Secondary characters often flatten into plot devices unless you deliberately develop their inner logic and stakes, which takes space that primary characters dominate in limited word counts. Using AI to brainstorm and develop supporting character psychology—their desires, fears, and how they perceive the protagonist—creates texture and makes their presence feel necessary rather than ornamental.
Secondary character depth scaffolding is a structured approach to using AI prompts to build out the interior lives, personal histories, and independent goals of supporting characters so they feel like full people rather than plot devices.
Memorable supporting characters are what separate good fiction from great fiction — AI can generate parallel backstories, hidden agendas, and off-page lives that inform how secondary characters speak and act on the page without overwhelming the narrative.
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