) and Kent Williams (English)

Irina's Russian mentor in the ways of the assassin and a handler of contracts for assassins around the world, as well as using his wealth of knowledge and experience to train the next generation of professional killers.


  • Badass Teacher: He taught Irina many of the things she knows about assassinations, and briefly even took Nagisa under his wing.
  • Chekhov's Gun: The "shock clap" technique he taught Nagisa saw little important use until his rematch with Takaoka.
  • Drill Sergeant Nasty: His introduction has him hanging Irina from the ceiling with a rope because he thinks she's gotten too lax. But with the students, his methods are much more moderated, though still no less intimidating to Irina, after he caught her slacking off again while the students are training for their summer assassination.
    Sugaya: "Whaddya know. Someone even Bitch-sensei doesn't dare mouth off to."
    Maehara: "Can't say 'I blame her', man. He's as scary as they come."
  • Hitman with a Heart: He seems to care for the assassins he has trained and them to him as well. After he was shown to be alive after apparently being killed by the "Reaper", Karasuma asked him to see Irina, who has been worried about him.
  • Husky Russkie: Lovro is Russian, and he's one of the most seriously tough characters in the series. For the English dub, Kent Williams even gives him a thick accent.
  • Not Quite Dead: In Chapter 76, he was seemingly killed by the God of Death. He was just sent in a coma and has recovered.
  • Red Baron: The "Hitman Dealer".
  • Retired Badass: He used to be a skilled assassin, but age has taken its toll. Still manages to survive an attack by the "Reaper", though, though so he's still pretty tough.

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     "Red Eye" 
https://static.tvtropes.org/pmwiki/pub/images/e53fb47ee13372bee7615c9aa19332d3.jpg

Voiced by: Shin-ichiro Miki (Japanese, event anime), Taiten Kusunoki (Japanese, TV anime), Robert McCollum (English) and Tsuyoshi Abe (live-action)

A sniper obsessed with the color red. He was one of the hitmen hired by the government to assassinate Koro-sensei in Kyoto. After he failed, Koro-sensei, who already noticed, thanked to him for his several attempts, because Class 3-E could learn from it, and Red Eye finally gave up.



     Smog 
https://static.tvtropes.org/pmwiki/pub/images/462942d75671fefb97dc9b8651b13659.jpg

Voiced by: Atsushi Imaruoka (Japanese, TV anime) and Tyson Rinehart (English)

An assassin with an obsession for self-made poison who is hired by Takaoka in the Assassination Island arc.


  • Chekhov's Gunman: He first appears as a waiter in Chapter 58. Fuwa immediately recognizes him in Chapter 63 as the man who poisoned the eleven classmates.
  • Code Name: "Smog". His real name is unknown.
  • Even Evil Has Standards: Before giving the poison to Takaoka, he, Gastro and Grip had some discussion regarding the situation and decides that killing a whole class of innocent teenagers, as Takaoka revealed he had no intentions of actually handing over the antidote, doesn't maintain their reputation. Thus Smog and his associates swapped the poison with a non-lethal food poisoning bug that would eventually wear off, while still giving the victims enough pain to fool Takaoka into thinking that they complied. He even gives the students his own home-made medicine for their sick classmates after the Boss Battle.
  • Evil Genius: The guy who relies on poison.
  • Fat Bastard: Subverted, as even he is not evil enough to kill a bunch of children.
  • Gonk
  • Master Poisoner: Obsessed with a quality of his poisons, makes all of them himself in his own laboratory and can tailor their effects for variety of situations, like creating a synthetic virus, that makes target appear seriously sick, but becomes inactive after a few hours, leaving only minor damage.
  • Poisonous Person: He uses poison gas and other poisons. Also during the School Festival Arc he mentions that his noodles would be better with some poison, suggesting he eats it too.
  • Punch-Clock Villain: He, Gastro and Grip held none of Takaoka's sadism after all.

     Grip 
https://static.tvtropes.org/pmwiki/pub/images/e45b91e2323cf45f39ef8d6d75475d77.jpg

Voiced by: Katsuki Murase (Japanese, TV anime) and Christopher Sabat (English)

An assassin hired by Takaoka in the Assassination Island arc.


  • Blood Knight: He wants to test his enormous strength in battles. In the world of assassination, it's almost impossible to have a real battle.
  • The Brute: The guy with superhuman strength, but he's also a Combat Pragmatist.
  • Charles Atlas Superpower: His hands can crush skulls and glass walls with ease.
  • Code Name: "Grip". His real name is unknown.
  • Combat Pragmatist: He still uses poison and knives, since he's a professional assassin.
  • Crossdresser: He likes to accessorize with some makeup and a string of pearls; nobody seems to notice. His true sexuality is unknown.
  • Even Evil Has Standards: Like Smog and Gastro, even he had none of Takaoka's sadism and decided that assassinating middle-school kids wasn't worth the bounty for killing Koro-sensei, so he instead opts for direct combat with Karma.
  • Funny Foreigner: His Verbal Tic and the reason for it makes him rather eccentric.
  • Good Old Fisticuffs: His forte. He mentions that this skill as an primary assassination weapon gives assassins like him an advantage on missions that require infiltration (As he will never get caught during a body search). Doesn't stop him from using any weapons when time is needed to win
  • Graceful Loser: Took his loss to Karma surprisingly well, since even he admitted that Karma forcefully used horseradish and wasabi sauce into his nose.
  • Punch-Clock Villain: He, Gastro and Smog held none of Takaoka's sadism.
  • Verbal Tic: He ends most of his sentences with "-nu" to give them a Samurai's tone, because he thinks it would be cool. In the English translation, it's rendered as "is it not?" and similar phrases.

     Gastro 
https://static.tvtropes.org/pmwiki/pub/images/d4027d7081e809a3da767ba69f43900d.jpg

Voiced by: Takehito Koyasu (Japanese, TV anime) and Mike McFarland (English)

A mercenary from a military who has an obsession of "eating"/licking/tasting guns, hired by Takaoka in the Assassination Island arc.


