Original Name 殺せんせー
Romaji Name Koro-sensei
Nicknames Homeroom Teacher, Koro Sensei, Koro-Sensei
Series Ansatsu Kyoushitsu: Jump Festa 2013 Special
Age (Unknown)
Weight (Unknown)
Height (Unknown)
Date of Birth (Unknown)
Blood Type (Unknown)

Koro Sensei

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Koro-sensei, the main antihero of “Ansatsu Kyoushitsu: Jump Festa 2013 Special,” is portrayed as a unique and enigmatic character. As a teacher for class 3-E of Kunugigaoka Junior High School, he has a highly eccentric personality. Although he appears cheerful, friendly, and approachable, Koro-sensei harbors a deep secret and a complex agenda. Despite his impending demise, he remains dedicated to his role as a teacher, showing genuine care and concern for the welfare and education of his students.


In “Ansatsu Kyoushitsu: Jump Festa 2013 Special,” Koro-sensei is introduced as a teacher for class 3-E. He is no ordinary teacher, as he was responsible for carving out a large chunk of the moon to create a permanent crescent shape. Furthermore, Koro-sensei reveals his intention to destroy the Earth after teaching class 3-E for one year. His name, derived from “Korosenai” meaning “unkillable,” reflects his unique nature and resistance to death.


Koro-sensei’s appearance is distinctive and memorable. He takes the form of a yellow, octopus-like creature with a large smiley face on his head. His body is covered in tentacles and he has a round, bulbous shape. Koro-sensei’s design combines elements of both a typical teacher and a fantastical being, making him visually striking and instantly recognizable.


Koro-sensei possesses extraordinary abilities that set him apart from ordinary beings. As an antimatter being, he has incredible speed, agility, and regenerative powers. His tentacles can stretch and manipulate objects with precision, allowing him to perform complex tasks and defend himself against attacks. Koro-sensei is also a highly skilled tactician and strategist who uses his knowledge and experience to guide his students in their education and personal growth.


The origins of Koro-sensei are shrouded in mystery. It is revealed that he was once known as the “God of Death” and was connected to the destruction of the moon. However, it is later revealed that Koro-sensei did not personally destroy the moon, but rather an antimatter-infused rat. The details of his transformation into an antimatter creature and his purpose for teaching class 3-E are central to the plot of “Ansatsu Kyoushitsu: Jump Festa 2013 Special” and subsequent installments of the series.

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Koro-sensei – FAQ

Who is Koro-sensei in “Ansatsu Kyoushitsu: Jump Festa 2013 Special”?

Koro-sensei is the main character and the central figure in “Ansatsu Kyoushitsu: Jump Festa 2013 Special”. He is portrayed as a mysterious, octopus-like creature with a smiling face and incredible speed and agility.

What is Koro-sensei’s role in “Ansatsu Kyoushitsu: Jump Festa 2013 Special”?

In the special, Koro-sensei serves as the teacher of Class 3-E, a group of students who are given the task of assassinating him. He takes on the role of their mentor and guides them in their training to become skilled assassins.

What are Koro-sensei’s abilities and characteristics?

Koro-sensei possesses many extraordinary abilities, including superhuman speed, strength, and the ability to fly. He can change his appearance and disguise himself to blend into different environments. He also has a regenerative ability that allows him to heal wounds quickly.

What is Koro-sensei’s personality like?

Koro-sensei has a playful and mischievous personality. He often displays a jovial demeanor and enjoys teasing and challenging his students. Despite his initial appearance as a fearsome creature, he is actually kind-hearted and cares deeply for the well-being of his students.

What is the relationship between Koro-sensei and his students?

Throughout the series, Koro-sensei develops a close bond with his students. Despite their initial mission to assassinate him, he becomes a mentor and source of guidance for them. He encourages their growth, teaches them valuable life lessons, and instills in them a sense of determination and teamwork.

Does Koro-sensei have any weaknesses?

Koro-sensei has a few weaknesses that are explored in the series. One of his weaknesses is a substance called “anti-sensei material” that can harm and weaken him. He also has an ingrained fear of tentacles, which can cause him to lose focus and become disoriented.