A Separate Peace, by John Knowles, has several interesting characters to analyze. Students are often good at identifying and listing character traits; often they can find good evidence to back up their statements. However, they are not always successful at putting it all together, at looking at all of the pieces to come up with the whole picture.
This exercise teaches them the importance of process when analyzing character. Identifying character traits is only the first step in this process; in order to truly understand a character and his/her motivations or purpose in the story, students need to look at all of the evidence and make interpretive statements. Puzzle activities are perfect for teaching this skill.