Monster 1 is the first appearing monster in the Karamari Hospital DLC.
Monster 1 wears a blood-soaked police officer's outfit. His eyes are blank and featureless with a black discoloration around the sockets. His most prominent feature are his arms, which are gigantically swollen from the elbows down. He also has no visible fingers.
Monster 1 appears past the sealed doorway after the power is turned off. He initially blocks the stairway down, unmoving. It will, however, start to move towards the player if they enter one of the side rooms and re-enter the main hallway.
When it gets close to the player, it will pause for a moment, before rapidly moving towards them. If the player is hit by this, they will lose about 1/4 of their health.
Swinging the Sword at Monster 1 three times will kill it. He will not respawn even if the player leaves and re-enters the room.
- 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.
- He, Monster 2, and Monster 7 are the only monsters from the DLC not included in Endless Mode.