The Killer is the unnamed main antagonist in Scary Movie. He is later revealed to be Doofy Gilmore although he ends up being copied by Bobby Prinze and Ray Wilkins for a series of extended murders of their classmates in order to use the media from the murders to become famous. He is a parody of Ghostface.
Source: Scary Movie Wiki
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Name: The Killer, Special Officer Doofy
Origin: Scary Movie (A parody Scream and other horror films)
Classification: Serial Killer
Attack Potency: Street level (Decapitated Buffy with a cleaver in one slice)
Speed: Peak Human (Can catch teenagers in chases)
Lifting Strength: Peak Human (Easily lifted Heather out of a car by the neck)
Striking Strength: Street Class (Can stab hard enough to penetrate bodies, decapitated Buffy in one slice)
Durability: Street level
Range: Standard melee range with his knife
Standard Equipment: Hunting knife, cleaver
Intelligence: Above Average (Feigned mental disability as Special Officer Doofy to trick people into thinking he wasn't the killer)
Weaknesses: None notable.
Feats: Killed seven people in the film.