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This is a "Wild Mass Guess" entry, where we pull out all the sanity stops on theorizing. The regular entry on this topic is elsewhere. Please see this programme note.
Ansatsu Kyoushitsu
Two new transfer students will join Class-E
If you look at the seating chart, there are three empty seats; the one next to Ritsu is occupied to Itona. And if you look closely, each vertical row are occupied by students with the same gender. That means the new transfer students would be girls. This would also balance the number of boys and girls, and everyone could shipped together.
  • Another option: Yuuji will join the class because of his crush on Nagisa.
  • A Class A student will join the class.
    • Chairman Asano will punish his son by putting him in this class if Asano Jr. will be humilated again, a sign of Parental Abandonment. Or because Asano Jr. will discover the truth behind the class, so the chairman will be forced to "seal" him away.
  • Two unhumans will join the class. Just look at Ritsu and Itona.
  • Tanaka and Tadaka, Those Two Guys from the main building who always pick on Nagisa, will drop into Class 3-E. Hilarity will ensue at their expense as they try to adjust to the assassination lifestyle.

"The God of Death" is the Chairman Asano
When Lovro tells Nagisa about the "The God of Death", we see the chairman observing Class-E via monitors with a hidden face.
  • Jossed. The assassin has a different hair color.
  • The man with the monitor wasn't the chairman, but really the "God of Death". He's eating the chocolate bar.

"The God of Death" is the mysterious Yukimura-sensei
Yukimura-sensei stopped teaching Class-E and disappeared the month the story started to focus more on his part-time job as the assassination world's most feared and ruthless hitman.

Kaede Kayano has a hidden special skill
Each student in this class has a speciality, but Kayano, the girl we see the most, has not really done anything yet and she's pretty much The Load. Like Nagisa, she must have a special skill that has to be shown yet.
  • Well, we have some kind of answer to this now. She seems to have a knack for logistical organization, and an extreme love of pudding. Whether that qualifies as a "special" skill or not, YMMV.

Alternatively, Kaede Kayano is important to the plot
Maybe her skills are average to the other students, but she is important plot-wise.
  • She is related to the woman who died in the first chapter. Maybe her daughter? Hey, this is WMG

Itona will have a Heel-Face Turn
Koro-sensei frequently offers him to stay in the class.
  • Confirmed in chapter 87.

Gastro, Smog and Grip will come back
It's implied that they will show up in the future.
  • It is possible that they become tutors/teachers as well. All of them are very skilled and they never used their full abilities during the Assassination Island arc. Gastro is a professional marksman and he could be a great teacher to Chiba and Hayami. Smog's ability to create poisons could improve Okuda's skills, and Grip could teach the more physical fighters some of his techniques.

Koro-sensei doesn't have a choice
He would destroy the world within one year, but it is not due to his own will. He is also probably have a case of I Cannot Self-Terminate. So he gives the students chance to kill him to prevent the destruction of the world. Also, he has to be killed in a certain way to be really dead.
  • The destruction of the moon? It's a fail suicide attempt.

Nagisa is also a being similar to Koro-sensei and Itona
Tentacles seem to start with the hair and Nagisa does seem to have unusually lively twintails that correspond to his mood.
  • Itona was originally human, and the tentacles were implated after his parents abandoned him. Now that he lost his tentacles, Shiro wants Nagisa as the next experiment.

Koro-sensei didn't actually destroy the moon
And he wouldn't destroy the Earth either. The true culprit is another being similar to him, something he cannot defeat. He hopes that by being defeated and killed by humans, they will get enough power and experience to kill the true Big Bad.

There will be Itona and Ritsu ship tease
Now that we know Itona's backstory, pretty please?

Nagisa's parents are divorced
This theory is gaining popularity on Japanese message boards, so it bears discussing. Proponents suggest that Nagisa was sent into class E because of the social stigma associated with his parents getting divorced.
  • Pro: The first time we see Nagisa's father, they're having breakfast at a sushi bar, not at home. We learn that they do not see each other often, and that they both seem to have a difficult relationship with Nagisa's mother. Since children in Japan usually change their last names to match the parent who gets custody of them, the reason that absolutely nobody calls Nagisa by his family name could be because his family name is his mother's.
  • Con: Nagisa's former homeroom teacher all but directly says that Nagisa's failing was poor grades, since his own rating was lowered because of Nagisa. Nagisa also says that nobody in his family looked him in the eyes after he was assigned to class E, which would indicate a failure on his part, not theirs. Nagisa also cuts his meeting with his father short to go off with Koro-sensei. Visitation rights in Japan are extremely limited, so this would be very odd if it was their only chance to see each other. It is more likely that Nagisa's father has a job that forces him to travel around a lot, and when he and Nagisa have breakfast in chapter 76 he's just returned and will be back for at least a while.
    • In message boards and blogs, the main consensus is that Nagisa's grades dropped because of the strain he suffered because of his parents divorce. Apparently, the "not looking on the eyes" line is usually interpreted as referring only to his mother, since he's been living only with her since the start of the story.
    • The time frame in which he has been living only with his mother isn't clear. It might have been since the start, or for a shorter period. Also, saying he was referring only to his mother in chapter 40 is strange. Why wouldn't he just mention his mother, instead of talking about "kazoku/members of family"? He seems to have no siblings.

