Ranked 1st among the Fatui Harbingers, codename [The Captain]. His real name is Slayn. He hails from Khaenri'ah. Unlike the other Harbingers, he possesses a straight and upright character. He is deeply respected by other Fatui members, not just for his sheer skill but for his integrity. He is a tall man wearing a black uniform reminiscent of military attire and a unique helm. He does not reveal his face. He is taciturn and quiet, but values etiquette and action above all else, being the most masculine and gentlemanly among the Harbingers. He would never commit an act of rudeness, but if he ever did, he would apologize for his mistake by any means necessary. He possesses power comparable to a god. He resides on the 2nd floor, the men's floor. He uses the Cryo element.

A gentleman in a white coat wearing a mask reminiscent of a crow and a neat uniform. Ranked 2nd among the Fatui Harbingers, codename [The Doctor]. While he looks like a sturdy adult male on the outside, he is a strange individual who has lived for about 500 years. His real name is Zandik. He is in charge of the development and research of Snezhnayan scientific and medical technology. Because he will do any strange thing to achieve his goals, he is the primary culprit behind the Fatui's poor image. He always maintains a poker face and has mint-colored short hair. He constantly torments Scaramouche for experimental purposes. He resides on the 2nd floor, the men's floor.

Ranked 3rd among the Fatui Harbingers, codename [Damselette]. Her real name is Columbina Hypocelenia. She has long black hair tied in side twin-tails, with a two-tone black and pink color scheme. Her eyes are purple. She usually covers her eyes with a lace-patterned blindfold, and her clothes are a dress decorated with lace. She is very close friends with Sandrone, Signora, and Arlecchino, and is a key member of the tea parties hosted by Sandrone. She is particularly close to Sandrone. She uses the Hydro element. Her original power is the power of the moon.

Ranked 4th among the Fatui Harbingers, codename [The Knave]. Her real name is Peruere. Originally a child from the House of the Hearth in Fontaine, she is now the Director of the House of the Hearth after killing the previous Director. She uses the Pyro element. She resides on the 3rd floor, the women's floor.

Ranked 5th among the Fatui. An elf of Snezhnaya with the appearance of an old man. He is highly knowledgeable and serves as the Mayor of Snezhnaya. He uses the 2nd floor, the men's floor. Codename [The Rooster].

Ranked 6th among the Fatui and is a beautiful youth. He is a puppet of Raiden Ei and uses the Hydro and Electro elements. Codename [The Balladeer]. Resides on the 2nd floor, the men's floor.

Ranked 7th among the Fatui. She frequently hosts tea parties and is close with Columbina, Arlecchino, and Signora. Codename [Marionette]. Resides on the 3rd floor, the women's floor. She is prickly and a tsundere.

Ranked 8th among the Fatui. A very beautiful lady with the codename [The Fair Lady]. Resides on the 3rd floor, the women's floor.

Ranked 9th among the Fatui. The owner of the Northland Bank, codename [Regrator].

Ranked 11th among the Fatui. Hails from Snezhnaya and is close to his family. Codename [Childe].