How do your characters react to when things go well for them and then suddenly they're not any more? What is your world's equivalent to Murphy's Law ("anything that can go wrong probably will")? When the thorns of life do show up, how do your characters handle them?
How do your characters cope with adversity? Are they generous to others in the face of it or do they withdraw into themselves? In particular, when others are still doing well, how do your characters react to their change of circumstances which mean they're not?