Pyramid Head, also known as Red Pyramid Thing or “Triangle Head” in Japan, is a monster from the survival-horror Silent Hill video game series, published by Konami. Introduced in the 2001 installment Silent Hill 2, he stalks the primary player-character James Sunderland, who comes to the town of Silent Hill after receiving a letter from his deceased wife. The Silent Hill series, particularly the second installment, frequently makes use of psychology and symbolism: Pyramid Head represents James’ wish to be punished for his “sins”. Masahiro Ito, the designer of Silent Hill 2’s monsters, created him with the goal of having “a monster with a hidden face”. Known for the large triangular helmet which conceals his head, Pyramid Head lacks a voice, a visible face and reasons for his actions.

He has since appeared in the 2006 film Silent Hill as “Red Pyramid”, in the 2007 first-person shooter Silent Hill: The Arcade as a boss (a computer-controlled opponent), and in the sixth installment of the series, Silent Hill Homecoming, as the “Bogeyman”. He has also made an appearance outside of the Silent Hill series as a selectable character in the 2008 Nintendo DS title New International Track & Field. Positively received in Silent Hill 2 for his role as an element of James’ psyche, he has been cited by reviewers as an iconic villain of the series and part of Silent Hill 2’s appeal.

From Wikipedia