I've discussed interviewing your characters before as it can give good insights as to their full personality, which in turn will inspire and drive the way you write about/for them. But let's switch that. What would your characters ask you? What are they happy about in your portrayal of them and why? What are they unhappy about and do they have a point? (!).
What are their ambitions (long and short term) as these might not coincide with what you originally had planned? Are their voices distinctive the way they need to be so your readers always know who is talking?
Are your characters, in themselves, good listeners to others in your stories? What are the consequences if they are not? This could be anything from missing a crucial bit of news to irritating another character so much they end up wanting to kill Character A! (In a crime novel, they would kill them!).
There should be some good story ideas there!