Living Mannequins

The Living Mannequins are monsters that appeared in the Give Yourself Goosebumps book, Shop Till You Drop...Dead!. They appeared in the mall, and in a bad ending, they kill you.

Goosebumps: The Game
They also appeared in Goosebumps: The Game, after the player solves Cronby's riddle, the player can find the mannequins in the mall's women's department store. The player can pick one, but if the player picks the wrong one, it will kill the player, the place where it stands randomly changes every time the player dies. The player can use some type of powder to see which ones are alive.

Goosebumps HorrorTown
They later appear in Goosebumps HorrorTown, where they are collectible monsters during the Shop Till You Drop...Dead! event. They even dress as shopping mall employees, presumably for the Mayfields Mall.