•How are your characters’ basic needs met?
•What is the hierarchy (and there has to be at least one, someone has to be top dog)?
•How is your world governed? Are there rules nobody can break? What are the reasons?
•In dealing with magic, can everybody produce the same amount? Or do certain groups have more magic than others? Can those lower down the scale “earn” or “learn” more magic to bring them closer to their superiors?
•What happens if someone defies the basic rules or some lowly herbert betters themselves magically so they become superior? What would the fall out be?
•What happens if someone from the superior class magically speaking rebels against that or the structures of your society?
•What do your characters do to relax? How do they show stress? Do you have any “stiff upper lip” types? If so, how do they show stress? The traditional way would be a nervous tic but can you show a unique way for your unique character to reflect their state of mind?
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•Bad habits? What do your characters have? How did they develop these? Do they drive a loved one mad? Who are their loved ones? How did those relationships develop? You may well find you don’t need to put all or any of this into your story but as long as you know the answers you will be able to write about and for your characters with confidence, which will show in your stories.
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•Good habits? Quirks? Do they agree with their world’s politics? Have they any ways of showing their views? What are the consequences?
There are loads of stories to be found in answering these!!!