What horror movie character begins with the letter I?

There are a few possibilities depending on how specific you want to be:

* It (from the Stephen King novel and movie adaptation) - A shapeshifting, child-eating entity.

* Isaac Chroner (from the movie "The Wicker Man") - A creepy, cult leader.

Let me know if you have any other details about the character in mind, and I can try to narrow it down!