Pyramid Head is a guest character from Silent Hill who is a violent demon whose goal is to punish and execute those who have a strong guilt or overwhelming desire for punishment.
He first appeared in Silent Hill 2 as the main antagonist who tries to kill the survivors, but fails to kill them, as they successfully escape his reign of terror. For many years, he not only slaughtered humans who had a strong guilt, but has also tortured and murdered some of the demonic creatures that inhabit Silent Hill. Many times, later on in the series, he has been attempting to kill the survivors who try to escape Silent Hill.
Pyramid Head's standard weapon is a gigantic machete called the Great Knife which he uses to slaughter his opponents.
Pyramid Head's secondary weapon is a long spear which he uses to mercilessly stab his opponents.
Pyramid head is somewhat muscular with a pyramid-like torture device attached to his head (which marks the sign of torture and death to his enemies), but despite this appearance, he is extremely strong and can do serious damage to his opponents. He also wears a butcher's smock and limps slowly (possibly due to how heavy his Great Knife is), but walks normally when carrying the Spear.
Pyramid Head grabs his enemy by the neck, slams his/her body into the ground three times senselessly, picks him/her back up, lifts up his Great Knife, and brutally slashes the enemy, and throws the enemy murderously into the ground again, and then ends the opponent by stomping him/her in the face once, finishing the "Overkill" move.
For everything, Pyramid Head does not speak and is completely silent.