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Rhys Foster
Feedback Wanted
A recurring side character can quietly stop being “supporting cast” and start doing structural work. That usually happens when they begin changing the shape of scenes, not just filling them.

The awkward bit is that fondness is a poor test. A writer can keep someone around because they’re enjoyable, or because they genuinely earn their place. Those are not the same thing.

I’m interested in the point where a familiar face starts carrying plot, pressure, or contrast the book would miss without them. If they vanished, would the story lose a thread, or just a favourite thread?
James Walker
Sometimes the useful side character is the one who changes the temperature of a scene, not the plot. They make the main character behave differently, or reveal a weakness that would stay hidden otherwise. That’s harder to spot than “do I like them?”, which is why fondness can be such a trap. A scene can survive losing a favourite. It’s less forgiving when you remove the person who forces everyone else to react.
Rebecca West
A side character can also do useful work by refusing to be “structural” all the time. Some of the best ones create friction simply by being inconveniently themselves. They don’t advance the plot so much as expose where the plot is pretending to be tidy.

In a mystery, that can matter more than usefulness. A familiar person who keeps interrupting the main line of thought can reveal what the protagonist is avoiding.