Murder Monkeys

The Monkeys are a group of demonic monsters that serve as the primary antagonists of the first chapter of Dark Deception, a horror maze-style game - fittingly enough said chapter is named "Monkey Business" and the Monkeys have become the game's more infamous enemies online due to this chapter being released as a teaser for the game proper (with other chapters still to be released).

Monkey Business
The Monkeys are a strange race of demonic creatures inhabiting one of many pocket-dimensions connected to Bierce's Ballroom, which the player must enter as part of a task to create a mystical ring via collecting the soul shards of previous victims, who have failed the elaborate mazes which make up said dimensions.

The Monkeys' dimension resembles a grand hotel but the hallways are haunted by said Monkeys, who possess knives, sharp claws and speed - the Monkeys will attack any they come across in said halls and pursue them mercilessly with the intent of killing them.

What's worse is that the halls are also covered in the soul shards of those who failed, this suggests the Monkeys' victims do not just physically die but are also held as eternal prisoners in the hell-like dimension (this is likely the case for all the dimensions in the game, however).

The Monkeys are revealed to have a connection to the arch-demon Malak, near the end of the chapter and go into a frenzy when the player collects all the soul shards - yet are unable to pursue the player once they exit the dimension.

Appearances
The Monkeys are vaguely humanoid primates in the style of puppets or toys, dressed in hotel uniforms and carrying knives - their demonic nature is betrayed by their mouths - which are filled with razor-sharp fangs, as well as their bulging bloodshot eyes.

Personalities
All four of the Monkeys shown in the game are vicious, relentless predators who will pursue any they come across in the hallways and continually track them down until they have killed them - they will also become more and more furious the further a player progresses, showing that they value the souls they have trapped in the dimension and will go to any lengths to keep said souls trapped their for eternity.