Gakushuu Asano will not realize what exactly is going on in Class 3-E, until years after Koro-sensei has been killed.
Years after they graduate, Gakushuu will need a hitman, possibly to even kill his own father to take over the school. And after thoroughly looking into available high quality hitmen, he will come across Nagisa's name, and soon many other from the class 3E as well. It's only then that he will realize just exactly what kind of special training were they getting there.

Nagisa takes after his mother...including in his talents for assassination.
Nagisa's dad seems like a pretty nice guy, and Nagisa mentions that his mother is the difficult one. Since Nagisa's dad seems pretty milquetoast, it's very likely that Nagisa takes after his mother. If his parents have been separated for an extended period of time, it's very likely that he could have become the way he is from her. Alternatively...

Nagisa takes after his father, who is The God of Death.
It makes sense. They look alike, and Nagisa's father lives away from the rest of the family. Nagisa could easily inherit his old man's skills, or even be TAUGHT by him (though that is implausible). The one thing that rules this out is the seeming quickness The God of Death finds Lovro, but it's never specified how much time passed between the two scenes.

Nagisa takes after his STEP-father, who is The God of Death.
Following the WMG above about his parents divorced and his mother later marrying someone else. It was his step father who was the god of death.

Koro-sensei Was Once a Man
All the origins seem to show that Koro-Sensei was born in a vat, and he appears human-like in some flashbacks. What if he was subjected to the same experiment on Itona? He could be a Super Prototype, if that's the case.
  • Chapter 30 has a brief flashback of a human hand turning into tentacles.

The woman from Koro-sensei's past is the Chairman's wife!
I actually read this in the comments page of some manga reading site so apologies for stealing this. But I thought hey, mangas always pull something like this so why not. She wanted someone to stop her husband's evil educational tyranny (and her son was already turning into a clone of Daddy) so she decided to send an alien in to teach the bunch of kids her husband terms "rejects". Might also explain why the Chairman knows something about Koro-sensei's past.

The woman from Koro-sensei's past was Class 3-E's previous teacher.
She was a kind teacher who suddenly vanished because she was killed off in the incident that turned Koro-sensei into a supercreature (if you believe that WMG), and her Last Request was for Koro-sensei to teach Class 3-E in her place. She usually appears in brief flashbacks right before Koro-sensei declares his concern for his students, and in each of them she obviously meant a lot to Koro-sensei.

It would really justify why he's so protective of his students and motivated in helping the kids excel: Being their teacher, and thus keeping the promise he made to someone who was very precious to him, is more important to him than the end of the world.

Rather than becoming hitmen, Class E joins the military's special forces. Or opens their own mercenary business.
Their skillset isn't limited to being assassins and they already have a link to the military through Karasuma and the others. They also tend to work best as a whole Badass Crew while being hitmen seems more like a solo affair.

Nagisa's mother is Aya Asia, and his father is really Neuro.
It would tie into the author's previous series, and explain a lot about how Nagisa thinks. Also, Aya would likely not be a very good mother, what with the life in prison and the "I can't love anyone" thing, so it makes sense.

Asano will have an Enemy Mine with Class E against Chairman Asano
Asano is not only an Antagonistic Offspring, he is visually disgusted of Chairman Asano. Apparently, Asano does not want to become exactly like him and he will not take Chairman Asano's lessing about losing, but he will team up with the very opponents who defeated him in the exam bet and in boutaoshi.

Nagisa is actually Quetzalcoatl, the Mayan Feathered Serpent.
Hear me out: The snake imagery, the the potential for death, the feathery hair (including the winglike tufts), and the implication that Nagisa is the best chance of succeeding in the assassination leads me to believe that Nagisa is far less human then is shown. Even if he isn't literally Quetzalcoatl, he might be its incarnation.

The moon is not really blown up.
The moon controls the tides, and since there's no news of apocalyptic storms, Korosensei probably did not blow up the moon like we think he did. Knowing his policy for improvement, he might have even altered the tides to be better for the planet.

Koro-sensei destroyed the moon, but not by blowing it up.
Nevermind that they explicitly say that the moon exploded; that was the best logical explanation they could come up with for the sudden disappearance of 70% of its volume. Koro-sensei actually converted all of that moon mass into energy (via some method of E = mc^2 ) and stored it inside his body. It forms the crystallized energy of his Ultimate Defense and provides more than enough energy to keep him healthy unlike Itona, whose tentacles require three nuclear power plant's worth of energy to function properly for a month.

Koro-sensei blew up the moon, and its fragments became his kryptonite.
The moon's fallout became the basis for the anti-sensei material used in their knives and bullets, and the strange beam of light that Shiro uses to stiffen Koro-sensei's cells is synthetic moonlight that utilizes the same anti-sensei technology.

Kataoka's hairclip will become a Chekov's Gun.
The anti-sensei hairclip she made specifically for underwater assassinations was never utilized during her arc.

During the final days before the Earth's destruction, the government will nuke Kunugigaoka in a desperate, last-ditch attempt to save the world.
One of the world leaders made the suggestion, which was quickly dismissed not because it would endanger innocent lives but because they figure Koro-sensei would just outrun the explosion. What better way to keep Koro-sensei in range of the nuke than a bunch of civilians in harm's way?
AnotherWMG/Anime & MangaAquarion Evol

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