Kazuo Kiriyama

Kiriyama is a character appearing in the 2000 japanese film Battle Royale

He is an exchange student who joined the Battle Royale program ( a game designed to have students kill each other) for his own entertainment instead of being taken forcefully. As the game begins he rapidly becomes the most dangerous and feared player. He is first seen along with the other players gathered on a clasroom on a isolated island chosen for the program. He is seen later being threatened by a group of students as they thought he was working for the program, while being threatened at gunpoint he then spits on the face of a student pointing him with an Uzi, grabs the Uzi and kills the gang, stealing all of their weapons including the Uzi, a handgun and two grenades. The next day as two female  students were making a peace call to other students through a speaker, drawing his attention, suddenly Kiriyama shoots them from behind, in a display of sadism he grabs the speaker and puts it on the mouth of one girls ( as she was still alive ) and shoots her on the stomach so everyone on the island can hear her screams. Later that night he kills a student decapitating him with a katana and steals is bulletproof vest, then he attacks a house where the movie heroes Nanahara, Noriko and Kawada ( another exchange student who was more merciful but still dangerous ) forcing Nanahara to split from Noriko and Kawada, then the tho have a brief gunfight before Nanahara is rescued by another student. The next day he engages on a gunfight with the second most dangerous player, Mitsuko Suoma, a ruthless, cold hearted girl. Kiriyama is almost defeated but manages to kill her. That Night he spots three students who were planing to blow up the central base using a makeshift bomb but they are killed, on a last moment one student named Mimura detonates the bomb, leaving him blind, he then goes outside and has his final gunfight with Kawada, who shoots him on the leg and on his bomb collar, killing him.

Personality
Kazuo is portrayed as a psychopathic, heartless killer devoid of emotion, although he displays emotion when killing other students. Also he never speaks on all course of the film and always has his face with a blank expression. He is completely willing to kill and was the only student who joined Bttle Royale for his own entertainment and was the player with the highest body count.