  • Anime Hair
  • Artistic License – Gun Safety: This guy has a gun in his mouth for almost the entire time. He claims that he won't shoot himself, though.
  • Bunny-Ears Lawyer: Say what you want about the Oral Fixation with his gun; at the end of the day, it took the whole 15 student-team, meticulously coordinated by Koro-sensei, to bring him down.
  • Code Name: "Gastro". His real name is unknown.
  • The Dragon: To Takaoka.
  • Even Evil Has Standards: As leader of Takaoka's hitmem, he brought Smog and Grip over to discuss their situation and concluded that killing a whole middle-school class would hurt their reputation, a conclusion proven right when Takaoka reveals he has no intention of giving the antidote to students.
  • Fish Eyes: His eyes usually face away from each other. They probably enhance his shooting skills.
  • The Gunslinger: He has several guns.
  • Improbable Aiming Skills: Can fire a bullet between the space between the seats of a concert hall with ease. He's also very skilled at making headshots.
  • Licking the Blade: Parodied with his gun - he constantly licks it, bites it, and holds it in his mouth, and even uses it as an eating utensil.
  • Oral Fixation: With guns!
  • Punch-Clock Villain: He, Smog and Grip held none of Takaoka's sadism.
  • Reckless Gun Usage: He is obsessed with his guns. Where he crosses this line is that he even eats his food using his guns putting the gun barrel into his mouth.
  • Super Senses: He has very good ears, as he is able to find out the number of students (+ Karasuma) and how roughly old they are by just hearing their breaths. He is also able to hear out the stolen guns they use, and considering his Improbable Aiming Skills, he must have good eyes, too.
  • Willfully Weak: Despite his brutal strength, he refuses to fight Class 3-E at full strength.
  • Would Hurt a Child: Aimed for the kill during his battle with Class 3-E. Sugaya's decoy saved Chiba from receiving a bullet between his eyes.

     "Reaper" 

https://static.tvtropes.org/pmwiki/pub/images/5911b43c_9aac_4ae4_b433_77f8abc3523d.jpeg
Click here to see his real face 

"No human being is capable of taking down the Reaper. Inversely, human beings are the Reaper's preferred prey."

Voiced by: Nobunaga Shimazaki (Japanese, TV anime) and Ian Sinclair (English)

Said to be the best assassin in the world. Enigmatic to the point where even other assassins know little about him. He remains a mythic figure for much of the manga, but eventually starts targeting other hitmen with the intention of working his way up to Class 3-E and Koro-sensei.


