I've firmed up my planning, to the extent that I write down what the themes of a new novel will be, which I find helps to guide the direction of the narrative. My WIP, which I'm in the final two chapters of writing, has themes of men's brutality towards women, untold secrets, avarice and our frailty when confronted with the forces of Nature.
I've heard of some writers having a working title that guides their thoughts, though they choose a catchier, more commercial title once finished. I work the other way round—I need the title decided before I begin, as this stimulates my creativity. My WIP is called
An Elegant Murder, which is hinted at by a murder victim being found dressed in an ornate 1950s ball gown, tiara and opera gloves, but the elegance is more sardonic in the manipulative way she's put to death.
Some titles of successful books can be heavy handed or brutal. Stieg Larsson original title for
The Girl with the Dragon Tattoo was
Män som hatar kvinnor; in English:
Men Who Hate Women. It was published this way in Sweden but retitled to be less confrontational once it was marketed for English-speaking readers.
I also write brief biographies of the main characters, before I start on the story. I refer to these from time-to-time, wary of turning individual players into some homogenised universal voice. This helps me to create fictional people who stay true to themselves, and they sometimes do things I hadn't anticipated. My plotting is more of a scaffold for me to rest the building of my story on, which means that my characters sometimes swoop about the scaffolding poles like so many gibbons!
I don't let this get out of hand, but my novels are about a team of detectives trying to solve complicated murders, so they're bound to disagree with one another. My protagonist, the Chief Inspector, has chosen them for their different skill sets. He follows the maxim that was recommended by basketball coach
John Wooden:
Whatever you do in life, surround yourself with smart people who'll argue with you.
In this way, my characters drive the plot.