The Anatomy Doll is a particular ghost that is characterized by its half and half look.
Like the name suggests, the Anatomy Doll has the right half of its face and body covered in muscles that would be used to show the different types. Likewise, on the left side, there appears to be 'skin', but with an open chest displaying all the different organs. The head also reveals one half of the brain.
While it seems this ghost has no control over the eye painted on the 'skin', it can move the one that is connected with the muscles.
In Episode 2, Hajime kicks over a broom and shatters the doll. It is believed to be unaffected much, however, as one of the hands run off.
The Anatomy Doll could probably be found in the Science room, and although it will pursue targets, it is unknown if anything will happen as when Hajime and Satsuki were being chased, it didn't move any limbs.
The Anatomy Doll appears to be in the end credits.