How do Liesel, Rudy, and Hans maintain their sense of individuality throughout the book?

Rudy never falls prey to the Nazi ideology and the Hitler Youth. He is independent, even as a child. He painted himself black to be like Jesse Owens rather than to make fun of him. Rudy was impressed by Owens's athleticism and wanted to pretend he was Owens running around the track.

Please ask about each character one at a time. Thanks.