Paci-Fire

Pacifier is a character in Gravity Falls, appearing in the episode "Weirdmageddon Part 1." It is an old friend of Bill Cipher and part of the Gang of Interdimensional Criminals and Nightmares. It, along with Bill and the rest of the gang, was trapped in a decaying dimension, but was finally set free when the rift between the dimensions cracked during the prophesied Weirdmageddon.

History
Pacifier has unknown criminal history.

It was prisoner of a dimension for trillion of years craving to leave it and have fun at last.

Season 2
In "Weirdmageddon Part 1" It is finally set free from its dimensional prison and stands along with the rest of the gang until the party starts.

Inside the pyramid, in the heat of the party, It can be seen dancing and drinking with the other demons, and when the Time Police crashes the party and the Time Baby is vaporized, it is worried, but the worry turns to malicious excitement as the party gets on.

Appearance
Pacifier has the appearance of a demonic dark-grey baby with thick black horns, a pink bull-nose, red eyes, and a titular red pacifier being sucked by a second face on its chest. It also has a gold cross on its massive forehead with an eye similar to Bill's at its center. Neither of his faces seem to change expression.