Blue

Blue is the first enemy introduced, and takes the form of a large humanoid wearing a crown. He wanders around the map searching for players, indicated by his stomping and chuckling. He will chase down any players that are not hidden inside a locker or a box.

Blue acts much differently in the final night, chasing down players who pop a balloon in the area. He directly chases down any remaining players after a balloon lands on a fork in a cutscene, following them into the vents of the facility. After the players escape, Blue is crushed by a falling door, which he proceeds to pull himself out of and back inside.

Strategy: If blue sees you, run away from his line of sight, then box. If he sees you boxing up, a red "!" will appear above your head and he will chase after the box you're in and eat you. If a red "!" appears, immediately unbox and run away to a more hidden spot then box. If you're feeling confident and no other friends are nearby, you could just run away and he'll stop chasing you eventually. If you hear his footsteps while about to go to a different room, box up before you do, then take a peak, if he's there, stay boxed, if he's not, unbox then do what you need to do in the room you went to.

Speed (when he spots somebody): Slower than your walking speed, Slightly slower than your crouching speed, faster than your boxed speed