Blueriders are bi- or homosexual. Although no one expects that all blueriders in the club, especially with the heavy female slant we have, will be involved with males, it's just not canon for a bluerider to ignore that aspect, and it detracts a bit from what makes them unique. Female greenriders tend to be more flirtatious and whimsical then queenriders, and are probably the single largest group in the club. Male greenriders are the more feminine partners of a homosexual relationship and are generally less reliable and predictable then any of the other riders. The do carry a minor posting requirement - gold flit owners must post the flit's mating flight and PC the clutch.
Bronzes are an extremely minor form of rank.
If you're a new member or you hardly ever post, you probably won't. They aren't nearly as hard to get as gold flits or bronzeriders, but you still have to earn them. Browns, blues, and greens are available to anyone who wants them and doesn't already have too many pets. Without Board approval, personas are limited to three pets. If you have an existing persona and you want to set him or her up with a firelizard, then the best route to take is to wait.