Koro Sensei

Koro Sensei is the main mentor of Assassination Classroom, and appears in the Fiction V. Fiction episode, All Might vs Koro Sensei, where he fought All Might from My Hero Academia.

## History

Born in an unknown country, he grew up in a corrupt slum where anyone could betray anyone with almost no reproductions. Having no name, family, nor birthday, he became an assassin, and was damn good at it. To the point he was given the name, The Reaper. He always pulled off a job with no failures, leaving no evidence that he was ever there, and his identity being completely unknown. Though one day when he assassinated a wealthy business man, this guy's son witnessed the work of The Reaper.

Though instead of being sad about his dad's death, he was in awe at The Reaper's talents. This is when The Reaper took him in as an apprentice. But while The Reaper was the most intelligent and dangerous man alive, he wasn't a good teacher. He instilled fear and respect, showing that no matter how good the kid got, he would always be better, viewing him as only a tool instead of a student.

This is when the kid betrayed The Reaper, turning him into the government while on a mission and taking the title of The Reaper for himself.

This was when Kotaro Yanagisawa took The Reaper, and used him as a guinea pig. Yanagisawa's goal was to make large amounts of anti-matter using the growth of human cells. But in this lab is where The Reaper also met Kayano's sister and arrange fiancée to Yanagisawa, Aguri Yukimura.

Aguri, the teacher to 3-E with weird tastes in shirts, was abused by Yanagisawa. But she was assigned to keep a close eye in The Reaper because she was viewed as expandable if The Reaper were to break out.

The Reaper and Aguri would bond, with The Reaper teaching Aguri some things to help her teach the students, and Aguri teaching The Reaper comparison.

Of course, Yanagisawa would keep up his experiments of The Reaper, with the experimentation causing The Reaper to start gaining tentacles. Yanagisawa would also do the same to a lab rat and was put on the moon.

But over the course of a year, the two would become friends and grew close to each other. The Reaper becoming more human than ever, despite his body changing and his fingers becoming more noodly.

However, on the first anniversary of the two meeting, the rat that had been planted on the moon for the same experiment of The Reaper had imploded and destroyed 70% of the moon because of the anti-matter.

This was when they found out that the same thing would happen to The Reaper in exactly a year and would take the world with him.

Learning that he was fated to die, The Reaper went on a rampage and escaped his prison. And he would've destroyed the whole city at the very least if Aguri didn't snap The Reaper back to his senses, but at the cost of her own life.

If Aguri didn't die, The Reaper would've gone on the end the world. But his love for her brought back his humanity, despite no longer really being human.

In her dying breaths, Aguri asked The Reaper to promise her that he'll teach class 3-E, to give those students another chance with his talents in teaching.

The tentacles asked The Reaper what he wanted to be. The Reaper wanted to be weak. A creature that appears helpless. Something so ridiculous that you want to just squeeze him to death! Something that can suss out the vulnerabilities in other creatures with its tentacles. That can protect them, and lead them. That was the creature- the teacher he wanted to become.

## Trivia

* Name: Koro Sensei
	+ Alias: Grim Reaper
* Age: Unknown
* Height: 9'11
* Weight: Lighter than you think
* Teacher of 3-E
* World's biggest target

## Feats

### Strength

* Destroyed 70% of the moon
	+ Supposedly
* Absolute Defense Form transformation destroyed a dock
* Bust out of a structure made of water, anti-him BBs, iron plates, and concrete
* Broke sheets that were made to withstand a tank
* Made a blast that overpowered Reaper 2.0
	+ Would be worth 979 kilotons of TNT

### Speed

* Clocked at Mach 20 at the start
	+ Been stated to be faster
* Outpaced a grenade explosion
* Catch missiles
* Blocked several bullets
* Made up to 952 visual clones
* Caught an entire pot of soup with an eye drop faster than a blink of an eye
* Avoided raindrops
* Spun fast enough to make a tornado
* Dodged a beam of light

### Durability

* Survived a strike to his heart
* Withstood Itona's and Kayano's tentacles
	+ Itona's could destroy a semi-truck, and Kayano's was stated to be stronger
* A nuclear bomb couldn't scratch the Absolute Defense Form

### Experience

* Was the world's greatest assassins
* Taught a whole class about assassination
	+ Taught the same class all the subjects the school gave up teaching them
* Countered countless assassination attempts
* Defeated Yanagisawa and Reaper 2.0

### Intelligence

* Outsmarted the principle
* Learned every subject he had to teach his class to a T
* Made tests specially made for each student
* Memorized every textbook in Japan
* Accurately replaced cells

### Arsenal

* Tentacles
	+ Unknown amount
	+ Drills
	+ Turn into a giant net
	+ Detect any difference in muscles
	+ Block dust while flying
* Enhanced smelling
* Zoom vision
* Shed his skin
* Slime
	+ Caught a bullet
	+ Turned a bath into jello
* Camouflage
	+ Can change the color of his skin to anything he wants
* Visual clones
	+ Up to 952
* Liquid form
* Absolute Defense Form
	+ Creates an explosion when he transforms
* Energy he fires from his tentacles
* Regeneration

### Weaknesses

* Sore loser
* Motion sickness
* Love gossip
* Shedding and regeneration slows him down
* Losing a tentacle will reduce his speed
* Boobs
* His heart is his weak point

## Quotes

Sorry I'm late. I just couldn't resist!

Thank you once again for meeting me out here, All Might.

Well, I thought it'd be interesting for our students to maybe teach each other a few moves for fighting. Your class always seems to be up to some action, and could teach my own students a few things I wouldn't be able to.

Bingo! And I thought that if I had a little spar with their Symbol of Peace, I can get a much better idea than just reading about it.

Oh, I wasn't expecting you to go easy! Though that is if you'd be able to even hit me.

Seems like you're just a bit too slow. Had enough time to do up your nails. I think pink suits you well, don't you?

Over here! I'm right here! Here I am!

Oh, it's nothing but a scratch.

Seems like you're as strong the news makes you out to be! But I think I'm still faster!

Not wise to use a move you already used in the same fight. A good assassin can perfectly read your attacks.

For the number 1 hero, I'd expect better from you!

I've found your weakspot!

He's good... So I'll just have to kick it up a notch!

Show me everything you have!

I've seen this one before!

He's good... I gotta end this no- AHH!

You're right, I did say that! So let's kick it up a noche!

Can you still keep up with me now!?

Fine then! You wanted my best!?

Then...

Here...

It...

IS!!!

It's alright... We both went a bit too far...

You're a great hero... And a great teacher...

If we meet again on the other side... Let's do this again...

Goodbye... All Might...

## Trivia

* Koro Sensei is the creator's favorite character of all time
	+ Assassination Classroom is also their favorite series of all time
* Koro Sensei is the tallest character in Fiction V. Fiction
* Koro Sensei has multiple ways of spelling his name throughout the series (Korosensei, Koro~Sensei, KoroSensei), but Koro Sensei was choses due to it being the most recognizable