  • The Ace: He's the undisputed master of every possible skill relating to assassination, including several that most assassins don't even consider.
  • Achilles' Heel: Hilariously, it's his testicles.
  • Adapted Out: He was left out of the live action movie. Instead, Shiro takes the role of Koro-sensei 2.0.
  • Alas, Poor Villain: After defeating him for the last time, Koro-sensei apologizes to him for not raising him properly, which ultimately led to his betrayal, and comforts him in his final moments by promising to him that, should they meet again in another life, he would Raise Him Right This Time.
  • Arc Villain: From Chapter 98-110.
  • Badass Longcoat: Fitting for someone whose Japanese name "Shinigami" means "God of Death", since he doesn't wear a robe.
  • Bastard Understudy: He learned everything he knows about assassination arts from his predecessor, then betrayed him to the authorities to claim the title for himself.
  • Bishōnen: When he was working as a flower salesman, he was this. Even keeps this face as the God of Death. When it gets removed however...
  • Blood Knight: He's overjoyed that the students managed to oppose him.
  • Body Horror: Taken Up to Eleven when Shiro infuses him with antimatter cells and starts calling him "number two."
  • Catchphrase: "Do not fear (...)."
  • Charles Atlas Superpower: The best hitman in the world for sure, but this guy's abilities definitely push the limit of what is humanly possible. At one point he gives Okajima an uppercut that bounces the poor guy off the ceiling and rebounding him back down to the floor... hard. Later, he's able to shoot Koro-sensei's tentacles with pinpoint accuracy and Guns Akimbo by reasoning that Koro-sensei can't reach his full Mach-20 speed right off the bat. However, Koro-sensei's starting speed is still somewhere around 600 kph. At one point, he even scored a headshot on a guy riding on a Shinkansen train... while he was on another train heading the opposite direction.
  • Code Name: "Reaper". His real name is unknown.
  • Curb-Stomp Battle: Justified. He's the world best assassin. Assassins do not fight. They kill their targets very quickly.
  • Deceptive Disciple: Chapter 134 shows this is how he took the title to begin with. And it's from the man who would become Koro-sensei.
  • Dissonant Serenity: In the same vein as Nagisa, but to an even higher degree. Even while he's threatening to kill the class and Irina, the class can't help but to feel perfectly at ease.
  • Disproportionate Retribution: His statement before (apparently) killing Lovro seems to indicate that he did it merely because the latter talked about him as someone to be feared.
    "From the moment you are born I am by your side, always. Do not put fear in the name, the 'Reaper'."
  • The Dragon: Becomes this to Shiro in the final arc.
  • Dragon Their Feet: After Shiro is defeated, he continues to fight with Koro-sensei until he too is forced into the anti-sensei barrier.
  • Establishing Character Moment: Fitting to his title, he suddenly appears out of nowhere and (apparently) kills Lovro.
  • Evil Counterpart: He has many of the same abilities that Nagisa does. He can hide his killing intent and appear completely harmless, and even uses the same clapping move when they encounter each other. There’s also the fact that they were trained by Koro-sensei.
  • Evil Is Petty: He betrayed his master to the authorities out of spite for not getting enough attention.
  • Expy:
    • Possibly of the Rurouni Kenshin character Hanya, given how the "Reaper" uses the same trick of cutting off and deforming his own face in order to be more effective at disguise.
    • The way the Reaper cuts off his own face and is revealed to be a skull is very similar to the Captain America villain Red Skull.
  • Face Death with Dignity: Dies smiling after finally receiving acknowledgement from Koro-sensei, his former mentor. This is in sharp contrast to Yanagisawa, who screamed and flailed helplessly as he got blown away into an anti-tentacle barrier.
  • Facial Horror: Whenever his killing intent leaks through, his face is depicted as either a skull or something horribly mutated. It's later revealed he cut off his own face.
  • Faux Affably Evil: He acts nice, but his intentions are anything than that.
  • Finger Firearms: What it actually is. While normally such low caliber ammo has low lethality, his Improbable Aiming Skills more than makes up for it.
  • Finger Gun: Does this when he (apparently) kills Lovro.
  • Freudian Excuse: Double-subverted. He claimed to share a similar tragic backstory with Irina to manipulate her into betraying Class 3-E, but later admits that he grew up in a rich family without any wants. He's an assassin because he wants to be. Then played straight with his real backstory, where he never felt like anything but a tool to his master, now Koro-sensei, which led him to betray him.
    • Whose backstory was his fake tragic backstory based on? His mentor and the original "Reaper", who would eventually be known as Koro-sensei.
  • The Grim Reaper: Usually possesses this symbolism, especially in Chapter 98.
  • Groin Attack: Karasuma finds an opening for a second and punches his groin. Then he finishes him off.
  • Hero Killer: Since his second appearance, he has (apparently) killed secondary characters. Then, in the finale, he mortally impales Kayano, forcing Koro-sensei to tap into his ultimate form.
  • Instant Soprano: In the anime, after Karasuma kicks him in the nuts.
  • Karmic Death: He meets his end at the hands of Koro-sensei, the predecessor he betrayed, who stabs him in the heart with a anti-tentacle knife, then, after apologizing to him for being a poor teacher, forces him into an anti-tentacle barrier.
  • Knight of Cerebus: By the time he appears, the series takes a far darker turn, evidenced by him apparently killing Lovro and "Red Eye", as well as the revelation of his true connection to Koro-sensei.
  • Legacy Character: Chapters 133-134 reveal he is the second person to hold the name "Reaper." The original was the man who would become Koro-Sensei, who he betrayed.
  • Living Shadow: What he appears to be.
  • Master of Disguise: His actual appearance is very plain. Coupled with his enigmatic reputation and talent at hiding his true nature, he's able to effortlessly infiltrate just about anywhere. Except that his actual appearance is a disguise as well. The reason he is this trope is because he ripped of his own skin from his face.
  • More Than Mind Control: He subverted Irina's loyalty so that she turned against Koro-sensei, Class 3-E and Karasuma.
  • Names to Run Away from Really Fast: Yep, his name is "Reaper", alright. There's also "God of Death."
  • Near-Villain Victory: He nearly succeeds in killing all of Class 3-E and their three teachers had both Koro-sensei and Karasuma not been so inhuman and unpredictable. He tries again in the final arc, and Shiro's ego-tripping is the only reason he failed.
  • Nightmare Face: His real face is close enough to a Skull for a Head.
  • Nightmare Fetishist: The entire reason he's a hitman. When he was a child, he saw his (abusive) father killed by a hitman (the original "Reaper", now known as Koro-sensei). The movements of the hitman were so beautiful that he decided then and there to become one too.
  • Oral Fixation: With a chocolate bar.
  • Power at a Price: Shiro upgrades him into a being that's twice as fast and strong as Koro-sensei, but shortened his remaining life span to just three months.
  • A Pupil of Mine, Until He Turned to Evil: It has been revealed that he was an apprentice to Koro-sensei, the original God Of Death. After so much neglect from the teacher he admired so much, he betrayed Koro-sensei by abandoning him at the lab they were infiltrating to be experimented on. No coming back from that.
  • Revenge Before Reason: He wants to get back at Koro-sensei and Class 3-E because they wouldn't let him kill them on his previous attempt. He is even willing to undergo a Deadly Upgrade that shortens his remaining life-span to just three months to do so.
  • Serial-Killer Killer: He has been targeting assassins so far.
  • Shrouded in Myth: No one knows who he is, or even what he looks like, and yet he's the undisputed number one in assassination according to Lovro.
  • Sinister Scythe: "Red Eye" describes his weapon as an "invisible scythe". It is a metaphor for a gun hidden in his index finger.
  • Slasher Smile: Fitting for someone named "Reaper".
  • Sweet Tooth: He eats a chocolate bar when he apparently observe Class 3-E (or Lovro and later while nearly killing Lovro.
  • Unwitting Instigator of Doom: While betraying his master to the government was certainly his intention, this caused pretty much everything that happened in the series: his master's transformation into a world-destroying tentacle monster known as Koro-sensei.
  • Trademark Favorite Food: During some of his appearances, he's eating a chocolate bar.
  • "Well Done, Son!" Guy: He wanted his master to acknowledge him and treat him as a student instead of a tool.
  • World's Best Warrior: Well, best assassin.
  • Would Hurt a Child: At first, he is only trying to harm Class 3-E a little bit in case of taking them hostage. But when they excite him too much, it gets worse. He also tries to drown them to kill Koro-sensei in a cage. He then takes it Up to Eleven in the final arc by attacking Class 3-E to keep Koro-sensei from dodging and then mortally impaling Kayano (though she survives after Koro-sensei's last-minute medical operation).
  • Would Hit a Girl: He takes Irina hostage and, later, he breaks some of Kayano's ribs after knocking out Yoshida, Muramatsu and Kimura (the cracking sound is actually just the armor). Later, he tries to kill Irina while she's still on his side, so he can get rid of Karasuma.
  • You Cannot Grasp the True Form: He's depicted as this in-panel; his bottomless killing intent combined with his skill at masking it confuses and disorients their targets, because it's impossible to see his true nature. As a result, once he reveals his true colors, he's depicted as either a monstrous conglomeration of predatory plants and insects or a Living Shadow. That said, a combatant of equal skill could see his true form. Until the final arc, where he can go from zero to Mach 40 in an instant, so it's hard to actually see his true form.

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Others

     Shiro 
https://static.tvtropes.org/pmwiki/pub/images/9871b7246f3ed5e1b6e135e4110c1c53.jpg

Voiced by: Ryota Takeuchi as Shiro / Mitsuaki Madono as Yanagisawa (Japanese, TV anime), J. Michael Tatum (English) and Hiroki Narimiya (live-action)

A mysterious man in a white robe and a hood. He is Itona's guardian, handler and home tutor and acts as his father. He knows a lot of Koro-sensei's weaknesses.


