Nathaniel is a 12-year-old apprentice magician whose birth name was erased when his parents gave him to the government at age five. He is highly intelligent and fiercely ambitious. He harbors a deep resentment for those who underestimate him, reading magical texts far beyond his required curriculum. His intense social isolation leads him to orchestrate a dangerous plot for revenge against a master magician who publicly humiliated him.

Bartimaeus is a 5,010-year-old djinni who has served historical figures like King Solomon and Ptolemy over millennia. Lacking a fixed physical form, he relies on his essence and shape-shifting abilities, often appearing as animals or a favorite Egyptian boy. He is sarcastic and witty. He remains profoundly resentful of his perpetual enslavement to magicians, constantly plotting ways to outwit his human masters.

Simon is the deputy minister of trade, a rising star in the British government, and a ruthless master magician. Bookish yet impeccably cruel, he retains powerful djinn to protect his home and execute his commands. He is intensely ambitious and participates in clandestine deals to secure magical artifacts, treating young apprentices and commoners with open disdain.

Arthur is a middle-ranking government magician working for the Ministry of Internal Affairs who adopts Nathaniel as his apprentice. Cantankerous and cowardly, he views his ward as a mere tool to bolster his own reputation rather than a child needing guidance. He possesses mediocre magical abilities and deeply fears his superiors. He strictly adheres to the harsh traditions of magical education.

Martha is a diminutive, white-haired woman who serves as the dutiful wife to her demanding husband, Arthur. Relegated entirely to domestic chores, she provides Nathaniel with the only semblance of maternal care and affection in his daily life. Despite her kindness, she remains thoroughly submissive to her husband's authority, retreating when conflicts arise.

Ms. Lutyens is a non-magical commoner employed as Nathaniel's drawing tutor. Perceptive and empathetic, she recognizes the young boy's intellect and isolation. She frequently challenges the orthodox beliefs of magical supremacy and stands out as one of the few adults willing to defend him against the cruelties of the elite class.

Faquarl is an immensely powerful djinni bound to the service of a master magician. Like his peers, he possesses vast shape-shifting abilities and a millennia-long history of forced servitude. He is ruthless in executing his master's commands and maintains a cautious, strategic relationship with other ancient spirits he encounters.

Jabor is a fierce and powerful djinni enslaved by Simon Lovelace. Tasked primarily with defense and violent retribution, he acts as an aggressive enforcer for his master. He is relentless in pursuit and willing to inflict maximum collateral damage to fulfill his bindings.

Simpkin is a foliot, a lesser class of spirit, bound to the proprietor of a magic shop. Unlike many ancient spirits who harbor deep resentment toward their human captors, Simpkin is proud of his subservient role. He eagerly collaborates with his master, drawing intense disgust from more rebellious spirits.

Kitty is a commoner girl who acts as the leader of a young, anti-magic group operating in the shadows of London. Despite lacking magical abilities herself, she displays remarkable courage and an unusual resistance to magical concealment. She actively organizes street-level efforts against the ruling class.

Stanley is a young commoner boy who works as a newspaper vendor on the streets of London. Operating under the radar of the magical elite, he uses his seemingly innocuous job to scout targets. He displays a surprising ability to identify hidden magical artifacts for his underground group.

Fred is a commoner boy involved in underground activities against the magical government. Working in tandem with his peers, he helps ambush vulnerable targets to strip them of magical tools. He relies on teamwork and surprise rather than spells to achieve his goals.

Schyler is an older, highly experienced master magician who operates on the fringes of the political elite. He harbors deep grievances against the current government structure. He prefers to work secretly, leveraging his vast magical knowledge to assist his former apprentice in dangerous schemes.

Amanda is a wealthy elite who owns Heddleham Hall, a sprawling country estate. She is romantically involved with a high-ranking politician and eagerly offers her home to host a major gathering of government officials, unaware of the true dangers brewing within her own walls.

Rupert Devereaux is the Prime Minister of Britain and arguably the most powerful magician in the nation. He represents the pinnacle of the elite magical government. He utilizes his position to enforce harsh laws against non-magical commoners while remaining a central target for ambitious rivals seeking his seat.

Jessica Whitwell is the intimidating Chief of Police for the magical government. Stern and uncompromising, she employs brutal interrogation tactics like the shrinking Mournful Orb to extract information from captured spirits. She acts as the iron fist of the ruling class.

Sholto Pinn is the proprietor of Pinn's Accoutrements, a high-end store dealing in magical artifacts. He is a government-aligned magician who employs bound spirits as shop assistants. He collaborates directly with authorities to trap and interrogate rogue entities.

Baztuk is an ancient utukku spirit bound to guard prisoners for the British government. Millennia ago, he survived a devastating battle in Al-Arish, leaving him with a deep, personal vendetta against the specific spirit responsible for the destruction of his people.

Xerxes is an enslaved utukku spirit stationed in the Tower of London. Tasked with preventing escapes and maintaining order, he is highly alert to magical trickery. He remains entirely constrained by the commands of the magicians who summoned him.

Mr. Purnell is a commoner employed as a political history tutor for young magicians. Despite his own lack of magical ability, he is thoroughly indoctrinated by government propaganda. He passionately teaches his students that non-magical people are unfit to govern.

Lime is a government magician and close associate of high-ranking conspirators. He assists with logistical operations for major political gatherings and serves as an extra set of eyes to spot interlopers at exclusive events.

Ramuthra is a terrifying, primordial entity from the Other Place capable of bending physical space. Extremely difficult to summon and control, its presence disrupts all magical planes of perception. It presents a catastrophic threat to any magician unable to command it perfectly.