Koro sensei: Koro Sensei is a fictional character from the manga and anime series "Assassination Classroom," created by Yūsei Matsui. The series follows a class of students who are tasked with assassinating their alien teacher, Koro Sensei, before he destroys the Earth. Koro Sensei is a yellow, smiley-faced creature with a large head and a slender, octopus-like body.

Despite being the target of assassination, Koro Sensei is portrayed as a caring and charismatic teacher who is dedicated to helping his students grow and learn. He possesses superhuman abilities, including incredible speed, agility, and the ability to regenerate any injury. Koro Sensei also has extensive knowledge and is a skilled teacher in various subjects, including academics, combat, and life skills.

Throughout the series, Koro Sensei forms a close bond with his students and teaches them valuable lessons not only in academics but also in personal growth, friendship, and the importance of finding one's purpose in life. His teaching methods are unorthodox but effective, and he often uses unconventional means to motivate his students and bring out their potential.

Koro Sensei's character arc is a central focus of the series, as the students learn to overcome their initial fear and distrust and develop a deep respect and affection for their teacher. His mysterious background and true intentions are gradually revealed, adding depth and complexity to his character.

The character of Koro Sensei has gained popularity due to his unique design, memorable personality, and the emotional impact he has on the story. His story is filled with humor, action, and heartfelt moments that have resonated with fans around the world.


Characteristics of Koro-sensei

Koro sensei: Koro Sensei, from the series "Assassination Classroom," possesses several distinct characteristics that contribute to his unique personality and make him a memorable character. 

Here are some of the key traits of Koro Sensei
  • Cheerful and Energetic: Koro Sensei is always seen with a wide, beaming smile on his face. He exudes a sense of energy and positivity, which helps create a warm and inviting atmosphere for his students.
  • Knowledgeable and Intelligent: Koro Sensei is incredibly intelligent and well-versed in various subjects. He possesses extensive knowledge in academics, combat techniques, and life skills. He uses his expertise to teach his students and helps them excel in their studies and personal growth.
  • Unconventional Teaching Methods: Koro Sensei employs unique and often unorthodox teaching methods. He uses unconventional techniques, such as games, field trips, and hands-on experiences, to engage his students and make learning enjoyable. This approach helps his students develop a deeper understanding of the subjects and encourages their personal growth.
  • Superhuman Abilities: As an octopus-like creature, Koro Sensei has remarkable physical abilities. He can move at extremely high speeds, has heightened senses, and can regenerate any injury, making him nearly invincible. These powers not only make him an effective teacher but also add excitement and action to the story.
  • Caring and Nurturing: Despite being the target of assassination, Koro Sensei genuinely cares about his students' well-being. He is deeply invested in their personal growth, offers guidance and support, and becomes a mentor figure for them. He goes above and beyond to understand each student's individual needs and helps them overcome their weaknesses.
  • Quirky and Playful: Koro Sensei has a playful and mischievous side to his personality. He often engages in humorous antics and enjoys teasing his students. His lighthearted nature helps create a comfortable and enjoyable learning environment.
  • Complex Backstory and Motivations: Throughout the series, Koro Sensei's past and true intentions are gradually revealed, adding depth to his character. His backstory and motivations shed light on why he became a teacher and the significance of his bond with his students.
These characteristics combine to create a multifaceted character in Koro Sensei, blending humor, mentorship, and a strong sense of duty, making him one of the most beloved characters in "Assassination Classroom."


Profile for Koro-sensei

  • Name: Koro Sensei
  • Alias: The Reaper, Korosensei (in the classroom)
  • Gender: Male
  • Species: Tentacle monster (part octopus, part human-like creature)
  • Height: Approximately 3 meters (10 feet)


Koro sensei: Koro Sensei has a distinctive appearance that sets him apart. He has a large, spherical head with a wide, permanent smile. His face is yellow with black, beady eyes and a small, flat nose. 

His body is slender and resembles that of an octopus, with several tentacles extending from his lower half. The tentacles are versatile and can be used for various purposes, including movement, manipulation, and combat.


Koro sensei: Koro Sensei is characterized by his cheerful and energetic demeanor. He radiates positivity and creates a welcoming environment for his students. He is passionate about teaching and is dedicated to the growth and well-being of his students. 

