You need to know ALL of your characters as well as you know your protagonist, this includes the antagonist and any sidekicks. For minor characters, there needs to be a reason why they exist. Give all your characters some sort of backstory. You don’t need to go to the extreme of including that backstory within your writing, but there still needs to be something that draws that particular set of characters together. You may not use those details for the novel you’re writing, but there could be a spin-off story brewing in your mind.
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