Tobi

Tobi, A.K.A. The Thing That Thrives On Fear, Asmodeus, or simply The Demon is the central Malevolent Entity occupying the residence of Katie and Micah in Paranormal Activity, the residence of Kristi Rey, her husband Daniel, adoptive daughter Ali and infant son Hunter in Paranormal Activity 2 and the residences of mother Julie along with Katie and Kristi as children whom are her daughters and her husband Dennis and the residence of Grandmother Lois in Paranormal Activity 3.

He is not the only entity inhabiting the residence of Julie, Dennis and Kristi and Katie in 1988 but the only entity inhabiting the residence of Katie and Micah in Pasadena California in 2006 as well as the residence of Kristi, Husband Daniel, Adoptive daughter Ali and baby son Hunter in 2006.

It briefly comes to the resident of secret witch Louise whom is the mother of Julie and grandmother of Kristi and Katie in Carlsbad, California.