Short answers, pulled from the story.
Designer Masahiro Ito created the video game character Pyramid Head in Silent Hill 2. Ito designed the figure to possess no visible humanity and to serve as a physical manifestation of psychological burden rather than a simple enemy.
The true nature of Pyramid Head in the 2001 game Silent Hill 2 is a personalized executioner designed solely for the protagonist James Sunderland. He appeared as the embodiment of James's wish to be punished for killing his wife Mary to end her suffering from a terminal illness.
Pyramid Head wields a massive, heavy blade known as the Great Knife in the 2001 survival horror game Silent Hill 2. This weapon was originally one half of a pair of scissors that Masahiro Ito planned to complete but could not implement due to time constraints.
The 2006 film adaptation of Silent Hill changed the character Pyramid Head by having actor Roberto Campanella wear a basin-like structure instead of the perfect triangle helmet. Director Christophe Gans interpreted the figure as one of the executioners from the town's history rather than a specific manifestation of James's psyche.
Pyramid Head appears under the moniker Bogeyman in the 2008 game Silent Hill: Homecoming. This version served as a non-interactive figure who executed the father of the new protagonist Alex Shepherd.
The video game character Pyramid Head was added to Dead by Daylight as a purchasable killer titled The Executioner in 2020. This inclusion further solidified his status as a cultural icon within the survival horror genre.