  • Arranged Marriage: His and Aguri's parents arranged a pity-marriage between them.
  • Badass Long Robe: His robe is made of anti-sensei materials.
  • Batman Gambit: He knows how Koro-sensei would act and he calculates his personality to prepare Itona's battles against him.
  • Big Bad: Not just of the non-school side, but of the entire series. He is pretty much responsible for the overarching crisis of the story, as his experiments have not only turned Koro-sensei into what he is today, but made the Moon explode into a crescent, as well as killed Aguri while she was trying to stop Koro-sensei's rampage.
  • Big "NO!": In the anime, before being killed by Koro-sensei.
  • Bitch in Sheep's Clothing: In his first appearance, he introduces himself to the class with some magic tricks, is seen reading a manga at one point, and generally chuckles a lot and speaks very politely to everyone. He quickly drops the act as Koro-sensei and Class 3-E keep finding ways to foil his attempts, although flashbacks show that he used this same charisma to win over Aguri's parents.
  • Body Horror: He injects himself with tentacle cells in order to help the "Reaper" kill Koro-sensei.
  • Brains and Brawn: He makes the plan and preparations for Itona's battles. Later, Kayano becomes the brawn, and even later the "Reaper".
  • Broken Ace: He was a famous biologist, heir to a wealthy family, and the head of the World Research Foundation. He's also a horrible fiancé, utterly manipulative, and incapable of recognising his own flaws.
  • Composite Character: In the live action film series he is not only the live action incarnation of himself but also the second Reaper being given his "Korosensei II" form
  • Control Freak: This guy revels in controlling others, from his fiancee Aguri, to the original "Reaper" (later Koro-sensei), to Itona in the present, and utterly hates those that don't go along with what he says.
  • The Corrupter: He took advantage of Itona's psychological trauma to turn him into his personal Tyke-Bomb in his vendetta against Koro-sensei. He also nearly made Terasaka kill his classmates with a bomb meant for Koro-sensei (which ended up serving as his catalyst for Character Development), and secretly tried to encourage Kayano's misguided vendetta.
  • Crazy-Prepared: He knows a lot of Koro-sensei's weaknesses, and he puts a lot of efforts and preparation for Itona's battles against him. From the events that happened in Chapter 128, it is possible that Kayano is the "weapon" he prepared, which was foreshadowed in Chapter 88.
  • Death by Adaptation: The anime leaves out his epilogue segment showing him paralyzed and disgraced, leaving the impression that he was Killed Off for Real by the anti-tentacle barrier after being blown away by Koro-sensei's Emotion Bomb during the final battle.
  • Death Cry Echo: It happens to him in Chapter 174 and it is just so gratifying.
  • Disposable Fiancé: To Aguri Yukimura. They were engaged only because of an agreement between their parents and he treated her like a slave. It's no surprise she ended up developing feelings for his human test subject, the original "Reaper" (later Koro-sensei), who was genuinely kind to her.
  • Domestic Abuse: Towards his fiancee Aguri.
  • Electronic Eye: When he removes his mask, we see that one of his eye is replaced with a mechanical one.
  • Evil Genius: The reason why Itona's battles against Koro-sensei are so difficult is because of Shiro's calculations.
  • Eye Scream: Lost his left eye when trying to stop the then-transforming Koro-sensei from trashing his research facility.
  • Fatal Flaw: Two times out of three, his plans directly fail because he forgot to take Class 3-E into account. Of course, they would probably have failed regardless.
  • Fate Worse than Death: In the manga epilogue, it is revealed that he somehow survived being blown away into the anti-tentacle barrier, but the damage to his tentacle-empowered body was so severe he was rendered a vegetable. Not only was he denied the pleasure of offing Koro-sensei (the bittersweet honor went to his students), but, as if to add more salt into the wound, the government finally shut down his lifelong work on antimatter, deeming it highly impractical even for military usage, leaving him a husk of himself stuck in a hospital bed that Nagisa can only presume that he reflects on his wrongdoing and hopefully put his genius to better use. If he recovers at all. Worse, being a Control Freak unable to control anything, including his own body, has to really suck. He may want to die now.
  • Final Boss: Together with the second "Reaper", though he is the first to be defeated.
    • Fittingly, the episode where he is finally fought in the anime is titled "Final Boss Time".
    • The live action incarnation plays it much straight due to being a Composite Character with the second Reaper.
  • Glowing Eyes of Doom: Because we see never his face under his hood.
  • Hate Sink: Far more than Tanaka and Takada, who were at least comically pathetic in their attempts at bullying, Asano Sr., who was a Tragic Villain who not only used to be a good teacher before being driven insane by the bullying-related suicide of one of his favorite students, but also ultimately found redemption, the Reaper, whose existence served as a tragic reminder of Koro-sensei's past failures as a teacher (for which he atoned with Class 3-E), or even Takaoka, himself another nasty piece of work, Shirou is not only devoid of any redeeming or sympathetic qualities, but, as [[spoiler:Yanagisawa, responsible for much of the crisis facing the world throughout the series, with his work on antimatter turning the first Reaper, Koro-sensei, into an unwilling time bomb and blowing up 70% of the Moon.
  • Hoist by His Own Petard: He injected himself with tentacle cells to take his revenge on Koro-Sensei. The same cells destroyed most of his body in the end after he gets blown away into an anti-tentacle barrier.
