The first reason is we get to see what the characters are thinking. Secondly since the world war II is going on we know the atmosphere of the world much better. Lastly is what happens when liesel isn’t there to narrate. Firstly we get to know what the characters are thinking. Like what liesel think about stealing book. When liesel steals The Gravedigger’s Handbook it reminds her of her dead Brother. Secondly since the book takes place between 1939 and 1943 we get to see how the war affected characters. An example is Hans Hubermann and Rudy Steiner had to go to war and leave their families behind. And finally the last reason is we get to know what happens when liesel is not there to see events. Like we would have never know that Rudy, Hans, Rosa, etc eventually die without death telling us.
Lastly the characters in the book were very good for these reasons. Firstly we got to see the characters grow as the book goes on. Secondly the book had more characters than the movie, Lastly the characters in the