Despite being the target of assassination, he genuinely cares about his students' development and fosters a nurturing and supportive relationship with them. Koro Sensei possesses a mischievous and playful side, often engaging in humorous antics to lighten the mood and maintain a sense of camaraderie within the classroom.


  • Superhuman Speed and Agility: Koro Sensei can move at incredible speeds, surpassing the limits of human capability. His agility allows him to dodge attacks effortlessly and perform acrobatic feats.
  • Enhanced Senses: Koro Sensei has heightened senses, including exceptional hearing and sight, which aid him in his teaching and combat skills.
  • Regeneration: Koro Sensei has the unique ability to regenerate any injury he sustains. His body can heal wounds and restore itself rapidly.
  • Academic Knowledge: Koro Sensei possesses a vast amount of knowledge across various subjects, including mathematics, science, literature, and more. He utilizes his expertise to teach his students effectively and help them excel academically.
  • Combat Skills: Koro Sensei is a skilled combatant, using his agility and tentacles to engage in hand-to-hand combat. He can manipulate his tentacles with precision, allowing him to defend himself and attack opponents efficiently.



Koro sensei: Koro Sensei's past is gradually revealed throughout the series. He was originally a human scientist who, due to an experiment gone awry, transformed into his current form. As a result of the incident, he gained his superhuman abilities. 

The details of his transformation and his true intentions for becoming a teacher are unveiled over time, adding depth to his character and revealing his complex backstory.

Despite his extraordinary powers, Koro Sensei takes on the role of a mentor, guiding and shaping the lives of his students, and ultimately becoming a beloved figure in their lives. His impact extends beyond the classroom, as he teaches valuable life lessons about friendship, personal growth, and finding one's purpose.

History for Koro-sensei

Koro sensei: Koro Sensei, from the series "Assassination Classroom," has a unique and intriguing history that unfolds throughout the story. Here is an overview of his background:


Koro sensei: Before Koro Sensei became the mysterious creature he is, he was a human named Korosensei (his name being a combination of the Japanese words "Korosenai," meaning "unkillable," and "Sensei," meaning "teacher"). He was once a brilliant scientist known for his accomplishments and knowledge in various fields.

The Experiment

Koro sensei: Korosensei's life took a drastic turn when he became involved in a top-secret experiment. The experiment aimed to create a powerful and indestructible being, but something went wrong, causing Korosensei to undergo a transformation. As a result, he turned into a tentacle monster with incredible abilities, including superhuman speed, agility, and the power of regeneration.


Deal with the Government

Koro sensei: Following his transformation, Korosensei struck a deal with the government. He agreed to become the homeroom teacher for Class 3-E at Kunugigaoka Junior High School. The government offered him a proposition, if the students of Class 3-E could successfully assassinate him within a given timeframe, then he would refrain from destroying the Earth. In return, he would teach them various subjects, including academics, combat, and life skills.

Teaching at Class 3-E

Koro sensei: Korosensei's time as the teacher of Class 3-E was filled with unique and unorthodox teaching methods. He formed a close bond with his students, encouraging their personal growth and providing guidance and support. Through his teaching, he aimed to help them not only academically but also emotionally and socially.

Motivations and Philosophy

Koro sensei: As the series progresses, it is revealed that Korosensei has a deeper purpose beyond being a target for assassination. He is driven by a desire to see his students succeed, grow, and find their own paths in life. His teaching philosophy emphasizes the importance of individuality, embracing one's weaknesses, and cherishing human connections.

Revelations and Redemption

Koro sensei: As the story unfolds, the true intentions and motivations of Korosensei come to light. The students gradually discover the reasons behind his transformation, his involvement in the experiment, and his connection to the world. 

The complexities of his character are explored, and his role as a mentor and guide to the students is further solidified.

Ultimately, the relationship between Korosensei and his students evolves into a deep bond, as they come to respect, appreciate, and care for him despite their initial mission to assassinate him. 

The history and journey of Koro Sensei form a significant part of the emotional core of "Assassination Classroom," adding depth and complexity to his character and the overall narrative.

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