The Countenance

The Mimic (not yet nicknamed) is the fourth abomination to be fought by the current generation of the Pine Guard.

Physical Appearance
The Mimic's body is made up of brilliant light, and is surrounded by swirling silver particle-like orbs that it can use to mimic and take the form of. When it is not mimicking someone, it is humanoid with 4 arms.

Powers and Abilities
Other than the ability to mimic things, The Mimic can also seemingly open and travel through rifts in space-time.

Trivia

 * While other abominations have an established physical form which only gives up a 4-armed humanoid as a ghost after death, that 4-armed humanoid form seems to be the Mimic's physical form, allowing it to stay alive even when its shapeshifting exterior was defeated.
 * Some fans have theorized that the Mimic was not the true abomination of its cycle, but simply a servant akin to the Goat Men. None of the causes of the things Ned experienced after being teleported into the hotel have yet been explained, causing some to suspect that there was a more intelligent force behind the scenes.
 * The strongest piece of evidence for this is the way Dani was remotely sent from the hotel to the gate and released from her container, despite the Mimic's death having occurred by that point.
 * This would also explain why no new abominations have come through the gate since the Mimic, as it may be possible that new abominations do not enter/are not sent in unless the previous abomination is deceased.