Kosika is the fourteen-year-old child queen of White London. A powerful Antari who formerly survived as a street thief, she struggles to assert her authority and restore magic to her starving city. She relies on ritualistic bloodletting to feed the land, dealing with a court filled with older guards who frequently underestimate her.

Tesali is a fifteen-year-old magic worker hiding in Red London. She possesses a rare ability to see and manipulate the threads of magic, a talent that makes her a target for exploitation. Having fled an abusive family, she isolates herself, trusting only her animated owl skeleton and a few acquaintances while trying to avoid the political conflicts of the city.

Kell is an Antari magician and the adopted prince of Red London. Following a catastrophic magical battle years prior, he lost the ability to use his magic without suffering agonizing pain. He travels the seas with his partner, learning to fight without magic while trying to rediscover his sense of identity and purpose.

Lila is a fiercely independent Antari and the captain of the ship Grey Barron. Missing one eye from a childhood trauma, she is a deadly fighter who values her freedom above all else. She actively supports her partner through his struggles while working as an informant for the Arnesian crown.

Rhy is the king of Arnes, known as the Unkillable King due to a magical tether connecting his life to his brother's. Born without magic, he faces political unrest and assassination attempts from a rebel group known as the Hand. He strives to be a compassionate leader, often risking his own safety to protect his guards and family.

Nadiya is the queen of Arnes and a highly skilled inventor. She prefers the solitude of her workshop to courtly duties, creating powerful magical devices that sometimes alarm her family. She maintains a practical, non-romantic marriage with the king, viewing their unique family structure as a strength.

Alucard is the king's consort and a powerful magician who controls three elements. A former privateer, he now uses his skills to protect the royal family from shadows and assassins. He carries physical scars from past battles and emotional wounds from his abusive upbringing, finding healing in the family he has chosen.

Berras is Alucard's estranged older brother and an earth magician who relies on brute force. Raised in an abusive household, he internalized his father's cruelty and views leadership strictly through the lens of domination. He resents his brother's position at court and harbors dangerous ambitions against the crown.

Holland is the former king of White London who sacrificed himself to restore magic to his world. He now appears as an invisible ghost to Kosika, offering her advice and guidance on how to rule their struggling city.

Maris is the captain of the Ferase Stras, a legendary floating market ship that deals in powerful magical goods. She is deeply protective of her crew and willing to use forbidden magic to keep them alive after an attack.

Bex is a ruthless and cynical criminal working for the shadowy organization known as the Hand. She pursues a stolen magical device primarily for the paycheck, showing little interest in the group's ideological goals.

Calin is a scarred mercenary hired by the Hand to recover a dangerous magical artifact. He frequently bickers with his partner Bex while trying to track down the young girl who fled with their prize.

Ezril is the young, newly appointed aven essen, or high priestess, of Red London. She offers blunt and somewhat cynical advice to the king, standing out from her predecessors with her striking beauty and sharp demeanor.

Lark is a young guard in White London and Kosika's only true friend. Having survived the streets together as child thieves, he attempts to maintain their personal connection despite her elevation to the throne.

Nero is a charming young con artist in Red London who operates on the fringes of society. He secretly possesses forbidden bone magic and maintains a rare friendship with Tesali.

Ren is the young princess of Arnes, raised collectively by Rhy, Nadiya, and Alucard. She loves animals and serves as a bright spot of domestic joy for her three parents amid the political turmoil.

Serak is a member of the Vir, the elite guard of White London. He is fiercely devoted to the legacy of the former king and serves as a stern protector and advisor to Kosika.

Ciara is the owner of the Silken Thread, a pleasure garden in Red London. She operates as an informant for Alucard, trading in secrets while carefully protecting her own interests.

Valick is Maris Patrol's nephew and a crewmate aboard the Ferase Stras. He is gravely wounded during a robbery, prompting his aunt to take desperate measures to save him.

Katros is a crew member on the Ferase Stras and Maris Patrol's nephew. He assists his aunt in the immediate aftermath of a violent robbery aboard their vessel.

Tieren was the former aven essen of Red London. Though he is deceased during the events of the novel, his compassionate wisdom continues to guide Rhy and Kell in their darkest moments.

Serival is Tesali's older sister who works as a finder for their father's antiquities business. She is manipulative and eager to exploit her youngest sister's magical gifts for the family's profit.

Nasi is a servant in the White London palace. She cares for Kosika and tries to help the young queen navigate the political complexities of ruling a difficult court.

Ned is a tavern owner in the magicless Grey London. Despite living in a drab world, he possesses a faint trace of magic and kindly shelters a severely injured traveler from another dimension.