Kinpatsu Sakamochi

nihongo|Kinpatsu Sakamochi|坂持金発|"Sakamochi Kinpatsu" is a villain character in the novel "Battle Royale". He is a government employee who has never had anything to do with the class and the administrator of the Battle Royale Program.

Sakamochi is a vile and sadistic man who has a few of the children's parents who raise a fuss about their children being put on the program killed (it is not specified whose parents, although the same thing happened to Shogo Kawada's father the previous year) and rapes Ms. Ryoko Anno, the caretaker of Shuya Nanahara and Yoshitoki Kuninobu. He also likes watching the class die and makes the announcements of dead students. He likes to say things like "I'm proud of you all!" He also seems to be involved in bets over who will win the game (his money is on Kazuo Kiriyama).

On the boat back to the mainland Sakamochi talks to Shogo Kawada (knowing that Kawada has tricked the system and that Shuya Nanahara and Noriko Nakagawa are still alive). During the conversation Shogo asks him if he had children to which he responds that he has two already, with a third on the way. Because Sakamochi enjoys sexual intercourse, as the text states, "I like to have a good time". His partner (presumably his wife; it is not specified if he is married or not) will be having their third child soon. Sakamochi also admits he used his connections to get his eldest child, a daughter in the second grade, into a prestigious school. Sakamochi claims to have taught his children to be willing to die in the Battle Royale Program.

He is described as having long shoulder length hair and wearing worn out clothes, also he is described as being fairly short.

Sakamochi mentions that he knows a soldier named Kato (加藤 "Katō").

In the end, Shogo Kawada fatally stabs Sakamochi in the neck with a pencil.

In the film version, the teacher is slightly different than in the novel and manga; he is called Kitano and is played by Takeshi Kitano (but credited as "Beat Takeshi"). The manga uses a character similar to Sakamochi named Yonemi Kamon.

Kinpatsu Sakamochi's name is a pun on Kinpachi Sakamoto, the name of the dedicated teacher in the drama series "Kinpachi-sensei".