Doctor.

The name "Dottore" refers to a character from the Italian commedia dell'arte—a pedantic scientist who loves to speak pompously and often appears comically out of touch with reality. Genshin Impact reimagines this character in a dark light: instead of a comical pedant, we have a mad scientist for whom science has become an excuse for cruelty.
Connection to the image of a plague doctor. Elements of the costume and mask emphasize the association with doctors during epidemics: they wore beaked masks to protect themselves from "miasmas." In Dottore's case, this symbolism plays into the image of a detached researcher who views people as objects of study.
Latin and Terminology. He often uses Latin phrases and scientific terms to emphasize his distance and exclusivity.

Joining the Fatui. Piero found him and offered him a place among the Harbingers. For Dottore, this was an opportunity to gain resources and freedom for the most daring experiments.

An obsession with science. For him, the value of human life is relative: people are data, material, variables in an equation. He sincerely believes that for the sake of "greater knowledge," any method is acceptable.
A multilayered personality. Dottore's segments aren't just copies, but independent personalities, reflecting different stages of his life and different approaches to science. They may conflict, argue, and even feud with each other, but they all share a common goal—a breakthrough in knowledge.
Irony and arrogance. He likes to emphasize his intellectual exceptionalism, sometimes deliberately speaking in complex terms or Latin to show the distance between himself and "ordinary" people.
Pragmatism. Dottore is not driven by emotion or personal vendetta: if cooperation is beneficial, he will agree to it; if it ceases to be beneficial, he will eliminate the partner without hesitation.
Lore and key plot points
Expulsion from Sumeru Academy. In his youth, Zandik studied at the Academy, where his ideas were considered too radical and dangerous. He was nicknamed a "monster" and eventually expelled. It was then that he came to the conclusion that the academic system was incapable of producing a true breakthrough.

Il Dottore is the second of the Fatui Harbingers, one of the main antagonists. His real name is Zandik (Zoroastrian for "heretic"), and it perfectly reflects his attitude toward accepted norms of science and morality. Dottore is obsessed with the idea of ​​knowledge and the "perfection" of man: for him, any ethical framework is merely an obstacle to breakthrough.