1. Bruno: Bruno is the son of a high-ranking Nazi officer. He comes from an upper-class, privileged background. He lives a comfortable and luxurious life with all the benefits of his family's status.
2. Shmuel: Shmuel is a young Jewish boy who is imprisoned in the concentration camp where Bruno's father is commandant. He represents the lower class and the victims of the Nazi regime. Shmuel is subjected to harsh living conditions, mistreatment, and the horrors of the Holocaust.
The contrast between Bruno's social class and Shmuel's reflects the stark differences in the treatment and experiences of people based on their social status in Nazi Germany. The movie effectively portrays the gross inequalities and injustices that existed during this dark period in history.