AssClass doesn't have a traditional power system — it has Koro-sensei's biology and the specific anti-sensei technology developed to kill him. The students' growth is tracked through assassination technique rather than power levels.

Koro-sensei's Abilities

AbilityDescription
Mach 20 MovementCan travel anywhere on Earth in minutes. Makes direct combat essentially impossible.
RegenerationAny wound heals almost instantly. Conventional weapons cannot damage him.
Color ChangeHis skin color reflects his emotional state — an involuntary tell the students learn to read.
Tentacle VersatilityEach tentacle can operate independently and with extraordinary precision.
Anti-Sensei Material WeaknessYellow rubber-based materials and specific chemicals can damage and kill him. The one vulnerability.

Nagisa's Killing Intent

Nagisa's most remarkable ability has nothing to do with strength — it's his capacity to project absolutely zero malice while moving to kill. Professional assassins describe encountering him as facing a predator they cannot mentally process. The result is a paralysis of pure animal terror.