Lipstick-Face Demon

The Lipstick-Face Demon AKA the Fire-face Demon, also known as the Red-faced demon or "The man with fire on his face", is the main antagonist of Insidious.

In the first film, it was the closest Insidious entity in the Further to capturing Dalton's physical body. The demon lives inside a large, demonic-decorated lair behind a blood-red door in the Lambert's attic.

Insidious
During Lorraine's story, the Demon appears behind Josh and roars menacingly, frightening her. It later ran to Dalton's room and ransacked it completely.

Josh volunteers to enter the Further to rescue his son Dalton, who is found chained to the floor. As the Demon sharpens his claws while listening to Tiny Tim's Tiptoe Through the Tulips from a bronze phonograph, Josh releases Dalton, but the Demon senses Josh's presence and chases the two; however, Josh succeeds and returns him to his body in the material world. The demon is not seen again throughout the rest of the film.

Appearance
The Red-face Demon has a muscular texture, but is completely black-skinned, except for the red lipstick drawn on his face. He is half-bald, has dark and coarse fur on his legs, and has dark hoofs and a tail. He also has long, sharp, spider-like claws at the end of his fingers.

Though the Demon never speaks in the film, it is capable of speaking, as Lorraine mentions that in a dream she spoke to it and it responded to her in words. When asked who it was, it responded that it was a visitor. When asked what it wants, it responded that it wanted Dalton. Lorraine claimed she could still hear its voice, implying that the Demon has a chilling voice. His voice is only heard once in the film and that is when Renai hears whispering coming from the baby monitior, it is assumed that this is the Demon whispering because he keeps saying I want it, referring to Dalton's empty body.

The Demon keeps Dalton close by in his home in the Further, which seems to be a theatre-like chamber; inside it has marionettes which it likes to play with. It also seems to enjoy sharpening its nails; the Demon hurts Dalton whenever he makes noise.

Trivia

 * The Demon is often commented through bearing a strong resemblance to the Sith apprentice Darth Maul from the science-fiction series "Star Wars." This is most likely due to the red markings on both their faces and their blackened skin.
 * The Demon makes a crackling sound whenever he is going to appear/seen in the movie, making his appearance very obvious. This explains why most people suspect that it was him behind Alison in the end of Insidious Chapter 2.
 * In the Demon's spare time he likes to enjoy his favourite hobbies: puppeteering and sharpening his claws.