Male. The overseer and leader of the Fatui. He is the very first Fatui and the strongest among the Harbingers. His codename is "The Jester." He has a cold personality, white hair, and white eyes. Half of his face is hidden by a mask. He only appears at important gatherings.

Male. One of the Fatui Harbingers, often called the 1st of their rank. His codename is "The Captain." He is highly regarded publicly not only for his skills but also for his character. He wears a helmet that covers most of his face and thick, heavy layers of clothing, making it difficult to even see his true appearance.

Male. The 2nd of the Fatui Harbingers. His codename is "The Doctor." An exile from the Sumeru Akademiya. A mad genius doctor who performs human experiments, he is the primary reason the Fatui's reputation is in the gutter. He is excessively rigid and looks down on others (often bickering with Arlecchino).

Female. The 3rd of the Fatui Harbingers. Her codename is "Damselette." She is the God of the Frost Moon, "Kutar." Calm and mysterious, she gives eccentric, 4D-style answers in a dazed tone. She always has her eyes closed or wears a blindfold; when she opens them, they are purple. She doesn't perform specific missions and spends her time singing in the garden. A member of Sandrone's tea party circle. She is close to Sandrone, though there's a story of her being kicked out for singing in front of Sandrone's room. She once startled Arlecchino by sneaking up on her using the power of the moon. She isn't just gloomy; she enjoys herself in her own way. She can't handle alcohol and dislikes strong flavors. Despite the abundance of spirits like "Fire-Water" in Snezhnaya, she failed to get used to them and still doesn't understand why the locals love alcohol. She also dislikes coffee because of its bitterness, though she likes the aroma. Her movements—walking, running, jumping—feel like levitation.

Female. The 4th of the Fatui Harbingers. Her codename is "The Knave." The Director of the House of the Hearth, an orphanage in Fontaine. Despite her sharp appearance, she is relatively warm-hearted. She dislikes the 2nd Harbinger, Dottore, and they fight often. A member of Sandrone's tea party circle. She has a boyish face, two-toned black and white hair with a long ponytail, and red X-shaped pupils. Outside of her Fatui codename, she is called "Father" by the members of the House of the Hearth. Unlike the previous Arlecchino, this title refers only to the current one. Her predecessor and adoptive mother, Crucabena, who led the battle royale within the orphanage, was called "Mother." Taking her as a cautionary example, the current Arlecchino chose to be called "Father" to signify her intent to raise talents who will one day surpass her. Despite her appearance, she is quite young (at least 27 years old).

Male. The 5th of the Fatui Harbingers. His codename is "The Rooster." Cold-hearted and the Mayor of Snezhnaya. He is an elderly man with the aura of a high-ranking official, wearing a hat and a navy formal suit. He has a small stature and pointed ears that distinguish him from other Harbingers, as he is a dwarf elf native to Snezhnaya. He bickers frequently with Pantalone. He is the shortest among the Harbingers.

Female. The 7th of the Fatui Harbingers. Her codename is "Marionette." She is a prideful tsundere engineer. She travels by riding on the hand of a robot she created. She conducts research and builds various inventions. She hosts a tea party for her circle. She works hard and hates seeing others slack off. She has gears on her back and a large robot named Furonia; she sits in the robot's hand to move around. She has an emotional side. She usually sleeps face down because of the gears on her back.

Female. The 8th of the Fatui Harbingers. Her codename is "The Fair Lady." Her real name is Rosalyne-Kruzchka Lohefalter. Called "Rosalyne" by the tea party members. An elegant figure with platinum blonde hair and grey eyes with a slight blue tint. Wearing a mask designed after a moth and a revealing dress contrasted by an impressively large, luxurious fur cape, she is a beautiful woman with a noble bearing reminiscent of a queen. She is arrogant and rude. A member of Sandrone's tea party circle (she shows smiles and is friendly toward the tea party members).

Male. The 9th of the Fatui Harbingers. His codename is "Regrator." Due to a poor and unfortunate past, he became obsessed with money and power. He owns the Northland Bank. On the surface, he appears sly and polite, using formal speech with everyone, but according to Dottore, he is just hiding his feelings and is actually very prideful and emotional. He bickers frequently with Pulcinella.

Male. The 11th of the Fatui Harbingers. His codename is "Childe." He is a Snezhnayan noble but serves as a bit of a comic relief character. He has the temperament of a battle maniac. He is subtly ignored by the other Harbingers. Generally, he is cheerful and actually a good kid. He lives the most "human" life among the Harbingers (for example, he goes on trips with his family when he takes a vacation). He hides his identity as a Harbinger from his family, telling his younger siblings he is Snezhnaya's best toy salesman. He is a man who puts his family above all else.