History Fridge / AssassinationClassroom

* Korosensei's statistics page in Volume 1 states that his history is "agent of destruction/teacher." While obviously blowing up the moon would qualify him as the latter, his earlier profession as [[spoiler: an assassin]] would also fit this pretty well, making it ''very'' well-hidden ForShadowing.

* It could be chalked up to EarlyInstallmentWeirdness, but late in the story Koro-sensei reveals that his tentacles make him ''fast'' but not correspondingly ''strong'', and in terms of his actual strength he isn't that much stronger than a human being. Except in early arcs he was shown casually handling anti-air missiles, even holding one in place perfectly when its rocket fired, without any apparent effort. That would require a ''tremendous'' amount of strength. One has to wonder if he made up that weakness entirely.

* In chapter 133, Korosensei starts revealing his back-story by stating that [[spoiler:he was once an assassin known as the "God of Death" two years ago.]] All of a sudden, all of the advice he gives and all of the lessons he taught to his students about assassination makes sense - [[spoiler:he was once [[WorldsStrongestMan THE Best Assassin In the World,]]]], so of course he'd be the best teacher for a class about assassinations, particularly his own.

* The Chairman's heart, while twisted, was in the right place by wanting his students to come out from his teachings stronger mentally and physically, thanks to his previous student's [[spoiler: [[DrivenToSuicide suicide]]]]. But with his emotionally exhausting teaching methods, his brainwashing, and his strictness, who's to say that somewhere down the line his students won't come out of there [[spoiler: suicidal]] as well?

* Notice in chapter 149 [[spoiler:Nagisa didn't release Karma until Karasuma announced the surrender formally?]] In fact, Nagisa was still holding on with all his might, choking [[spoiler:Karma]] until he learned his side had won. This makes sense when you realize Karma is a dangerous BloodKnight who doubles as a bit of ManipulativeBastard. Nagisa has seen Karma repeatedly beat people up and very rarely plays fair. During Karma's fight with Grip, he fights them evenly before faking being knocked out in order to finish off the assassin. Nagisa probably believed that that was what Karma was doing; trying to get Nagisa to release him so he could win. Nagisa, unlike the vast majority of Karma's opponents, has known him for a long time, and as such is used to Karma's tricks. There was no way he would take any chances until the surrender was for certain.

* During the God of Death arc, we see more of Irina's backstory and her start as an assassin. There's a particular panel where she describes her second ever job, which depicts her mostly-nude in bed slitting the throat of a man pushing her down. Based on how young she looks and the fact that it was so early in her career, she probably became a "honeypot" disturbingly early...

* During the GoD arc, we see more of Irina's backstory and her start as an assassin. There's a particular panel where she describes her second ever job, which depicts her mostly-nude in bed slitting the throat of a man pushing her down. Based on how young she looks and the fact that it was so early in her career, she probably became a "honeypot" disturbingly early...

* Irina and Ritsu became part of the first opening as soon as they became part of the assassination classroom cast. But Karma, unlike the former two who were previously absent in the opening, was there from the start. This is because he was already a student at Class 3-E, thus already an official member of the cast. His only reason for not being present in the until the end of episode two was because he was under suspension.

* The students sure seem to like shaking their hands around during season one's openings. But that's not all;if you take a closer look at their hands they form two gestures:a closed hand moving back and forth (as if holding a knife and stabbing someone), and an open hand (a gesture used for calling a teacher's attention to either ask a question or to answer). It is a neat symbolism of their relationship with Koro-sensei, who is their target AND their teacher.

* How come Kanzaki didn't get a haircut during the taboo game? She's either been taught to be really kind [[spoiler: by her really strict parents]] or it's because [[ of her experience as a gamer during her delinquent phase.]] Turns out she is that good at games.

** Meanwhile, the same events would've occurred for Nagisa: [[spoiler: Takaoka would have trapped him on the heliport and blown up the antidote, sending Nagisa spiraling into his UnstoppableRage--except Terasaka wouldn't have been there to throw him the stun gun and snap him out of his bloodlust. Without a clear head and the second weapon, Nagisa would not have been able to utilize the secret technique, rendering him powerless to stop Takaoka from murdering him]].

* Kayano's obssesion with big boobs? [[spoiler: It's probably a symptome of the tentacles, as both Korosensei and Itona were shown obssesing about big boobs.]]

* Nagisa in the final [[spoiler: has not grown an inch since middle school, his parents never got back together, and is placed in a, possibly dangerous, classroom full of delinquents.]] He [[{{Badass}} still makes it work]], which works perfectly for the biggest character and ultimately TheProtagonist of the series. No, he didn't get exactly what he wanted, but he can keep going anyways and manage to succeed...something that is a good thing to show to the readers.

* Kayano's obssesion with big boobs? [spoiler: It's probably a symptome of the tentacles, as both Korosensei and Itona were shown obssesing about big boobs.]]

* In Kayano's spotlight chapter, she builds a giant, bomb-concealing pudding for the purpose of killing Koro-sensei. The other students help her, and [[FriendshipMoment a good time is had by all]]. Finally, just Koro-sense is about to eat the finished pudding, Kayano ''flips out''- she has so many good memories associated with that pudding that [[{{Foreshadowing}} she can't bear to see it destroyed]]. [[spoiler:The same thing happens dozens of chapters later with her 'false' persona, which was created for the same reason.]]

* Back on the page for UsefulNotes/The47Ronin, it mentions that a lot of the characters in ''Assassination Classroom'' are named after them, with Koro-sensei being an analogue to Kira. the oft mentioned question of [[spoiler: the possibility of Kira dying of natural causes before the actual assassination happens]] is finally given an analogue as through the simple fact that [[spoiler: Koro-sensei could [[SecretlyDying eventually meet his end in such a fashion]] if the students don't kill him themselves by March, with the rest of the world hanging in the balance as well]].

* The Chairman's heart, while twisted, was in the right place by wanting his students to come out from his teachings stronger mentally and physically, thanks to his previous student's [[spoiler: [[DrivenToSuicide suicide]]]]. But with his emotionally exhausting teaching methods and his strictness, who's to say that somewhere down the line his students might come out of there [[spoiler: suicidal]] as well?

** Behold chapter 173.

* Nagisa in the final [[spoiler: has not grown an inch since middle school and is placed in a, possibly dangerous, classroom full of delinquents.]] He [[{{Badass}} still makes it work]], which works perfectly for the biggest character and ultimately TheProtagonist of the series. No, he didn't get exactly what he wanted, but he can keep going anyways and manage to succeed...something that is a good thing to show to the readers.