Assassination Classroom Characters

A smiling, yellow, octopus-like creature who claims to have destroyed most of the Moon and promises to destroy Earth next March, unless Class 3-E can assassinate him first. In return he becomes its homeroom teacher, and he turns out to be the best teacher the class has ever had: he teaches every subject, coaches each student one to one and even trains them in assassination, while dodging their attempts at Mach 20. His face changes colour with his mood, and he loves sweets and gossip. Late in the series he reveals that he was once a human assassin known as the Reaper, changed by experiments, and that he took the class to keep a promise to its former teacher, Aguri Yukimura.

The narrator, a small, gentle student whom most people overlook, who keeps a notebook of Koro-sensei's weak points. Karasuma and Koro-sensei both see that he has the greatest natural talent for assassination in the class, because he can hide his intent until the very last moment. He uses a technique taught by the retired assassin Lovro to stop Takaoka on the island, wins the deciding duel of the paintball match for the side that wants to save Koro-sensei, and travels into space with Karma. At home he lives with a strict mother who has planned his life for him, until the two of them come to an understanding. Inspired by Koro-sensei, he decides to become a teacher, and seven years later he is training as one.

Nagisa's friend from earlier years, who arrives in Class 3-E after a suspension and becomes the first student to wound Koro-sensei, on his very first day. He is one of the most gifted students in the whole school, the only one in his class whose grades can match Gakushu Asano's, and its sharpest strategist, but he can be overconfident: Koro-sensei scolds him for losing to Gakushu in the first-term finals after barely studying. In season 2 he is the strategist of the side that wants to go on with the assassination in a paintball match against Nagisa's, loses their final duel and grows closer to Nagisa for it; he also beats Gakushu in the second-term finals. Seven years later he has a government job.

Nagisa's cheerful, pudding-loving classmate and the smallest student in Class 3-E, who names Koro-sensei on the first day and later tries to assassinate him with a giant pudding. In season 2 she reveals that it was all an act: she is Akari Yukimura, a child actress and the younger sister of Aguri Yukimura, the class's former teacher, and she joined the class with tentacles of her own, taken from her sister's lab, to avenge her sister, whom she believed Koro-sensei had killed. Koro-sensei removes the tentacles before they cost her her life, and once she learns the truth she stands with the class. After graduation she goes back to acting.

An elite agent of the Ministry of Defense who briefs Class 3-E on its mission and stays on as its P.E. teacher, training the students in the skills they need for their attempts on Koro-sensei. Strict but kind, he keeps a professional distance from the students yet protects them fiercely, and he is one of the few who notice Nagisa's talent. In season 2 he defeats the Reaper in close combat. Irina falls for him, and he is slow to notice; by the epilogue, seven years later, the two are married and he holds a senior government post.

A professional assassin of Serbian origin, hired to get close to Koro-sensei as Class 3-E's foreign-language teacher. Proud, confident and a little childish, she has no interest in teaching at first, until the class turns against her and Karasuma shows her how seriously Koro-sensei takes his job; from then on she teaches the students how to talk to people from other countries. Orphaned by a civil war as a child, she was raised by the retired assassin Lovro Brovski, who tests her and accepts her place in the class. She falls for Karasuma, is briefly won over by the Reaper and turns on the students, and comes back to them.

The biggest boy in Class 3-E and the leader of a small group with Takuya Muramatsu, Taisei Yoshida and Kirara Hazama. At first he cares nothing for the assassination and resents Koro-sensei, and Shiro uses him in a plan at the class's pool that puts his classmates in danger. Shaken, he changes: on the island he joins the hotel infiltration while hiding that he is ill himself, stops Nagisa from becoming a murderer on the hotel roof, and later calms Itona down so that Koro-sensei can remove his tentacles. Seven years later he is working for a politician.

Class 3-E's first transfer student, an artificial intelligence from Norway officially called the Autonomous Intelligence Fixed Artillery. Her constant firing during lessons makes the class tape up her guns, until Koro-sensei upgrades her and she gains a friendly personality, and the students give her the nickname Ritsu. She hides her new self from her makers to keep her promise to her classmates, and becomes their hacker, researcher and messenger, with a small version of herself on each of their phones. Seven years later she roams the internet freely, still helping her old class when it needs her.

The second transfer student, a quiet boy brought in by the white-cloaked Shiro, who claims to be Koro-sensei's younger brother and has tentacles growing from his hair. He loses his first match against Koro-sensei and is taken away, and in season 2 the tentacles become too much for him. The class learns that his parents' electronics company went bankrupt; Terasaka's group gets through to him, Koro-sensei safely removes the tentacles, and Itona joins Class 3-E for good, where he becomes its machinery and electronics expert and builds a remote-controlled tank. Seven years later he has taken over his family's business.

The son of chairman Gakuho Asano, top student at Kunugigaoka, leader of Class 3-A's Big Five and president of the student council. Clever and proud, he looks down on Class 3-E and keeps challenging it: a bet on the first-term finals, a pole-toppling match at the sports festival, a race for profits at the school festival. His real rival is his father, and when Gakuho drives Class 3-A to breaking point before the second-term finals, Gakushu asks Class 3-E to beat it fairly. Karma is the one student who can match his grades. At graduation he and the Big Five shield Class 3-E from the press.

The chairman of Kunugigaoka Junior High School and Gakushu's father, who designed the system that keeps Class 3-E at the bottom so that the other students work harder to avoid ending up there. Calm and ruthless, he slips last-minute questions into exams, takes over the baseball club as its coach to beat Class 3-E and finally teaches Class 3-A himself. Years earlier he ran a small cram school as a kind, caring teacher, and the death of one of his first students turned him into the man he is now. Koro-sensei, whose teaching is based on Gakuho's old ideals, finally gets through to him. Once the public learns about Class 3-E, he is removed from his post.

A scientist who first appears as Shiro, a man hidden under a white cloak, as Itona's guardian, and who later takes an interest in Kaede. He is revealed to be Kotaro Yanagisawa, who ran the experiments that turned the human Reaper into Koro-sensei and who was engaged to Aguri Yukimura. A test of his tentacle research on a lab rat is what really blew up most of the Moon. He blames Koro-sensei for ruining his research and his pride, and returns for the final battle with tentacles of his own and the second Reaper at his side.