Jake Without the Rest
Looking back from the end of the book, I think Jake might possibly be an introvert. Jake's happiest, most relaxed moments are when he is by himself or with a single friend. For example, when Brett goes to San Sebastian, or Jake and Bill's week in the mountains, or Jake in San Sebastian at the end of the book. During these times, he is content, calm, motivated (fishing, swimming, newspaper-ing), and enjoys life. For example, when Brett and Cohn are in San Sebastian, Jake remarks "I rather enjoyed not having to play tennis", and Jake also describes himself as being productive at work -- even getting ahead so he can take more vacation time. In contrast, his friends bring with them turmoil. Brett showing up in the middle of the night, Cohn's romantic worldview clashing with the rest of the group, the fiasco at the fiesta with Romero, Mike's belligerence, et cetera, et cetera, et cetera. It's during these times where Jake thinks things "to hell with yo...