The haunted mask

Apperance:The Haunted Mask is portrayed rather faithfully to this description, retaining greenish skin, a huge heavy brow line, a flat nose wrinkled into a harsh grimace, deformed ears, and a mouth with long thin fangs, that is able to move during speech. As it becomes a real face, a change in appearance is apparent; the skin moistens, and its own black eye color replaces the wearers.

The film's brief appearance retains much of the show's, adding a few features. It further exaggerates the wrinkly grimace with a deeply furrowed brow and crow's feet. The head is larger in proportion and more bulbous, further disconnecting it in appearance from the wearer's own body as a noticeably foreign object. It also adds prominent veins in the forehead, making it appear more fearfully lifelike. whoever wears the mask appears to have black eyes instead of their normal color. The Haunted Mask is a living mask intent on possessing its user, and the main antagonist in the books The Haunted Mask, The Scream of the Haunted Mask, and Goosebumps Wanted: The Haunted Mask.
Personality
The Haunted Mask feeds off the evil and fear around it, always ready to cause more mayhem when able, and is at its most powerful during Halloween. It amplifies the wearer's negative emotions and can eventually even take full control of them. As such, the only way to remove the Haunted Mask is by a symbol of love or an act of kindness, which would loosen its control over its wearer enough to be removed. The Mask seems to favor Carly Beth over any other wearer.

The Unloved are a collection of twelve hideous, living masks who desire to possess their wearer, passing on their characteristics onto them. They appear throughout the The Haunted Mask saga.The Shopkeeper tells Carly Beth Caldwell that the masks in the back room are in fact actual faces that he made in a lab. The faces used to be beautiful and alive, but they became ugly as soon as they left the lab. He calls them The Unloved because nobody wants to see them. Sometimes people take the masks, and the masks find "a new home". The masks fuse onto their wearers faces and stay there unless they are removed by a symbol of love.