Slappy the Dummy is a fictional character and antagonist in the Goosebumps children's series by R. L. Stine. He is one of the series' most popular villains and the main antagonist of the Night of the Living Dummy saga and a major villain in later series. He is also the main antagonist of the Goosebumps movie and its sequel. According to R.L. Stine in Goosebumps, Slappy is a "ventriloquist's dummy with a serious Napoleonic complex" that comes alive by these words: "Karru Marri Odonna Loma Molanu Karrano" (which roughly translates to "You and I are one now"), and they can be found on a sheet of paper in Slappy's jacket pocket. After coming to life, Slappy will try to make the person who brought him back to life serve him as a slave, to the point that he will frame that person for things that he does.
His personality can be described as a dangerous prankster, who loves to have fun terrorizing anyone who comes across him and trying to make them his slave.