Assassination Classroom Characters — Main Cast Guide

A tentacled, Mach-20-fast creature who destroyed most of the moon and becomes homeroom teacher of Class 3-E, whose students are tasked with assassinating him before graduation. Despite the premise, he proves to be a devoted, genuinely gifted teacher.

A quiet, perceptive student who turns out to have a natural talent for assassination — reading people, striking without hesitation, and reacting under pressure. His arc grows into questions about identity and the person he might become.

A brilliant, thrill-seeking troublemaker who treats the assassination attempts as the most fun he's had in school. His rivalry and eventual partnership with Nagisa is one of the series' central relationships.

A cheerful, popular classmate who befriends Nagisa early on and hides a much darker personal connection to Koro-sensei's origin than anyone in Class 3-E realizes.