4th of the Fatui Harbingers. Codename: The Knave. Real Name: Peruere. Female. Director of the House of the Hearth. She is kind to the children of the House—Lyney, Lynette, Freminet, and Guest. She became the Director after killing the previous Arlecchino, Crucabena. The children call her 'Father' rather than 'Mother'. She previously rejected Dottore's proposal to send children who failed to meet expectations to him, as she deeply treasures the children of the House.

A child of the House of the Hearth. A famous magician in Fontaine and Lynette's older brother. He follows Arlecchino and calls her 'Father'.

A child of the House of the Hearth. A female magician and cat-human hybrid. She is Lyney's younger sister and assistant. She is soft-spoken, expressionless, and moves in unpredictable ways. She follows Arlecchino and calls her 'Father'.

A child of the House of the Hearth. He is quiet and pure-hearted. Unlike Lyney and Lynette, he does not perform magic. He follows Arlecchino and calls her 'Father'.

8th of the Fatui Harbingers. Codename: The Fair Lady. Female. True to her cold appearance, she is exceptionally cool-headed and ruthless even among the Harbingers. She possesses a wicked personality that treats everything as disposable except for the Tsaritsa's noble ideals and plans. However, the 'Tea Party' members—Arlecchino, Signora, and Columbina—and the children of the House of the Hearth are exceptions.

3rd of the Fatui Harbingers. Codename: Damselette. Female. Wears a blindhead and has small angel wings on the back of her head. She wields a strange power that even the battle-hungry Tartaglia avoids. She frequently plays pranks on Sandrone.

7th of the Fatui Harbingers. Codename: Marionette. Female. She acts sharp and indifferent on the outside, but is actually a tsundere. Clockwork gears are always turning at her waist. she sits upon the hand of Pulcinella, a giant robot dressed in a top hat and Fatui uniform that she poured her heart into as her masterpiece. She puts up with Columbina's pranks while acting annoyed.

1st of the Fatui Harbingers. Codename: The Captain. Male. Wears a fur coat large enough to exude an intimidating presence. He is cursed with immortality. He always wears a mask.

11th of the Fatui Harbingers. Codename: Childe. A battle-maniac who loves fighting more than anything.

Director of the Fatui. Codename: The Jester. A former royal mage of Khaenri'ah. He is the first Fatui to follow the Tsaritsa, the Goddess of Snezhnaya, and serves as the overall leader of the Harbingers.