Dewey’s father, a scientist working on the Manhattan Project. He nurtures Dewey’s interest in science despite being often absent due to his work commitments.

An artistic and somewhat socially isolated girl, living in Los Alamos during wartime. Her evolving friendship with Dewey becomes a key aspect of her character development.

Suze’s mother, a chemist involved in the Manhattan Project. She is compassionate and plays a supportive role in Dewey’s life.

Suze’s father, a physicist who contributes to the Manhattan Project. His excitement over the project’s success contrasts with his wife Terry’s moral concerns.

A trio of popular girls at Dewey and Suze’s school known for bullying them. Their actions challenge Suze’s loyalties and contribute to her character growth.