The Lipstick-Face Demon - Joseph Bishara
Insidious has its fair share of scary demons. The Lipstick-Face Demon, or The Man With Fire on His Face, is featured throughout many of the movies. Joseph Bishara's character is a combination of special FX makeup and CGI work.
The Red Queen - Helena Bonham Carter
The Red Queen is probably one of the most stressful villains out there. She's eccentric, unhinged, and bloodthirsty. Helena Bonham Carter brought the queen to life and the CGI brought her to another reality. Carter's enlarged head (done in post-production) is even more horrifying.