Specific personalities vary, but are always extreme. A drummer might be the funniest person in the world, or the most psychotic, or the smelliest. Drummers are uneasy because of the many jokes about them, most of which stem from the fact that they aren't really musicians. Pianists are particularly successful at making drummers feel bad. If you decide to talk to the drummer during a break, always be careful not to sneak up on him.
Saxophonists think they are the most important players on stage.
Consequently, they are temperamental and territorial. They know all the Coltrane and Bird licks but have their own sound, a mixture of Coltrane and Bird. They take exceptionally long solos, which reach a peak half way through and then just don't stop. They practice quietly but audibly while otherpeople are trying to play. They are obsessed.