Gregory

Gregory or The White Eyed Goatman is the first monster you encounter in It Lurks chapter one

Gregory is also encountered in chapter 4 (It Lurks) when you run out of time when looking for the generators.

Gregory also appears in They Lurk Chapter 5.

Lore Related
Currently not much is known about Gregory in the lore. But it has been speculated that possibly Gregory and Terence are twins or related since they have the same model but behave differently and have different eye colors.

This is possible as it has been said that the monsters are transformed humans or animals.

AI Mechanics
Gregory's AI in chapter 1 is, he just walks to your torso. That's it,,

In chapter 4 he will instantly spawn and kill you if you are outside of a locker when the time runs out.

In They Lurk chapter 5 he will randomly go to a point in the map, I am unsure but I think that when you pull the lever his AI will go straight for the lever since it knows you would be there, this information is not confirmed by anyone but from my experience he always has gone to the lever when I pull it. will update this part in the future. It is said by Crow himself that Gregory can walk through walls, but we have yet to see that in game yet.

"mr greg can walk through walls" - Crow