The weird and creepy creature in our fanart Assassination Classroom Korosensei Correct Answer Sticker is shown as the homeroom teacher of Class 3-E of Kunugigaoka Junior High School in Assassination Classroom anime. He claimed to be responsible for creating the permanent crescent moon and added that he planned to destroy the earth after teaching Class 3-E for a year. Before becoming a teacher, he was the assassin known as The Reaper.