Assassination Classroom: A theory on Koro-sensei's identity and past life (Updated:3/17/15)

BEWARE! CONTAINS A LOT OF SPOILERS!~

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      For those of you who have watched the Anime, this might spark your curiosity. As I was reading the latest Manga of Assassination Classroom, I bumped into a thread where someone actually made a theory about Koro-sensei's true identity. Though it is not proven and it still has holes in the theory, we'll just believe in this temporarily... Here's the original post at the Mangafox Forums by AkumaKnight, but here it is:

He was human before his transformation into the current version of himself. However, before he was a scientist who worked on high clearance/ classified research projects for the Government. One day an alien Parasite crashed to earth and Koro-sensei(Human) was part of the team who ran experiments on it to determine what it was and if it had any military applications. One of the experiments enabled the Human Koro-Sensei to temporarily bond with the parasite, which enabled him to see that it was part of a larger collection of Alien parasites, who were now aware that there is life on Earth (because of Koro). Because, of this Koro-sensei and the research team continue to test the parasite to figure out its weaknesses (A bit how class E, are trying to discover all of Koro-Sensei's weaknesses), in order to fight back against the alien parasites heading to earth. However, they're unsuccessful and so Koro- Sensei decides to bond with the parasite permanently to fight off the invaders thinking that it will grant him the power to defeat them, but Koro-sensei is unable to control the parasite initially and enters into a raged state in which he kills everyone in the lab and damages the moon. After, destroying part of the moon Koro-sensi calms down and returns to the lab after realizing what he did. The woman he killed is his love interest she is the daughter of the head scientist in lab (The guy in the white anti-sensei robes; he wears the robes because he is burned from Koro-sensei's rage and because of the tactical advantage).She is the teacher of class E who frequently visits the lab to see her father and Koro-Sensei. He is distraught at what he has done, In her final moments she reminisces about her school days with class E and tells Koro-sensi to teach the children in class E in her place. Koro-Sensei follows the dying request of the woman he loves and so he strikes a deal with the government to teach class E. Koro-Sensei is teaching the class about assassination so that when the alien parasites come to earth class E will be able to fight them and save the earth (the one thing Koro-Sensei couldn't do). So, Koro-Sensei wants the class to kill him so that they are strong enough to defeat the impending invasion.

It is a very strong theory and yet it still has its holes to fill in as the Manga is reaching to the point where Koro-sensei is ready to tell his tale of the past. Here's the link of the Manga (Updates every Monday (SEA TIME)) if you are interested to spoil yourself and go beyond the Anime:  ANSATSU KYOUSHITSU Manga

I'll leave the imagination to you people *Koro-sensei laugh*.

UPDATE 3/17/15

   

       And so I return to my laptop and gathered more information. Here's the original post from the forum if you want to check it out: setokayba's post

First, I would like to arrange what he has stated in his post in a more understandable statement. The pictures that I am about to show you are from the Manga and these are not mine (note the credentials on the bottom of every manga page).

Chapter 12 

In this page of the manga or rather this was already in the anime, the Board of Director or the Principal of the school said something to Koro-sensei. Not many understand this but he stating something that had happen from the past. My guess is that he was supposed to be a hero but the world marked him as a destroyer. This links up pretty much on the theory a use has made above this update.

"However, they're unsuccessful and so Koro- Sensei decides to bond with the parasite permanently to fight off the invaders thinking that it will grant him the power to defeat them, but Koro-sensei is unable to control the parasite initially and enters into a raged state in which he kills everyone in the lab and damages the moon."

Chapter 2

 This was the time when Nagisa asked Koro-sensei why he chose to teach Class E and become their moderator or.. teacher. And Sensei's answer involved a promise with someone. Probably the past teacher of Class E who is Aguri Yukimura. There's not much info of her yet so let's just wait for time to tell the tale.

 Chapter 3

Now here, the girl is probably Aguri Yukimura and the alien thing is probably Koro-sensei. The theory states this: 

"After, destroying part of the moon Koro-sensi calms down and returns to the lab after realizing what he did. The woman he killed is his love interest she is the daughter of the head scientist in lab."

So which means he is involved with the death of Aguri and either accidentally killed her or was because of his rage.













Chapter 19

While they were in Kyoto (because of their school trip), Koro-sensei was being chased because of peeking into gossips of the boys and girls of Class E. He then said the students almost spilled the bean about his love life and his past was packed with tales of romance. It was when Karasuma asked him that all those happened when he still had two hands and two feet. And complete silence followed. This probably means that Sensei's past was really that, I don't know, confidential? Well, the picture above this give us a hint about this.














Chapter 30

This is still not part of the anime but wudeva', we're just trying to give justice on the theories that people have made and trying to uncover what Koro-sensei really was. And so in Chapter 30, another transfer student came to Class E under the name of Itona Horibe together with Shiro the first transfer student was Ritsu or the Autonomously Thinking Fixed Artillery. Itona claims to be the brother of Koro-sensei but in a sense that they both have tentacles. Then there's Shiro, in a white robe, telling Koro-sensei that the face he made was the same on when the lab exploded. And the person that got hit by Koro-sensei's tentacles is most probably Aguri Yukimura. The theory also said this in parenthesis: 

"The guy in the white anti-sensei robes; he wears the robes because he is burned from Koro-sensei's rage and because of the tactical advantage."

But we are not sure if that is true or he is referring to someone else in white robes.


Chapter Unknown (Ripped Page)

Here's a page that got ripped off the Manga (I think. I haven't read the whole manga, only the latest ones) that was discovered by the user Love Potato. Click on the name for the source.
Now this page really could be a proof that Koro-sensei could either be an Artificial Human or had already acquired the alien Parasite. Who knows, everything is slowly getting revealed in the mange so like what I said, let time tell the tale.

Scenes in the Anime

Episode 06

Episode 02

Episode 01

Episode 08

That is all for today folks As I said, the images are not mine and some statements with a source. So if you find more theories and proofs, or if you would like to leave your remarks, just post in the comment section below this post. Let us ready our shovels and dig the truth!
(I had to fight off the placings of these scenes (._.))