In Silent Hill, a Pyramid Head is the demonized spirit of the executioners of the Silent Hill Jail. They carry giant knives or spears while wearing a giant, metal Pyramid-shaped helmet. They're under the control of Samael the dark god. They were sent to Silent Hill to torture all those who got in their way. Pyramid Heads are extremely proud demons: they won't accept defeat - they will first commit suicide before dying under your hand.
Pyramid Head was designed by Masahiro Ito and first appeared in the 2001 Silent Hill 2 videogame where he serves as one of the main antagonists.
Major Story Arcs
Silent Hill 2
James Sunderland first encounters a Pyramid Head in the Wood Side Apartments. James hears a horrified shriek and finds himself emanating an obscure, reddish aura standing behind a wall of bars which separates the two. The monster does not seem to notice James, but the creature's presence causes James' radio to emit static.
Pyramid Head is then seen again by James in Room 307. Pyramid Head appears to be in a sexual act with two mannequin monsters. Pyramid Head lets go of the two monsters and they appear to die. Pyramid Head then moves closer to the closet in which James is hiding in while dragging one of the mannequin monster behind him. Pyramid head stops moving when the mannequin monster he is dragging thrashes about and "dies" again.
Silent Hill: Origins
Pyramid Head appears in the prequel in a painting.
Silent Hill: Homecoming
Pyramid Head appears as the Bogeyman in a few scenes and in one ending.
Silent Hill: Downpour
Pyramid Head appears in the surprise ending.