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Koro-sensei is a character from Yuusei Matsui's manga Assassination Classroom. He is a teacher who appears as a silly-looking yellow humanoid octopus creature wearing a perpetual grin, a graduation cap, and a toga. He instructs Class E to kill him before he destroys the Earth - if they succeed, they graduate. Naturally, this is easier said than done, considering that a bunch of teenage assassin wannabes has to fight against a super-intelligent creature who is responsible for destroying part of the Moon and literally turning it into a crescent.

Since killing the "unkillable" teacher is the main goal of the story, his death will inevitably happen at some point. But the questions are, when will he die? Can his students successfully assassinate him before the Earth is destroyed? Will Koro die by other causes, or will he get killed at the hands of someone outside his class (or even himself)?

Koro-sensei is Assassination Classroom's most popular and recognizable character, and is highly regarded as one of the best teachers in the anime and manga fandom. He enjoyed a string of successful results in notable saimoe tournaments during the anime's runtime, marking his name in the pantheon of male champions in the process. In particular, Koro was the second male (after Lelouch) to win the International Saimoe League and /r/anime's Best Guy contest, having done so from 2017 to 2018. He is also the most popular guy to have never won China's Bilibili Saimoe, having placed 2nd in 2015 and 2016 before being overshadowed by the brigading wars in 2017.


ISML Profile Flavor Text (May contain spoilers)

"Life as a student in Korosensei’s class is truly bizarre. Not only is he a large, yellow octopus-like monster who is threatening to blow up the earth in a year, he is also strangely the best teacher one could ever ask for!

Claiming to be the one responsible for partially destroying the moon, he is a creature of extreme power and speed. He can fly at speeds not humanly possible, dodge any attacks aimed at him, and use his tentacles to multi-task with skill. If that was not enough, he is also highly intelligent. He can teach any school subject under the sun and is adept at problem solving.

However, despite his physical and mental perfection, Korosensei is a man riddled with weaknesses as well. He is quick to panic. He is quite the pervert. He cannot swim. The list goes on. His biggest weakness, however... is his weakness for his beloved students.

Korosensei is like a doting father. He cares very much for every student in his class and would go to any lengths to help him or her grow better as a person. And when the time comes, he would risk his own life to protect them at all costs.

It is strange to have your assassination target also be your mentor, your teacher, and your best friend all at the same time. But nobody who was ever taught by Korosensei would complain."


Major Contests[]

International Saimoe League

Contest Wins[]

Total Wins: 3 (ISML Lapis Scepterr/anime's Best Guy Winner)(does not include ISML gem / exhibition awards)

  1. ISML 2017 Lapis Scepter ★
  2. r/anime's Best Guy 4
  3. Animebracket Best Teacher Contest

External Links[]

Beware of spoilers and pop-ups.

International Saimoe League Champions
Heavenly Tiara
Fate Testarossa Fate TestarossaHinagiku Katsura Hinagiku KatsuraMio kon.png Mio AkiyamaMikoto.png Mikoto MisakaKanade.png Kanade TachibanaRuri Gokou Ruri GokouKotori Itsuka Kotori ItsukaEru.png Eru ChitandaShana.png ShanaMegumi Katou Megumi KatouRem.png RemViolet.png Violet EvergardenYukino.png Yukino YukinoshitaElaina.png Elaina • 2022
Lapis Scepter
Lelouch.png Lelouch vi BritanniaExKirito.png Kazuto KirigayaExHoutarou.png Houtarou OrekiExHideyoshi.png Hideyoshi KinoshitaExAccel.png AcceleratorSora.png SoraKoro.png Koro-sensei8man.png Hachiman HikigayaRimuru.png Rimuru TempestMiyuki shirogane.png Miyuki ShiroganeSakuta.png Sakuta Azusagawa • 2022
Ex - Exhibition tournament: Counted as official winners, but not recognized on the ISML website's main page
ISML Pendant Winners
First year of pendant win only. Crowns from 2015 are included.
2015 8man.png 8manYuzuru.png OtonashiArcher.png ArcherKoyomi.png KoyomiSora.png SoraAccel.png AcceleratorLelouch.png Lelouch
2016 Koro.png Koro-senseiKiritsugu.png Kiritsugu
2017 Nagisa assclass.png Nagisa S.Levi.png LeviSouma.png SoumaTouma.png Touma
2018 Okabe.png OkabeTaki.png TakiWillem.png Willem
2019 Rimuru.png SlimeRiku.png RikuSakuta.png SakutaKiyotaka.png KiyotakaTomoya.png TomoyaYuuta.png Yuuta
2020 Miyuki shirogane.png ShiroganeIshigami.png IshigamiGilgamesh.png Gilgamesh
2021 Sorata.png SorataKirito.png Kirito
/r/anime Elite Eight
Major Character Champions
Best Girls Kurisu.png Kurisu MakiseYukino.png Yukino YukinoshitaMikoto.png Mikoto MisakaRin tohsaka.png Rin TohsakaRem.png RemAsuna.png Asuna YuukiKaguya.png Kaguya ShinomiyaMaisan.png Mai Sakurajima
Best Guys Lelouch.png Lelouch LamperougeKoyomi.png Koyomi AraragiSpike.png Spike SpiegelKoro.png Koro-senseiMob.png Shigeo KageyamaLevi.png Levi AckermanMiyuki shirogane.png Miyuki Shirogane8man.png Hachiman Hikigaya
Best Chars. Roy.png Roy MustangHitagi.png Hitagi SenjougaharaShinobu Oshino Shinobu OshinoOkabe.png Rintarou OkabeEdward.png Edward Elric
Other characters
Bold indicates former runner-up
C - Also reached Elite Eight in Best Character
C2 - Finished runner-up in Best Character
Best Girl Ai HayasakaAquaChika FujiwaraCChiyo SakuraEmiliaEru ChitandaHoloHimeko InabaJibrilMayuri ShiinaMeguminC2Megumi TadokoroMikasa AckermanOchako UrarakaRyuuko MatoiCSaberCShouko NishimiyaCSuruga KanbaruTaiga AisakaTohruWinry RockbellYoko LittnerYui Yuigahama
Best Guy All MightAlphonse ElricArcherDeishuu KaikiErwin SmithCGintoki SakataCGutsHisoka MorowIzaya OriharaJoseph JoestarKaminaKazuma SatouCKillua ZoldyckKiritsugu EmiyaKraft LawrenceLight YagamiCReigen AratakaCRimuru TempestSaitamaCSakuta AzusagawaShouya IshidaSouma YukihiraSubaru NatsukiTanjiro KamadoYuu IshigamiC
Best Char. Eren YeagerHaruhi SuzumiyaHomura AkemiRider (Fate/Zero)