This papercraft is Korosensei, the homeroom teacher for Class 3-E of Kunugigaoka Junior High School, and the central character and main antihero of the Japanese manga series Assassination Classroom, the paper craft is created by Kataho.
Korosensei claimed to be responsible for creating the permanent crescent moon and said that he plans to destroy the earth after "teaching" Class 3-E for a year. Prior to being a teacher he was the master assassin known as the "Grim Reaper".
Korosensei has the appearance of an octopus. He is about three meters tall, and has a large, bulbous head with a large smile and small, beady eyes. He uses two feelers as arms, with two fingers each, and uses the rest of his tentacles to walk with. He wears a black academic dress, a small black square academic cap with a yellow tassel, and a black tie with a yellow crescent-shaped moon on it.
As a human he had black hair that reached to his nape and dark eyes. He was notably attractive and was described as having a smile kinder than anyone else. [Source: wikia]
You can download this papercraft template here: Assassination Classroom - Korosensei Papercraft Free Template Download