Pierro

Gender: Male
Titles: The Jester, Director of the Fatui, The First Fatuus
Regions: Snezhnaya, Khaenri'ah
Affiliations: Fatui, Eleven Fatui Harbingers, Eclipse Dynasty (formerly)

Pierro, also known by his codename "The Jester", is the Director of the Fatui and the very first member as well as Harbinger of the organization.

(Source: Genshin Impact Wiki)