What is the protagonists stage of identity development throughout the boy in the striped pajamas

Beginning

Middle

End

At the beginning the boy (Bruno) seems to like to be be heard because of his small argument with his father. In the middle, it could be said that a change of personality occurs, due to his friendship with Samuel. He finds out that Samuel is a Jew, however, he tries him in the same way, without paying attention to what her sister says to him. At the end, Bruno decides to stay with his friend even though it represents a great gender for him. He stands by his "best friend"