  • In the Hood: Until chapter 133.
  • Ironic Hell: For a man who reveled in manipulating people, Yanagisawa spends the epilogue with both his body paralyzed and his reputation tarnished beyond repair.
  • It's All About Me: Thinks everything in the world revolves around him, or rightfully should, and gets very, very violent when it doesn't. To the point of Hair-Trigger Temper.
  • It's Personal: Chapter 84 reveals that he has a personal hatred for Koro-sensei. He doesn't want just to kill him, he wants to see Koro-sensei suffer as much as possible at the same time. The flashback reveals why as Koro-sensei cost him an eye and his research facility.
  • Jerkass: He's arrogant, manipulative and abusive. He also treated his lab assistants and his arranged fiancee like crap.
  • Karma Houdini Warranty: Both Koro-sensei and his own laboratory took the blame for destroying the Moon, so Yanagisawa was able to go scot-free and continue his experiments. Ultimately his luck ran out in the finale, after the government canned the project, with him unable to do anything about it now that he's left a vegetable.
  • Laser-Guided Karma:
    • He used an antimatter weapon on Koro-sensei, getting his fiance killed as collateral damage, and now, in the final arc, he is caught by Koro-sensei's energy attack against the second "Reaper" as collateral damage and blasted into the anti-tentacle field while infused with tentacles and gets paralyzed.
    • He judges people based on their utility to his plans, and is particularly cruel to those he deems "useless". Then he becomes "useless" after not only was he left paralyzed, but his experiments have been finally shut down by the government.
  • Laughing Mad: In the anime, when the "Reaper" impales Kayano.
  • Light Is Not Good: He is completely clad in white, that's why he calls himself "Shiro". Well, technically, he tries to save the world, but he has an antagonistic role and his methods are extreme.
  • Mad Scientist: It was his experiments that turned Koro-sensei into what he is now and that he blew up the moon with a lab rat.
  • The Man Behind the Man: He is the real entity responsible of much of the bad things that has happened in the story. His antimatter research destroyed the Moon, turned the original "Reaper" into the monstrous Koro-sensei, got Aguri was killed by an antimatter container, and manipulated Terasaka (temporarily), Itona and even Kayano.
  • Manipulative Bastard: He manipulates Terasaka to help him and Itona against Koro-sensei. And he lies to him about the real plan to guarantee that he would help them.
  • Meaningful Name: He calls himself Shiro, which means "white" in Japanese and he wears white robes. His real name is Kotaro Yanagisawa.
  • Never My Fault: He honestly believes that Koro-sensei is directly responsible for the destruction of 70% of the moon, the death of Aguri, the destruction of his research facility, and the loss of his left eye, when in reality, each and every one of those things are a direct, and completely documented, result of his own actions.
  • Not Afraid to Die: He claims this when Kayano calls him out for staying on the sidelines while everyone else gets hurt. He then illustrates his point by injecting his cells with tentacles to join the battle. Ultimately though, he's proven wrong when while hurtling towards the anti-sensei laser barrier, his thoughts turn to how he can try to get out of the situation before entering denial.
  • Not So Stoic: He has a few comedic moments and he has a bit sense of humor.
  • Oh, Crap!: When he realises that he's about to go flying into the anti-tentacle barrier, his composure disappears altogether and he starts screaming in terror.
  • Overarching Villain: For a Big Bad, Shiro's appearances are fairly infrequent but him being responsible for Koro-sensei's anti-matter cells makes him the antagonist behind the series' Myth Arc.
  • Parental Abandonment: Shiro abandons Itona at the end of Chapter 84 after the latter failed to kill Koro-sensei for the third time.
  • Parental Substitute: He is Itona's guardian and acts as a sort of father figure for him until he abandons him.
  • Precision F-Strike: The English dub of the anime gives him one when he realises he's about to get launched into the anti-tentacle barrier.
    "Shit!! No! NO! THE BARRIER LIQUEFIES TENTACLES!!"
  • Revenge Before Reason: Is fixated on killing and brutalizing Koro-sensei for "stealing everything in his life." When most, if not all, of his misfortune are the direct result of his own actions. What's worse, is that he's willing to undergo a Deadly Upgrade to carry out his revenge, even if he dies in the process.
  • The Sociopath: Shiro only cares about himself, doing research for recognition and puts zero value on anyone who might be harmed by his experiments. He recklessly plays with anti-matter cells which results in the destruction of the moon, as well as turning Koro-sensei into a time bomb that will take the world out with him. After realizing the impact of what he's done, he shows no remorse and is only irritated by the impact it has on him. He also treats his fiancee like shit and doesn't even bat an eye when she's killed. He even tells her that if not for her father funding his research, he would happily have used her as his test subject instead of the "Reaper".
  • Too Dumb to Live: Gives powers to completely destroy the world to not one but two assassins that are referred to as the "Reaper", although it's strongly implied the UN ordered him to do it for the second.
  • Villains Want Mercy: Was screaming and begging to be rescued at the end of Chapter 174, then called "Number Two" worthless when he was unable.
  • Villain with Good Publicity: One of the reasons he was able to go unpunished for so long until the epilogue was because his intelligence was highly sought, and he has been manipulating the government into letting him advise them on how to take out Koro-sensei.

