What is the difference between Bud and Todd in Bud not buddy?

In "Bud, Not Buddy," Bud Caldwell and Todd Amos represent contrasting personalities and backgrounds. Bud is a resourceful and determined orphan who has faced hardship and adversity, embodying resilience and hope. In contrast, Todd, who comes from a more privileged background, is a bully who initially mistreats Bud, highlighting the social disparities and differences in their experiences. This dynamic emphasizes themes of friendship, survival, and the impact of one's environment in the story.