I think Christopher has similar personality as Holden, they both behave logically, Holden is a kind of people that do not want to talk with others. But Christopher doesn't because he would like to ask strangers for some information about the incident of the dog. And Holden doesn't want to care small things such as who killed the dog, he only want to live like a fake adult. Christopher behaves oppositely, he wonder who killed the dog and become a fake detective. They have similar situations, being separated from crowds, not good at communicating with others. Holden is a kind of lazy and want live comfortably, however, it seems Christopher is more strange, Holden is like a normal people doing wired things, Chris is like a wired people doing normal things but not perfect. Chris act logically and it showed us he wants to have a good relationship with others.