Student #11 of Class 3-E and the protagonist. He lives alone with his mother and grows his hair long at her request, often being mistaken for a girl. He usually supports assassinations but possesses a brilliant talent for killing. He shows excellent aptitude for English.

Student #7 of Class 3-E. A female student with exceptional physical abilities. She is proactive in assassination attempts.

Student #1 of Class 3-E. Excels in all subjects but is particularly gifted in Mathematics. He frequently skips class.

Class Representative #2 of Class 3-E. Excels in Social Studies.

Student #22 of Class 3-E. Close friends with Yuma Isogai.

Physical Education teacher for Kunugigaoka Junior High Class 3-E and the strongest human. His primary job is a soldier from the elite forces, a government official dispatched by the Ministry of Defense. He is faithful to his work, but he is a dense, stiff individual who only cares about the mission.

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.

Student #6 and Vice-Representative of Class 3-E. She supports Isogai, the class representative. Her academic abilities are excellent, and her physique and athletic capacity are on par with the average male, leading Karasuma to pick her as one of the girls with a high potential for assassination.

Student #4 of Class 3-E.

Student #5 of Class 3-E. Excels in Science.

Student #8 of Class 3-E. Shows exceptional talent in Japanese Literature.

Student #9 of Class 3-E.

A pretty female student who loves all living creatures.

Talented in Art.

Was a member of the baseball club.

Student #14 of Class 3-E.

Recognized for his marksmanship skills.

Has the poorest academic performance.

Shows a strong talent for English.