     Akira Takaoka 
https://static.tvtropes.org/pmwiki/pub/images/0c1640ecc31161f9825a5586c41f217e.jpg

Voiced by: Kenta Miyake (Japanese, TV anime), Justin Cook (English) and Masanobu Takashima (live-action)

A member of the Japanese Ministry of Defense's Special Services Division, assigned to push the training of Class 3-E and replace Karasuma as their P.E. teacher. He introduces himself as a easygoing father-like figure, but it quickly becomes apparent that he's actually a sadistic drill sergeant who has no problems with subjecting children to violent and unreasonable training regimens for his own benefit.


  • Abusive Dad: He acts as an abusive father figure to most of the people he trains. Just imagine how horrific it would be if he had kids of his own.
  • Anything but That!: After losing to Nagisa for the second time, he is reduced into screaming for his life once he realizes that the latter is about to give him the same sweet smile he flashed during their first duel.
  • Arch-Enemy: Develops an intense hatred towards Nagisa after he humiliated him in his introduction arc. The feeling becomes mutual when Takaoka destroys the antidote Nagisa needed to save his friends, even though he had already complied to his demands.
  • Arc Villain: In his introduction arc and in the Assassination Island arc. Unlike Terasaka, Itona and Kayano, he was not related to Shiro.
  • Ax-Crazy: This guy really enjoys beating his disciples into a bloody pulp, regardless of their age. Not to mention poisoning Class 3-E and destroying the antidote.
  • Bait the Dog: He is introduced as a fun-loving paternal guy. Is actually a sadist.
  • Batman Gambit: To lull Class 3-E into thinking he's a decent guy, he promises to leave if a student can land a single knife-hit on him in a one-on-one match. The catch? He expects none of them to be mentally prepared to use a deadly weapon against an actual human, so he demands that the challenger fight using a sharpened combat knife. The hesitation of using the knife, on top of the fact that no student is even skilled enough to hit him with an anti-sensei knife, will turn the match into a sure-win situation for himself. This is why Takaoka is completely thrown off guard when Nagisa, one of the physically weakest students of the class, decides not to put up a "traditional" fight and instead smiles as he casually walks over to him. Then he aims straight for his neck without any hesitation whatsoever. Takaoka doesn't take it well once the students celebrate Nagisa's win.
  • Big Eater: He claimed that it was the reason he's a bit rounder than others.
  • Big Fun: He portrays himself as this with self-depreciating humour, a sunny disposition, a happy smile and a generally avuncular approach to things (with a bag of goodies)... Although, this is what he's hiding as his true self.
  • Bitch in Sheep's Clothing: He's so quick to listen to your problems and to sympathise... a little too quick.
  • The Bus Came Back: Guess who is the boss that poisoned most of Class 3-E on the island?
  • The Coats Are Off: He and Nagisa throw their coats off before their final fight.
  • Duel to the Death: He challenges Nagisa to a knife duel in the climax of the Assassination Island arc, right when he blows up the antidote.
  • Disproportionate Retribution: Basically tried to kill off every student in Class 3-E with accelerated cancer simply because Nagisa beat him at his own game (even after rigging the match to his advantage), resulting in his co-workers ridiculing him due to his Humiliation Conga.
  • Dissonant Serenity: Takaoka's always grinning and sticking out his tongue, whether he's handing out pastries, revealing his ridiculous training schedule, or violently attacking contrary students, until he challenges Class 3-E.
  • Drill Sergeant Nasty: Has a "9-sticks-to-one-carrot" philosophy, is more like a dictator than an officer, and "accidentally" leaves a picture of the soldiers he's tortured in front of Karasuma. And he's always smiling.
  • Driven by Envy: He's was incredibly jealous of Karasuma, who was the most talented member of their unit in the JSDF and quickly rose above him. He hopes that if he turns Class 3-E into the heroes (even if it means killing some students in the process) who will defeat Koro-sensei, then he'll also become a hero and be finally able to order Karasuma around.
  • The End Justifies The Means: Takaoka's extremely harsh (if not downright impossible) training schedule will be worth it if just one student survives (though he couldn't care less about his students' lives, even going as far as sacrificing one to make the rest follow his orders) and succeeds in killing Koro-sensei because Takaoka will become famous for training the assassin and then Karasuma will be forced to acknowledge his superiority!
  • Evil Is Bigger: He's very big.
  • Evil Is Petty: His main reason for taking over Class E's physical instruction and brutalizing them? He's jealous that Karasuma has always been better than him and wants to get promoted over Karasuma. For that reason, he's willing to use any methods to raise the students into elite soldiers... even if it means killing most of them along the way.
  • Expository Hair Style Change: After losing to Nagisa and being fired by Asano Sr., he either uses hair gel or his hair is just messy.
  • The Faceless: At the time before he was revealed to be the Big Bad of the Assassination Island arc, his face was never shown. Because it would be a spoiler.
  • Fat Bastard: He seems nice at first, but he really is violent and sadistic in his "teaching" methods. Somewhat subverted in his second appearance, as he's lost a lot of weight and looks much more trim. Yet, he's a hundred times the bastard he was before, not to mention quite a bit more... unhinged.
  • A Father to His Men: He even said that the students would be like his own children, just like his previous trainees. Yeah, as if! He would make your life a living hell if you didn't listen to your "father".
  • Faux Affably Evil: He pretends to be a nice "father" to his disciples, only to reveal himself as a crazy, vicious psychopath.
  • Final Boss: Of the Assassination Island arc.
  • Go Mad from the Revelation: Everything about his duel with Nagisa, from the disarming smile, the knife that almost killed him, and the resulting humiliation aftermatch made him vengeful and psychotic. After Nagisa wins their second duel, he shows Takaoka the same smile before zapping him unconscious. It's very likely that this wiped away whatever was left of his sanity.
  • Good Scars, Evil Scars: He scratches his skin a lot after losing to Nagisa, after he overheard his colleagues mocking him for his defeat after he returns to HQ.
  • Hijacked by Ganon: In the Assassination Island arc.
  • Inelegant Blubbering: In the anime, when Nagisa actually doesn't hesitate from holding a knife and scares him into thinking that he's about to die, his face ends up coated in streams of tears, snot and drool.
  • Knight of Cerebus: When he shows his true nature, the story shifts from a fun, uplifting comedy into the darker, more serious themes of assassination. This goes double for his involvement during Class 3-E's island vacation.
  • Laughing Mad: He breaks into a fit of hysterical laughter when he blows up the antidote to cure the students, further pissing off Nagisa.
  • Mad Bomber: Most notably during the Assassination Island arc, when he blows up the antidote used to cure the students while laughing like a lunatic.
  • No-Holds-Barred Beatdown: He gives Nagisa a brief but brutal one during their final fight. It doesn't put him down, however, and he ends up at the receiving end of a swift near-kill.
  • Not So Stoic: Takaoka's Dissonant Serenity is shattered in Chapter 41 courtesy of Nagisa. His grinning gives way to shock, then mind-numbing fear, and finally frothing rage.
  • Obviously Evil: When he's introduced, there are some hints that he's not as nice as he appears.
  • Oh, Crap!: During his second defeat when he realizes that Nagisa is going to smile at him.
  • One Steve Limit: With Kataoka.
  • Sadist Teacher: He's more akin to a drill sergeant than a teacher, instituting a ten-period class schedule, most of which consists entirely of training, and isn't above smacking any disagreeable student (girls included) around.
  • Sore Loser: He doesn't take his defeat by Nagisa well. He's convinced that Nagisa cheated during their first duel by using an "unskillful, cowardly sneak attack", demands a rematch to kill him and refuses to listen to Nagisa's refusal and attacks him. Twice. Both attempts fail spectacularly.
  • Stepford Smiler: Is this, together with his dissonant serenity. Irina sees through this immediately, noting that his cheerful personality "seems kinda forced."
  • Tongue Trauma: Downplayed. His tongue has a few cuts in the Assassination Island arc, probably related to his insanity-induced facial scars.
  • Tyrant Takes the Helm: In his introductory arc, where he briefly replaces Karasuma as PE teacher and assassination trainer.
  • Unknown Rival: It seems that Karasuma wasn't even aware that Takaoka was jealous of him and saw him as a rival.
  • Villainous Breakdown: He suffers a major one when Nagisa defeats him for the first time. In their second and final battle at the end of the Assassination Island arc, he suffers an even bigger one when Nagisa defeats him for good before tasering him unconscious.
  • Walking Spoiler: He was first introduced as a Nice Guy, even though it was early implied that he's not as nice as he acts. Also, he returns as the mastermind of the Hotel Arc.
  • Would Hit a Girl: His violence isn't restricted to the boys. He fiercely slapped Kanzaki when she defied him, almost knocked-out Kurahashi (Karasuma stopped him at the last second), and later wanted to bury Kayano with Koro-sensei in cement and anti-sensei material.
  • Would Hurt a Child: He uses violence against his students/disciples to suppress them. He knees Maehara in the stomach when he complains about their new training schedule, pimp-slaps Kanzaki to the ground, tries to slug Kurahashi in the face, and planned to beat the crap out of Nagisa to subdue the students once and for all. After his loss against Nagisa, he returns to poison the students with a deadly virus and destroys the antidote to make sure that they die slowly and painfully leaving only Nagisa alive to see his friends die even after Nagisa apologizes to him. He also tries to kill Nagisa himself when they finally confront him. Not to mention his plans for using the money he makes for killing Koro-sensei is to buy middle school children and forcibly give them the same virus to watch them die in agony over and over again.

