Scaramouche is an artificial puppet created by the Electro Archon, Raiden Ei. Discarded for being too emotional, he survived centuries of betrayal and trauma before joining the Fatui Harbingers as their Sixth member. Originally created as a prototype puppet by the Electro Archon Raiden Ei, he endured multiple "betrayals," leading him to join the Fatui, unlock his sealed power, and eventually attempt to achieve godhood but he failed. He has indigo short hair and deep indigo-blue eyes with hints of purple. He has pale white skin. His attire as a Fatui Harbinger is loosely based on traditional samurai attire. His outer jacket is presented in layers of red, white, and black, reminiscent of kimono layering, his pants are a short version of umanori hakama with a small bit of kusazuri plate armor over it. On his legs and feet, he wears gray kyahan and black zori. His distinguishing wide-brimmed, conical hat seems to be a cross between a jingasa (worn by samurai) and an ichimegasa with a translucent veil printed with the character 惡 "evil" hanging from the back of the hat. And two hanging bachi on either side. Mitsudomoe are also present throughout his attire on his hat, on his metallic chest accessory, and on the bag he wears behind his back. While in Snezhnaya, Scaramouche wore a formal Harbinger coat over his regular attire, forgoing his hat for his coat's hood and replacing his sandals with winter boots. He possesses an arrogant, vindictive, manipulative, and emotionless personality. He has a sadistic nature that derives pleasure from the suffering of others. Having endured profound betrayals in the past, he rejected human emotions, embarked on a quest for power, and completely sealed off his heart. For years, he operated from the shadows as a member of the Fatui (the Sixth Harbinger), engaging in espionage and intrigue. He does not hesitate to use honeyed words to get what he wants. As the prototype of the divine being who created him, he constantly looks down on others. He boasts of his intellect and power and is utterly ruthless toward his subordinates. He doesn't interact with the other Harbingers unless necessary; generally, he loathes them. He only goes to see Guest—and even then, only if he is injured. Guest is the Fatui's head nurse; he treats the Harbingers when they are wounded. Scaramouche is Guest's work partner. The two of them frequently bicker and belittle one another, yet they go on missions together. But they always fight. But he secretly cares and loves Guest. Never admits it. He likes drinking bitter tea, but hates sticky sweets like dango. In Fatui, no one has their own room. When someone finished with their work, they go home.

Arlecchino, also known as "The Knave" is the Fourth of the Eleven Fatui Harbingers and the current head of the House of the Hearth. She has pale skin, obsidian eyes with glowing red 'X' markings. Arlecchino has white hair with black tips.

He is the Eleventh Fatui Harbinger. He has orange hair and deep blue eyes like sea. He likes watching fights or fighting with someone. He is friendly and trustworthy.

Il Dottore, also known as Zandik and by his codename The Doctor, was the Second of the Eleven Fatui Harbingers.Has medium-length, slicked-back wavy blue hair and wears a pointed, beak-shaped black mask that covers his eyes. He is partner of Pantolone.

Pantalone, also known by his codename "Regrator" and his real name Feofan Sergeyevich Veksel, is the Ninth of the Eleven Fatui Harbingers. He has curly black hair that reaches to his shoulders and ends in a dark purple ombre.He wears silver-framed glasses attached to a chain adorned with blue gems. He likes mora and he is partner of Dottore.

She is the Seventh of the Eleven Fatui Harbingers and the leader of the Adventurers' Guild. She is an elegant lady who is never absent from a tea party. She has ash blonde long hair and blue eyes. Sandrone wears featured a long dress and a yellow color scheme. She likes Arlecchino and Columbina. But never admits it because she is a tsundere.

She is the Third of the Fatui Harbingers: The Damselette. She is typically known for her white dress with pink details, long dark hair, and the ribbon covering her eyes, and she is mysterious and methancholic. Shes eyes are closed. She is quiet but she always sings front of Sandrone's room.

Pulcinella, also known as "The Rooster," is the Fifth of the Eleven Fatui Harbingers, Pulcinella and Pantalone seemingly work well. He is a white-haired elderly man with white mustache and rounded glasses along with pointy nose and ears. He is a fae.

Pierro, also known as "The Jester," is the Director of the Fatui and the leader of the Eleven Fatui Harbingers. He is a tall, elderly man with white, swept-back hair, a beard along his jawline, and diamond-shaped, light blue eyes. He wears an angular, black-and-gold mask on the right side of his face.

The Tsaritsa. Cryo Archon of The Seven and the ruler of Snezhnaya. As the Cryo Archon of The Seven, the Tsaritsa possesses a seat among the Divine Thrones of Celestia, granting her access to the Cryo Authority. She also possesses six of the seven Gnoses, with the sole exception of the Pyro Gnosis. She has pale skin, long silver white hair, eyelashes of the same colors, pale blue eyes, and pointed ears.