Milada is an 11-year-old Czech girl with blond hair and light eyes who is forcibly taken from her family during the occupation. At a facility in Poland, she is renamed Eva and subjected to a rigorous training process designed to erase her heritage. Despite the pressure to assimilate into an ideal Aryan child, she secretly clings to her memories and a physical reminder of her grandmother to maintain her true identity.

Fräulein Krüger is the strict headmistress of the Lebensborn center where Milada is taken. She enforces indoctrination through strict routines and physical punishment. She renames the captive girls and serves as a terrifying authority figure during their training.

Frau Werner is the matriarch of the wealthy German family that adopts Eva. She is gentle and musical, holding a deep devotion to Nazi ideology and the Führer. She provides Eva with comfortable living conditions and maternal affection, though her unshakable faith in the regime creates a confusing emotional environment for her adopted daughter.

Elsbeth is the 14-year-old daughter of the Werner family. She resents her father's blatant favoritism toward her younger brother but finds companionship in Eva. Elsbeth exhibits both the polished traits of an ideal German girl and an independent streak, eventually forming a sisterly bond with Eva.

Ruzha is a Czech schoolmate of Milada who is kidnapped and taken to the same Lebensborn training center. Renamed Franziska, she eagerly embraces Nazi ideology and the training process, quickly becoming a model student and teacher's pet. She uses her favored status to intimidate other girls and completely discards her Czech identity.

Babichka is Milada's beloved grandmother who lives with the Kralicek family in Lidice. Before the family is separated by Nazi soldiers, she gives Milada a star-shaped garnet pin and urges her to always remember her true identity. Her memory serves as a guiding force for Milada during her captivity.

Mama is Milada's mother who works hard to provide a sense of normalcy for her family in Lidice. When the soldiers order the town's residents from their homes, she tries desperately to protect her daughters. Her memory represents safety and love to Milada throughout her time in the German training facility.

Papa is Milada's father, a farmer in Lidice who shares a love of stargazing with his daughter. He tries to reassure his family that the occupation is temporary, providing comfort and stability before the soldiers arrive at their door.

Jaro is Milada's older brother. He shares a typical sibling dynamic with Milada, marked by lighthearted teasing and underlying affection, before their family is forcibly separated by the authorities.

Anechka is Milada's baby sister. As the youngest member of the Kralicek family, she is separated from her father and brother alongside the other women of Lidice before the family is fractured further.

Terezie is Milada's best friend in Lidice. The two girls spend their days racing bicycles and stargazing together, representing the innocent childhood Milada experiences before the occupation heavily impacts her life.

Herr Werner is a high-ranking Nazi official who commands a nearby facility and serves as Eva's newly adopted German father. While he is highly affectionate with his son, he is harsh and dismissive toward the rest of his family.

Peter is the eight-year-old son of the Werner family. As his father's clear favorite, he uses his privileged position to get away with mischief, though he still shares typical playful interactions with his older sisters.

Liesel is a Polish girl at the training facility who befriends Eva. The two bond over their shared skepticism of the indoctrination and secretly meet at a small chapel at night, where they comfort each other by using their real names.

Siegrid is a girl at the Puschkau facility who quickly adapts to the training program. She becomes close friends with Franziska. The two operate as model citizens who use their favored status to humiliate girls who struggle with the transition.

Marcie is an American aid worker who helps locate and escort displaced children. She provides physical comfort and crucial information to those she assists, guiding them through difficult transitions.