Equally what is the luggage, again literal or otherwise, they carry around with them that they desperately need to get rid of if they are to make progress? Do they succeed in doing this? What gets in their way (and that can include themselves)?
What is the one possession your character would save above all else? What would they go back into the fire for? One course I learned so much from at Swanwick Summer School was a course on character pyschology. Fascinating stuff and it will be of enormous help in future character creation. One of the sessions was a look at the characteristics of psychopaths. This was both scary and enlightening, especially the total lack of empathy. What matters most to them is themselves...
What matters most to your characters and what threatens their ability to keep hold of this? How do they deal with that threat? Some of course will rise to the challenge, others will fall apart when facing any threat. So how do your characters react and why?