What are Randy's strengths and weaknesses? And how do they impact the outcome of the novel?

Before the nuclear war, Randy was rather aimless and lazy. Really he is sort of a "playboy" who rebukes commitment and responsibility. Randy is also laid back enough not to harbour a lot of prejudices. He has another side to his personality when he is really tested. He doesn't covet things that do not matter, especially after a world altering event like this one. He is able to shed his lazy non comital side and take control of the situation.