As the number of characters is limited, models are created whose sole purpose is to fill up the classrooms, halls, and environment of Monster High so as to make the place more lively and realistic. These models are backgrounders, as their role is primarily to stand and walk around in the background while the characters do the story in the foreground. A few backgrounders have over time been pulled from the background and given a name or even made a fullfledged character. Even fewer others have been incorporated in the Create-A-Monster packs, namely the three-eyed girl and the pink animal girl.