Mr. Scratch (Alan Wake)

Continuing the story of Alan Wake, a mysterious doppleganger of the author manifests, calling himself Mr. Scratch. This demonic entity serves as the main antagonist of Alan Wake's American Nightmare.

Aspects
Mr. Scratch is the spitting image of Alan Wake himself and takes advantage of that. In his first recording, Mr. Scratch describes himself as being like Alan but far more "open". In many of the recordings, Mr. Scratch demonstrates his sociopathy by brutally torturing and killing several unfortunate victims, all while either taunting or cryptically speaking to Alan (who is thought to be dead). He speaks of how he'll even go as far as deceiving Alan's wife Alice until the eventual day to kill her.

He also prefers quiet and is shown to murder those who are too loud for his tastes, such as the party-goers in the recording (offscreen).

American Nightmare
In the story, Mr. Scratch gets ahead of Alan searching for something and resulting in those Alan encounters to initially suspect he is Scratch. At the Motel, Mr. Scratch manifests as the Darkness and kills the mechanic Emma Sloan when she refuses to heed Alan's advice about remaining in the light. At the Observatory, Dr. Meadows tells Alan that Mr. Scratch had appeared seeking out information regarding an unusual phenomenon in the sky and its signal but didn't understand the reading. He also murdered and tortured individuals at the motel for when their party got out of hand. Throughout the game, he leaves Alan multiple recordings via old television sets.

At the Drive-In, Mr. Scratch manifests and summons a horde of Taken, taunting Alan by questioning if he'll be the hero to save the day. He disappears after Alan defeats the Taken, leaving another recording in his wake (showing him dancing to a song with "Psycho" as its lyrics). Serena Valdivia, a curator at the Drive-In, is influenced by Scratch and the Darkness, but is saved by Alan's efforts. She reveals that Mr. Scratch intends to make it so the sun never rises again, keeping the world in eternal night. The incomplete signal from the Observatory is one of the pages with which Alan can restore reality and stop Mr. Scratch. Unfortunately, the incomplete page doesn't affect Mr. Scratch who merely sends Alan back in time.