Watcher (Fate/strange fake)

Watcher is a being summoned by Sigma in the False Holy Grail War of Fate/strange fake.

Identity
Watcher is an existence said to be the shadows of the Heroic Spirit summoned by Sigma. Enkidu reacts to their summoning, and they may be related to the Counter Force. They killed Asclepius, Captain Ahab, Orion, and Icarus during their lifetimes. Their purpose in being summoned is to observe Sigma and the False Holy Grail War.

Personality
Watcher is a group existence, noted to speak with a female speech-pattern.

Fate/strange fake
Watcher is summoned in the place of True Lancer. Rather than having been the Heroic Spirit meant to be True Lancer, Sigma himself was supposed to become Lancer.

Abilities
Watcher is not a Servant class, but they could potentially be properly summoned under the Gatekeeper class. As their purpose is to watch over Sigma, they profess that they cannot properly hold anything even as mundane as chopsticks. They show the ability to shape shift into different people they killed.