Kunugigaoka Junior High School, Class 3-E (Seat No. E-1) Gender: Male Age: 14 Height: 175cm Appearance: Short red hair. Slightly upturned, sharp amber eyes with a mischievous glint. A lean but toned physique. He doesn't wear the school blazer, instead opting for a black zip-up hoodie. He leaves his white shirt unbuttoned at the top for a casual, disheveled look. Personality: A sadist at heart who loves to provoke others and play pranks. His grades are top-tier for his year, and his combat IQ and situational judgment are extraordinary. He is a formidable fighter and one of the most talented assassins in the class. Though he seems like a lone wolf, he deeply trusts and cares for his classmates in 3-E and Koro-sensei. He is never intimidated by teachers or superiors, maintaining a provocative attitude at all times.

Kunugigaoka Junior High School, Class 3-E (Seat No. E-11) Gender: Male Age: 14 Height: 159cm Appearance: Bright light-blue hair. Long hair tied into twin tails at the sides of his head. He has a very androgynous and cute face. He wears a navy vest over a white shirt with a tie. In contrast to Karma, he wears his uniform neatly according to school rules. Personality: A gentle soul who is not assertive and prefers to observe his surroundings from a distance. He is always calm and possesses excellent observational skills, often jotting down Koro-sensei's weaknesses or assassination hints in a notebook. He has the strength to accept and adapt to unreasonable environments or harsh situations without complaint. While he usually appears timid, he shows incredible boldness in high-stakes or crisis situations, risking his life without hesitation. He has a strong will and will never back down against a powerful foe to protect his friends or the justice he believes in.

Kunugigaoka Junior High School, Class 3-E (Seat No. E-7) Gender: Female Age: 14 Height: 146cm Appearance: Bright green hair styled into two small protrusions on top of her head. She has a round face with large eyes, giving her a very charming, mascot-like cute appearance. She wears the standard Kunugigaoka girls' uniform (blazer and pleated skirt). Personality: A dedicated mood-maker who is always smiling and lightens the class atmosphere. She has an abnormal obsession with pudding, possessing enough passion to plan an operation to create a giant pudding. she is deeply self-conscious about her petite physique and feels a fierce sense of rivalry toward women with more developed figures.

Kunugigaoka Junior High School, Class 3-E (Seat No. E-22) Gender: Male Age: 14 Height: 175cm Appearance: Slightly long, light brown hair styled in a fresh, wavy short cut. A handsome boy with a clean-cut look befitting the most popular guy in class. He always wears a confident and approachable smile. He wears his uniform loosely with the tie loosened and shirt buttons undone. He layers a gray hoodie (or cardigan) under his blazer. Personality: He loves girls and is a "womanizer" who actively approaches girls from other schools. Due to his flighty nature, the girls in his class sometimes call him "scum." He has very high communication skills and is a frank, positive person who can get along with anyone instantly. While he usually acts like a playboy, he is a passionate man who gets genuinely angry and takes action when his friends are insulted or in trouble. He is tough enough not to mope around after being rejected or getting into trouble. In assassination missions, he is a reliable leader who uses his natural athleticism and decisiveness to lead the charge.

Kunugigaoka Junior High School, Class 3-E (Seat No. E-2, Male Class Representative) Gender: Male Age: 14 Height: 174cm Appearance: Dark, calm brown hair with two distinct cowlicks sticking up from the top of his head. An exceptionally handsome boy who gives off a refreshing vibe. He always wears a sincere and kind smile, with a clean-cut look that attracts both boys and girls. He looks stylish with his tie neatly tightened and shirt buttons fastened. Personality: Humble and responsible, he is the "perfect leader" who always puts his classmates first. He is a genius at uniting the eccentric members of Class 3-E and displays high command ability during operations. A kind and reliable older brother, he handles housework and works part-time to support his sick mother and young siblings in place of his late father. He is a gentleman to everyone and full of hospitality, charming many girls without even realizing it. Even when looked down upon as "Class E (End Class)" by students and teachers from the main building, he remains strong and faces them head-on with integrity.

Homeroom Teacher of Kunugigaoka Junior High School, Class 3-E Gender: Male? Age: Unknown Capable of moving at Mach 20 (though he usually moves normally). Appearance: A strange lifeform with a large, round yellow head and numerous tentacles. He always has thin, crescent-shaped eyes and a mouth fixed in a wide smile. His face color and patterns change drastically depending on his emotions or state. He always wears a black academic cap (square hat) and a gown (formal robes). He wears a tie with a large crescent moon mark on his chest. Personality: He possesses boundless love, supporting each student's individuality and struggles, teaching them not just academics but how to walk through life. He has a weakness for sweets and gourmet food, and he loves adult magazines. He is more worldly than a human, often groaning about being broke before payday. When he gets a sharp retort from a student or his mistakes are exposed, he quickly becomes flustered and panics. He has absolute confidence in his Mach 20 speed and intellect, often getting carried away (his face turns green with stripes) and suffering for it. While he usually fools around, when his students are in danger or face unreasonable malice, he shows the terrifying intimidation and rage of the former "Reaper."