     Hiromi Shiota 
Voiced by: Kotono Mitsuishi (Japanese) and Caitlin Glass (English)

Nagisa's overbearing, controlling mother. She first appears in Chapter 112, where she has been shown to have been trying to completely control Nagisa's life by making every meaningful decision for him and refusing to accept any disagreements on his part.


  • Abusive Mom: She's seriously unwell and gives poor Nagisa problems at home. She got better later.
  • Can't Take Criticism: An extreme pet peeve of hers. She has a major freak out when Koro-sensei tries to tell her that Nagisa need to be free to make his own way, not what she wants of him.
  • Control Freak: Like you wouldn't believe.
  • Disproportionate Retribution: Koro-sensei dares to try to tell her how to raise Nagisa? Well she'll just burn the Class-E building to the ground!
  • Freudian Excuse: She suffers from feelings of repression and a lack of fulfillment. Having been forced to study often and never been allowed to dress up as a child. While also failing to achieve the goals she set for herself as an adult. Resulting in her attempts to live vicariously through Nagisa by controlling his life.
  • Hair-Trigger Temper: She's all smiles until Nagisa (or Koro-sensei) try to disagree for her, at which point she devolves into a screaming harpy.
  • Heel Realization: It takes some time, but eventually she comes to realize her treatment of Nagisa was wrong and even apologizes to him for it. Adding that she's proud of him for "graduating from her" and finding his own way in life while also promising to be a better parent.
  • Meddling Parents: She's the Agent at first, trying to meet with Koro-sensei and later intending to meet with Asano Sr. in order to negotiate Nagisa's return to the main campus. However, she moves up to the Blackhawk when she tries to force Nagisa to burn down the Class 3-E campus in order to leave him with no other choice but to try and return to the main area.
  • Motor Mouth: Whenever she snaps.
  • Mugging the Monster:
    • Hiromi has no idea that Nagisa is being taught how to kill, much less that he developed the ability to camouflage his real intentions as a coping mechanism for dealing with her psychosis. Nagisa could, at any moment, kill her and she'd never see it coming.
    • And almost did get into this situation when an assassin confronted both Nagisa and her. Good thing Nagisa's assassination skills prevented this from happening.
  • My Beloved Smother: She asserts her control over Nagisa at every opportunity, trying to make every major decision for him in an attempt to guide him through the life path she wanted for herself. She refuses to allow him to have any say and even goes so far as to assert that, as the one who birthed and raised him, she owns him.
  • My Greatest Second Chance: In the epilogue, she and her husband meet Nagisa after the graduation ceremony, having reconciled after some counseling from Koro-sensei a month prior, asking their son to give them a second chance to become Good Parents to him. He tearfully accepts.
  • New Game+: This is the exact metaphor for how Nagisa describes their relationship. Hiromi intends to control Nagisa's decisions so that he can follow the path through life that she had wanted for herself, but was unable to follow through with, without any regard for Nagisa's feelings on the matter, like an NPC in a game. Koro-sensei's advice to Nagisa is to discover his own game route.
  • The Sociopath: Had some shades of this. Luckily she got better.
  • Wanted A Son Instead: Hiromi wanted a daughter, but Nagisa is a boy. She copes by forbidding him to cut his hair and forcing him to dress up like a girl whenever he's home.
  • You Gotta Have Blue Hair: Has dark blue hair, which is where Nagisa's blue hair probably came from.

     Aguri Yukimura 
Voiced by: Ayako Kawasumi (Japanese, TV anime), Whitney Rodgers (English) and Mirei Kiritani (live-action)

Class 3-E's former homeroom teacher.


