Answer:
Death's interactions with the survivors in the Book Thief serve to further develop his characterization. For instance, in Chapter 5 when Death tells Liesel that he has no color or shape and he will simply have to describe himself, Death acknowledges his intangible presence and recognizes his own inability to physically interact with others. This moment illustrates Death's isolation and loneliness, even in spite of his seemingly omniscient awareness of humanity.
Moreover, through Liesel's relationships with her family members, neighbors, and Hans Hubermann (her adoptive father), Death is exposed to a wide range of emotions that helps him understand how humans react to tragedy and the joys of everyday life. The depth of his emotional connection is best demonstrated when Death finds himself mourning for Max Vandenburg after finding out about the Nazi death camps from Rudy's library book (Chapter 24). In this moment, it becomes clear that although Death cannot be "moved" as humans are moved by emotion, he can still feel empathy for others. Thus, these interactions allow Death to discover a kind of inner peace which further defines him throughout the story.
Step-by-step explanation: