IGN has published a guide to the most notable ghosts and demons from the Insidious horror film franchise, timed to the release of its sixth instalment, Insidious: Out of the Further. The new film introduces Gemma, a character able to permanently bring demons into the real world, and reunites several previously seen spirits alongside series regular Elise Rainier, positioning the sequel as a kind of "all-star" reunion of the franchise's scariest creations.

The guide profiles entities including Doll Girl, who re-enacts a family murder and returns after a 15-year absence from the screen, and the Lipstick-Face Demon, the series' most recognisable villain, associated with young Dalton Lambert and played by the franchise's composer, Joseph Bishara. It also covers the Long-Haired Fiend, an ominous secondary threat from the first two films, noting that the series typically gives little backstory on its ghosts' origins or motivations.