  • Arranged Marriage: She was engaged to Yanagisawa as part of an agreement between their parents.
  • Birds of a Feather: She became friends with Koro-sensei because of their shared experiences as troubled young adults living in abusive conditions.
  • Buxom Is Better: During the flashback segment, she is revealed to have fairly large breasts, which is strongly implied to be the source of Koro-sensei's fetish. This is played up again during the Valentine's chapter, where Kayano gives Koro-sensei a chocolate with a picture of Aguri in a bikini to distract him while she tries to confess to Nagisa.
  • Cooldown Hug: She rushed towards Koro-sensei as he was going on a rampage after finding out he'll die in a year due to the antimatter experiments conducted on him and managed to calm him down. However, one of the tentacle guns fired toward him fatally wounded her. At this point Koro-sensei realizes that if she hadn't calmed him, he most certainly would've deliberately destroyed the world in his berserker state.
  • Died in Your Arms Tonight: In Koro-sensei's arms.
  • Dying Declaration of Love: In her final moments, she told Koro-sensei she was happy to die for him, because she loved him that much.
  • Everyone Can See It: Her students and her sister could easily realize she had fallen in love with man after seeing her in such a good mood thanks to the original "Reaper", now Koro-sensei.
  • The Faceless: Her face is never clearly shown in the flashbacks until Chapter 134.
  • Forgotten Fallen Friend: The Students of Class 3-E largely forgot about her through the course of the series. It was only after Kayano revealed her true motives that the class remembered about their former teacher.
  • Fun T-Shirt: She wore really weird shirts, which made her students and the human Koro-sensei question her fashion sense.
  • Go Out with a Smile: She died smiling, happy that she died for the man she loved and knowing he would become a wonderful teacher.
  • Last Request: In her final moments, she asked Koro-sensei to teach Class 3-E in her place, so he could learn about looking after others.
  • The Lost Lenore: To Koro-sensei. Her death had a huge impact on him and he became Class 3-E's teacher to fulfill a promise he made to her before she died.
  • Morality Pet: The first "Reaper", later known as Koro-sensei, developed a soft spot for her as she was the first person to be nice to him and look after him.
  • Nice Girl: She was kind, considerate and polite. She was the only person before Koro-sensei to believe in Class 3-E's true potential.
  • Nice Job Breaking It, Hero!: As well-intentioned as it was, telling Koro-sensei about his imminent disposal due to being a walking time-bomb may have not been the best idea, as it almost undid the good she did by interacting with him. In her defense, she was outright ordered to do so by her abusive boss and fiance, Yaganisawa. As everyone is aware, refusal is never an option to his orders, risks be damned, as his "punishment" tends to be far worse than whatever consequences occur from compliance.
  • Posthumous Character: She died before the beginning of the series.
  • Sensei-chan: She was young, attractive, nice and supportive to her students and had a funny fashion sense for her shirts.
  • Single Woman Seeks Good Man: She developed feelings for the original "Reaper"Koro-sensei because unlike the manipulative and abusive Yanagisawa, he was genuinely nice to her and supported her in her career as a teacher.
  • Star-Crossed Lovers: With the original "Reaper", AKA Koro-sensei.
  • Together in Death: In the epilogue, Kayano imagines that somewhere she and Koro-sensei are now watching over Class 3-E.
  • Too Good for This Sinful Earth: She is one of the few good adults in the series (so good even Asano Sr. had nothing but praise for her), and she ends up becoming a victim of Yanagisawa's madness.
  • Walking Spoiler: Her relationship with the original "Reaper", now known as Koro-sensei, is one of the overarching mysteries of the series that was only answered in the latter half.

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     Sakura Kiyashiki 
Voiced by: Hibiku Yamamura (Japanese, TV anime), Jill Harris (English)

A bitter young girl at the Wakaba Park Nursery.


  • Enfant Terrible: Of all the kids at the nursery, she is the least receptive to Class 3-E and even tries to attack Nagisa with a broom. This is because she was left with serious trust issues after being bullied out of Primary School. As Nagisa spends time with her, she becomes nicer.
  • Epic Fail: The aforementioned broom attack on Nagisa ends up with her falling through the floorboards and getting stuck.
  • Small Role, Big Impact: Compared to other characters, she doesn't play as much of a role in the story, being there mostly to hint at Nagisa's teaching ability, and her introduction comes relatively late on. However, she's the one who plants the idea in Nagisa's head to be a teacher when he graduates during a tutoring session.
    Sakura: Your path seems pretty clear to me. What have we been doing this entire time? You're gonna be a teacher, silly.
  • Sour Outside, Sad Inside: Her belligerent personality has been forged from her experience of being bullied in the past.
  • You Gotta Have Blue Hair: It's pink.

     Matsukata 
Voiced by: Kōsei Hirota (Japanese, TV anime), R. Bruce Elliott (English)

The principal of the Wakaba Park Nursery.


  • Cool Old Guy: He's mentioned to specifically take on students who are struggling with the waitlist for primary school and even though this strains their finances, he doesn't seem to mind very much. Once Class E have repaid their debts to him, he even shows up at the school festival with the rest of the kids to help them out.
  • Grumpy Old Man: Justified; he doesn't have much reason to be cheerful after getting flattened by Class E's carelessness, since his injury is going to leave him out of action for a long time. He mellows out once he sees how the impact Class E's experience has had on them and and his charges, however.
  • The Scream: Gets a pretty epic one when Koro-sensei reveals himself to apologise. The latter overdoing it can't have helped.
  • Secret Keeper: He becomes perhaps the only person outside of Class E and the Government to know of Koro-sensei's existence after the latter reveals himself to him to apologise.

     Rikuto Ikeda 
Voiced by: Daiki Yamashita (Japanese, TV anime), Bryce Papenbrook (English, TV anime)

One of Gakuhou Asano's former students.


  • Driven to Suicide: The poor guy ended up getting bullied badly enough to resort to this. Mr. Asano took it very poorly.
  • Nice Guy: He was something of a brat when he was younger, but from what little we can tell, Mr. Asano molded him into a friendly, caring student. Too bad he died before we could see any more of this.
  • Posthumous Character: Already long dead by the time the series starts, having killed himself thanks to being bullied, which Asano took to be his greatest failure.
  • Satellite Character: Only really existed to show why Asano is the way he is.
  • Small Role, Big Impact: A character who is only mentioned posthumously; his suicide is pivotal to Gakushou Asano's sadistic model of education.


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