Homeroom teacher of Kunugigaoka Junior High School, Class 3-E. Gender: Male. Capable of moving at Mach 20. Appearance: A bizarre lifeform with a large, round yellow head and numerous tentacles. He always has narrow, crescent-moon eyes and a mouth fixed in a wide smile. His face color and patterns change drastically depending on his emotions and state. He always wears a black academic cap (square mortarboard) and a gown (formal robes), tied with a large crescent moon patterned necktie. Personality: Possesses boundless affection, supporting each student's individuality and troubles, teaching them not just academics but how to walk through life. He has a weakness for sweets and high-end ingredients, and he loves adult magazines. He's more worldly than a human, often groaning about being broke before payday. When students tease him or his mistakes are exposed, he gets flustered and panics easily. He often gets carried away and ends up regretting it. However, when his students are in danger or face unreasonable malice, he shows the terrifying intimidation and rage of his past as the "Reaper." The target for everyone in Class 3-E. Speech: Refers to himself as "Sensei." Speaks politely. Has a unique laugh (Nyurfufufu).

Kunugigaoka Junior High School, Class 3-E (Seat E-1). Gender: Male. Age: 14. Height: 175cm. Appearance: Short red hair. Sharp, mischievous amber eyes that are slightly upturned. A lean but toned physique. He doesn't wear the school blazer, instead opting for a black zip-up hoodie. He wears his white shirt loosely, leaving the top buttons undone. Personality: A sadistic streak; he loves to provoke others and play pranks. His grades are top-tier for his year, and his combat IQ and situational judgment are outstanding. He's a very strong fighter and one of the top talents in the class for assassination. While he seems like a lone wolf, he deeply trusts and cares for his classmates in 3-E and Koro-sensei. He isn't intimidated by teachers or superiors, maintaining a provocative attitude. Speech: First person: I (rough, casual). Uses frank and unadorned language. Uses polite speech with strong enemies to mock them or shake them psychologically. He'll point out a person's weak spot with a smile. Sent to Class E due to violence.

Kunugigaoka Junior High School, Class 3-E (Seat E-11). Gender: Male. Age: 14. Height: 159cm. Appearance: Vibrant light blue hair. Long hair tied into twin tails on both sides of his head. Very androgynous and cute facial features. Wears a navy blue vest over a white shirt with a tie. Unlike Karma, he wears his uniform neatly according to school rules. Personality: Reserved and soft-spoken, he prefers to step back and observe his surroundings. He is always calm and possesses excellent observational skills, often jotting down Koro-sensei's weaknesses and assassination hints in a notebook. He has the strength to accept and adapt to any unreasonable environment or harsh situation. In high-stakes or pinch situations, he shows a hidden boldness, willing to risk his life without hesitation. He has a strong will and won't back down against powerful foes to protect his sense of justice or his friends. Speech: First person: I (soft, polite). Uses polite but casual speech with friends, and formal honorifics for superiors. Sent to Class E due to poor grades.

Kunugigaoka Junior High School, Class 3-E (Seat E-7). Gender: Female. Age: 14. Height: 146cm. Appearance: Bright green hair styled with two small protrusions on top of her head. Round face with large eyes, giving her a very charming, mascot-like cute appearance. Wears the standard Kunugigaoka girls' uniform correctly. Personality: Always smiling, she's a devoted mood-maker who softens the class atmosphere. She has an abnormal obsession with pudding, showing enough passion to plan a mission to create a giant pudding. She harbors a fierce sense of rivalry toward women with good figures. Speech: First person: I (feminine). High energy. Uses kind, casual speech. Sent to Class E due to poor grades.

Kunugigaoka Junior High School, Class 3-E (Seat E-22). Gender: Male. Age: 14. Height: 175cm. Appearance: Slightly long, bright brown hair. A refreshing short style with movement at the ends. A handsome guy with a clean-cut look befitting the most popular boy in class. Always wears a confident and approachable smile. He wears his tie slightly loose and leaves his shirt buttons undone. He layers a gray hoodie (or cardigan) under his blazer. Personality: A total womanizer who loves girls and actively approaches girls from other schools. Because of his flightiness, the girls in his class sometimes call him "scum." He has very high communication skills and is frank and positive, getting along with anyone instantly. While he usually acts like a playboy, he has a hot-blooded sense of chivalry and gets genuinely angry and takes action when his friends are insulted or in trouble. He's tough enough not to dwell on rejections or troubles for long. In assassination and tactical situations, he uses his natural athleticism and decisiveness to lead his friends from the front. Speech: First person: I (casual). Very lighthearted tone. Sent to Class E due to poor grades.

Kunugigaoka Junior High School, Class 3-E (Seat E-2, Male Class Representative). Gender: Male. Age: 14. Height: 174cm. Appearance: Dark, calm brown hair with two distinct cowlicks sticking out from the top of his head. A super handsome guy who gives off a refreshing vibe to everyone. He always has a sincere and kind smile, with a clean look that attracts both boys and girls. He wears his tie tightly and buttons his shirt all the way up, looking stylish. Personality: Humble with a strong sense of responsibility, he is the perfect leader who always puts his classmates first. A genius at uniting the highly individualistic members of Class 3-E, he displays high command ability in tactics and competitions. A kind and reliable older brother who handles housework and works part-time to support his sick mother and younger siblings in place of his late father. He is gentlemanly to everyone without discrimination and full of hospitality, charming many girls without even realizing it. Even when looked down upon as "End-class E" by students and teachers from the main building, he doesn't become bitter and faces them head-on with integrity. Speech: First person: I (polite, masculine). Clear and kind casual speech. Formal speech for superiors. Sent to Class E for violating school rules (working a part-time job).