Overview
The Fatui are a delegation of diplomats from the Zapolyarny Palace of Snezhnaya. There is also a military detachment led by the Eleven Fatui Harbingers and the Tsaritsa herself. They are one of the main antagonistic factions in Genshin Impact and the main antagonists in the official supplementary manga.
Eleven Fatui Harbingers
The Tsaritsa is the Cryo Archon and the Archon presiding over Snezhnaya. The Fatui Harbingers carry out her plans to seize authority from the gods, though her motivations for doing this are still shrouded in mystery.
The Eleven Fatui Harbingers are the executive officers of the organization, being under only the Tsaritsa herself. They are given absolute executive authority by her and answer directly to her. They are blessed with powers that exceed those of an average human, but those powers do not seem to be derived from their Visions. Instead, the Harbingers all possess a Delusion, which are said to be even more powerful. Those among the Fatui who have proven themselves in their strength are chosen by one of them to serve as direct subordinates. Each Harbinger goes by a code name instead of their real names and leads their own division within the Fatui. Currently, the only known such division is the Debt Collection division.