Monster 1 is the first monster encountered in the Karamari Hospital DLC.
Monster 1 wears a blood-soaked police officer/security guard outfit, a black necktie, and black shoes. His eyes are missing, a dark discoloration surrounds the sockets, and he lacks a mouth. His most prominent feature is his arms, which are hideously swollen from the elbows down with no visible hands or fingers.
Monster 1 appears past the sealed doorway after the power has been turned off. At first, he stands motionlessly, blocking the stairway, however, he will start to move if the player enters one of the side rooms and re-enters the main hallway.
He will slowly wander around in a seemingly random pattern and, if the player gets too close, he will slowly turn towards them.
He deals about 16 damage to the player with a cooldown of three seconds. In the HD Renovation, he deals 45 damage.
Swinging the Sword at him three times will successfully kill him. He will not respawn even if the player leaves and re-enters the room. It is possible to kill him when he's blocking the stairway.
"Bleh Wind," Monster 1's chase theme.
- When he is standing in front of the stairway, he will not damage the player even if touched.
- He and Monster 3 are the only enemies from the DLC to have animated models.
- Monster 1 is the only monster from the DLC not to be included in Endless Mode. Monster 2 was added to Endless Mode for the HD Renovation.