Rose is a 17-year-old dhampir in training to become a guardian. She is fierce, impulsive, and wholly dedicated to protecting Lissa. Her lack of conventional filtering and quick temper often land her in trouble with authority figures at St. Vladimir's Academy.

Lissa is a royal Moroi princess and the last surviving member of the prestigious Dragomir family following a fatal car accident. She possesses a rare, unidentified elemental magic that takes a heavy toll on her mental health. She exhibits a kind nature that heavily contrasts with the manipulative political environment of the Academy.

Dimitri is a highly skilled, 24-year-old Russian dhampir guardian. He wears six molnija marks on his neck, indicating his lethal success in combat against Strigoi. He strictly adheres to the rules of his profession, firmly believing that guardians must prioritize their Moroi charges above all personal desires.

Victor is a royal Moroi and Lissa's distant uncle. He suffers from Sandovsky's Syndrome, a degenerative illness that causes chronic coughing and physical weakness. Despite his failing health, he maintains a warm, fatherly presence at the school and holds considerable political influence among the vampires.

Christian is a royal Moroi specializing in fire magic. He endures constant social ostracization because his parents willingly turned into Strigoi. He uses a sarcastic, cynical exterior to deflect the cruel judgments of his classmates, preferring to spend his time alone in the chapel attic.

Natalie is Victor's daughter and Lissa's distant cousin. She shares a dorm room with Lissa and chatters nervously about school gossip. She lacks the typical social grace of other royal Moroi students, making her somewhat awkward around her peers.

Kirova is the strict headmistress of St. Vladimir's Academy. She prioritizes the school's reputation and the safety of the royal Moroi students above all else. She views Rose as a reckless influence and eagerly searches for reasons to dismiss her from the school.

Mason is a fellow dhampir novice training alongside Rose. He maintains a friendly, easygoing demeanor and frequently aids Rose with information and library research. He harbors clear feelings for Rose, which she struggles to politely manage.

Mia is a younger Moroi student who aggressively targets Lissa and Rose upon their return to the Academy. She uses her water affinity to play mean tricks and orchestrates malicious rumors about them. Her royal pretensions mask the fact that her parents work as common servants.

Aaron is a Moroi student and Lissa's ex-boyfriend. He is easily swayed by social pressure and the political currents of the Academy's popular crowd, frequently shifting his allegiances based on whoever currently holds the most status.

Jesse is an arrogant royal Moroi student who fetishizes dhampir women. He attempts to pressure Rose into a physical encounter and quickly turns to spreading malicious, sexually explicit rumors when she rejects him.

Ralf is a Moroi student who frequently causes trouble alongside Jesse. He participates in spreading rumors around the school and enjoys harassing lower-status students.

Ms. Karp is a former St. Vladimir's teacher who exhibited signs of severe mental distress before abruptly leaving the school. Rose remembers her erratic behavior and strange magical abilities with a mix of curiosity and unease, noting similarities between her and Lissa.

Tatiana is the authoritative queen of the Moroi. She commands immense respect and enforces the strict social codes of vampire society, showing little patience for perceived dishonor from royal families.

Alberta is an experienced female guardian at the Academy. She serves as a rare example of a successful female dhampir in active service, commanding the respect of the novice trainees.

Stan is a cynical guardian instructor who severely doubts Rose's capabilities. He emphasizes the lethal speed of Strigoi to keep his students grounded in the harsh realities of their future profession.

St. Vladimir is a historical Moroi saint known for his exceptional magic. His writings and legacy provide Rose with vital clues about the nature of rare magical bonds and the toll they take on the user.

Anna is a historical figure who served as St. Vladimir's guardian. Her mysterious title of being "shadow-kissed" closely mirrors Rose's own experiences, prompting Rose to research her history.