Edward

The main character. A shy film editor who never watches Horror films. He becomes the villain after viewing them.

Face–Heel Turn: When he starts watching the horror movies.
From Nobody to Nightmare: The movie showcases Ed's journey from a low level film editor to a spree killer.
Kubrick Stare
Large Ham: After his Face Heel Turn.
Nice Guy: Until his Face Heel Turn.
Ooh, Me Accent's Slipping: His voice actor's American accent is quite dodgy. Especially in the first act.
Sanity Slippage: Watching too many horror movies has this effect on him.
Villain Protagonist

Nick

The hero of the film who loves horror films.

The head of the Splatter and Gore Dept. He has no sympathy at all.

Nick's girlfriend

Damsel in Distress
Ooh, Me Accent's Slipping: When Ed takes her away as his hostage, her native Swedish accent is obvious when she yells "Nick! Nick!"
Same Language Dub: Averted. She's the only cast member who provides her own dubbed voice.

Edward's wife

SWAT Leader (to the SWAT Team): Are you ready to kick some ass, girls?

SWAT Team: YES, SIR! WE MUST KICK ASS, SIR!

Deep South: He has a southern accent.
Large Ham
Running Gag: He keeps complimenting on how nice things are:
Nice tie.
Nice bed.
Nice door.
Nice shot.

Some guy who Edward meets in his hallucinations who tells him to kill people because "the world needs to be corrected."