Is Bruno a multilayered or single layered character in “The Boy in the Striped Pajamas”?

 
Is Bruno a multilayered or single layered character in “The Boy in the Striped Pajamas”?
Is Bruno a multilayered or single layered character in “The Boy in the Striped Pajamas”?
Is Bruno a multilayered or single layered character in “The Boy in the Striped Pajamas”?