God of Death

"It's impossible for humans to reap the God of Death. Do not fear, there is only the God of Death reaping man."

- God of Death

Summary
God of Death was the final antagonist of the Assassination Classroom series, he was the discipline of Koro-Sensei.

History
After he saw his father being killed, he admired the assassination and decided to become an assassin, he was trained by an unknown assassin for several years, when the training was complete, he betrayed the latter during an assassination mission.

He later reappears with the mission of killing Koro-Sensei and his students, however he was defeated by Karasuma.

After that, he was found by Shiro, which revealed him the identity of Koro-Sensei and asked him to join with him for the fulfilment of his final plan. The assassin accepted, Shiro then transformed him into a tentacle monster for the final battle against Korosensei.

During the final battle he overpowered the latter and nearly killed Kaede Kayano, causing Korosensei to release an energy beam towards him, which destroyed half of his body and allowed the former teacher to finish him with a stab to the chest.

Appearance
While disguised, he has a short grey hair and normally wears his hat. In reality withouth his mask, he has a skinless red skull face.

Personality
During the series, he showed to be arrogant, egoistical and sadistic towards his preys.