

Korosensei
殺せんせー
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Personal Description | |
Nihongo | 殺せんせー |
Vital Information | |
Gender | Alien Male |
Weight | Est. 300kg |
Status | Deceased (manga/anime) |
Height | 3m |
Family | Unknown |
Occupation | Homeroom Teacher of Class 3-E |
Affiliation | Kunugigaoka Junior High School |
First Appearance | |
Manga Debut | Chapter 1 |
Anime Debut | Episode 1 |
Japanese Voice | Jun Fukuyama (Anime and 3Ds Game) |
English Voice | Sonny Strait (Funimation) |
- Series:Assassination Classroom
- Role: Homeroom Teacher of Class 3-E, Kunugigaoka Junior High School
- Aliases: “The Reaper” (former identity)
Émile Durkheim
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Born |
David Émile Durkheim
15 April 1858 Épinal, France
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Died | 15 November 1917(aged 59)
Paris,France
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Nationality | French |
Alma mater | École Normale Supérieure |
Known for | Sacred–profane dichotomy Collective consciousness Social fact Social integration Anomie Collective effervescence |
Scientific career | |
Fields | Philosophy, sociology, education, anthropology, religious studies |
Institutions | University of Paris, University of Bordeaux |
Influences | Immanuel Kant, René Descartes,Plato, Herbert Spencer,Aristotle, Montesquieu, Jean-Jacques Rousseau, Auguste Comte. William James, John Dewey, Fustel de Coulanges, Jean-Marie Guyau, Charles Bernard Renouvier, John Stuart Mill |
Influenced | Marcel Mauss,Claude Lévi-Strauss, Talcott Parsons, Maurice Halbwachs, Jonathan Haidt, Lucien Lévy-Bruhl,Bronisław Malinowski, Fernand Braudel, Pierre Bourdieu, Charles Taylor, Henri Bergson, Emmanuel Levinas, Steven Lukes, Alfred Radcliffe-Brown, E. E. Evans-Pritchard, Mary Douglas, Paul Fauconnet, Robert N. Bellah, Ziya Gökalp, David Bloor, Randall Collins, Neil Smelser[1] |
Personality and Characteristics
Korosensei is an unorthodox teacher with an eccentric, humorous, and compassionate personality. Despite his monstrous appearance and intentions to destroy Earth, he is deeply dedicated to his role as a teacher, determined to inspire and uplift his students. He possesses a keen understanding of each student’s individual needs, helping them grow academically, emotionally, and personally. While he appears mischievous and even dangerous at times, he values his students above all else, and his lessons often incorporate essential life skills.

With his signature wide, joyful grin, Korosensei exudes warmth and humor, reminding his students that even the most powerful teacher has a playful side.
Appearance
Korosensei is an octopus-like being with a large, round head and a permanently cheerful face, which changes colors to reflect his emotions. His appearance, complete with numerous tentacles and bright yellow skin, makes him a visually striking and memorable figure. He typically wears a graduation cap and a long black teacher’s robe with yellow accents, signifying his role as the head of Class 3-E.
Abilities
Before becoming a teacher, Korosensei was an infamous assassin known as “The Reaper,” feared for his lethal skills and cold-hearted nature. His transformation into his current form came after an experiment conducted by a research facility. His decision to become a teacher stemmed from his promise to a former colleague, who believed he had the potential to inspire and change lives. This promise led him to Kunugigaoka Junior High’s Class 3-E, where he dedicated his last year to teaching and guiding his students.
Backstory
Before becoming a teacher, Korosensei was an infamous assassin known as “The Reaper,” feared for his lethal skills and cold-hearted nature. His transformation into his current form came after an experiment conducted by a research facility. His decision to become a teacher stemmed from his promise to a former colleague, who believed he had the potential to inspire and change lives. This promise led him to Kunugigaoka Junior High’s Class 3-E, where he dedicated his last year to teaching and guiding his students.
Role in the Story
Korosensei arrives at Kunugigaoka Junior High as the new teacher for Class 3-E, a group of underachieving students relegated to the school’s lowest status. He announces his intent to destroy Earth by the end of the school year but gives his students a chance to prevent this by assassinating him. Through the series, Korosensei helps each student overcome their struggles, using unconventional teaching methods that integrate the assassination attempts as lessons in creativity, determination, and growth.
Relationships
Class 3-E Students
Korosensei cares deeply for each student, using personalized lessons to bring out their strengths and helping them overcome their self-doubt and struggles.
Nagisa Shiota
Among his students, Korosensei has a close bond with Nagisa, recognizing his unique potential as an assassin and supporting him with specific guidance.
Tadaomi Karasuma and Irina Jelavic
As colleagues, Korosensei shares a friendly rivalry with Karasuma and an amusingly flirtatious dynamic with Irina, creating a distinct camaraderie.
Trivia and Insights
- Name Meaning: “Korosensei” is a combination of “korosenai” (meaning “unkillable”) and “sensei” (meaning “teacher”), referencing his resilience and role as a mentor.
- Color-Coding Emotions: Korosensei’s face changes colors based on his mood, serving as a humorous visual cue for his emotions, such as yellow for his normal state and red for anger.
- Moon Incident: Korosensei is responsible for the permanent crescent shape of the moon, which he created during an experiment that led to his transformation.
Legacy and Impact
Korosensei’s legacy lies in the lives of his students, who grow immensely under his guidance and carry forward his teachings. He teaches them not only academics but also the importance of resilience, self-confidence, and integrity. His influence shapes Class 3-E into stronger individuals, leaving a lasting impact that goes beyond the classroom.