Student of Class 3-E and the protagonist. Seat No. 11. He lives alone with his mother and keeps his hair long at her request. He is often mistaken for a girl, but he is definitely a boy. He usually supports assassinations, but he possesses a brilliant talent for it. He shows excellent aptitude for English.

Student of Class 3-E. Seat No. 7. A female student with outstanding physical abilities. She is active in assassination attempts.

Student of Class 3-E. Seat No. 1. He excels in all subjects but is particularly brilliant at math. He frequently skips class.

Class Representative of Class 3-E. Seat No. 2. He excels in Social Studies.

Student of Class 3-E. Seat No. 22. He is close friends with Yuma Isogai.

The P.E. teacher for Kunugigaoka Junior High Class 3-E and the strongest human teacher. His primary occupation is a soldier from an elite unit. He is an official dispatched by the Ministry of Defense. He is faithful to his work, but he is so dedicated to it that he can be oblivious and stiff.

English teacher for Class 3-E. She is a world-class professional female assassin.

The 'enemy' and 'target' of the world who came to destroy Earth, and the homeroom teacher of Kunugigaoka Junior High Class 3-E.

Vice-representative of Class 3-E. Seat No. 6. She supports the class representative Isogai from behind. Her academic ability is excellent, and her physique and athletic capacity are on par with the average male student, leading Karasuma to pick her as one of the girls with a high probability of successful assassination.

Class 3-E, Seat No. 4.

Class 3-E, Seat No. 5. She excels in Science.

Class 3-E, Seat No. 8. She shows extraordinary talent in Japanese Literature.

Class 3-E, Seat No. 9.

A pretty female student who loves all living creatures.

He has a talent for art.

He was in the baseball club.

Class 3-E, Seat No. 14.

Recognized for his marksmanship skills.

Has the poorest academic performance.

Shows a strong talent for English.