One of the troubles with the Pathfinder / D&D method of creating classes is that people generally define their characters by that class. This makes sense since as a player it's helpful to know what niches are taken and what powers are available. It also makes sense that those categories would be available colloquially since people of particular classes function in effectively different ways within the game universe as well.
However that's not to say that you can't further define your character by what they spent their time doing before they took up adventuring. Sure, they might have been adventuring since Level 1 or since being a commoner, and sometimes that may be perfectly fine, but there are other options even if the game itself will be a dungeon delve.
What if you were a merchant caravan guard? Or a chronicler who writes the last day's activities next to your spell book? What if you are an archaeologist (hence Engineering, Dungeoneering and History) who picks up spells from carvings on the walls (ask your GM to let you aesthetically flavour your auto-spell-known-per-level from this)? Or maybe you were a pirate and lament being stuck in this place now?
And that's not even touching upon the jobs you might have had prior to being an adventurer. Technically you could gain levels from any regular task, it just takes longer. So perhaps the bard was a satirist whose satires got them chased out of town? Or that rogue could actually have worked with law enforcement to get the dirt on the bad guys? Or acted as a security specialist?
Was your barbarian a generally mild-mannered bouncer at an up-market establishment who chased off the unfortunate? Or even just a blacksmith with a military history and one hell of a temper? Your ranger could have bred horses back in the day or couriered messages across the land.
Even if you're a cleric whose task kind of connects with your class quite well, you could have a variety of different positions within the church: proselytizer, medic, almsman, protector of relics, administrator, or jack-of-all-trades as the solitary priest at the local church. Do you have a preferred title other than cleric? Are you a Father, Mother, Divine, Kezar, Whatzit?
I've found an easy way to develop your character and give them a bit more flavour be to give them an occupation in their history. It doesn't need to be complicated. It doesn't even need to come up much. It just helps give off that feeling that your character existed and has a place in the world. It also makes them more identifiable as we don't think of ourselves as Scientist, we think of ourselves as that health inspector that takes water samples from air conditioning units and examines shops for pests.
What are your thoughts? Do you do this yourself?