Ethan Kaille is a fictional character from the novel "The Devil's Arithmetic" by Jane Yolen. He is portrayed as a young boy who experiences significant growth throughout the story, particularly in understanding the importance of family and heritage. His character serves as a bridge between the past and present, highlighting themes of memory and identity. In the narrative, Ethan's journey is intertwined with the experiences of his ancestors during the Holocaust. Through time travel, he learns about the struggles and sacrifices of those who came before him, ultimately gaining a deeper appreciation for his cultural background and the lessons of history.