A frost-demon and ancient figure from Russian folklore, Morozko serves as both a mentor and a complex romantic interest for Vasya. His character is marked by his struggle between maintaining his supernatural identity while grappling with newfound emotions.

The novel's main antagonist, Kasyan is a conniving sorcerer who seeks political power in Moscow and harbors a deep connection to Vasya’s family. He adeptly manipulates those around him while concealing his true, malevolent identity.

Vasya's older brother and a respected warrior-monk, Sasha is a figure of authority and moral integrity who is forced to navigate the complex political and familial challenges posed by Vasya's unconventional actions. His relationship with Vasya tests his loyalties and faith.

The Grand Prince of Moscow, Dmitrii is a young, charismatic leader eager to expand his power and influence but cautious of external threats. His interactions with Vasya and her siblings highlight his struggle with the expectations of masculinity and leadership.

Vasya’s older sister, Olga is a highborn lady who has embraced her traditional role within the confines of the terem, utilizing her position to navigate court politics. Her relationship with Vasya showcases the tension between familial love and societal expectations.

A zealous priest with a captivating presence, Konstantin harbors a deep animosity towards Vasya and becomes an unwitting tool in Kasyan's schemes. His fanatic devotion to the Christian faith leads him to view the old pagan practices as abhorrent.

Olga’s young daughter who shares Vasya’s ability to see the magical spirits, Marya represents the next generation of her family’s mystical lineage. As a child with strong potential, she is both a symbol of hope and vulnerability.