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Characteristics you introduce are often unintentional promises. To be too obvious here, if I write a character from the beginning that was a long distance sniper in the Marines, but he is leaving ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/33241 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/33241 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Characteristics you introduce are often unintentional promises. To be too obvious here, if I write a character from the beginning that was a long distance sniper in the Marines, but he is leaving the military to become a safe boring accountant, readers are going to expect him to shoot somebody. Otherwise, why did I make him a **sniper?** Perhaps I did that for the contrast and to give him something to "escape", PTSD from being under fire while shooting dozens of enemy soldiers. But that characteristic is a promise: A sniper should snipe, a Marine should fight, Don Juan should seduce multiple women, and a woman spy trained to trade sex for information should be shown doing that in the story. This is similar to "show don't tell", but basically in the opposite order: If you tell us something **unusual** about a character or something that has dramatic potential, the reader expect that to pay off sooner or later. If you tell me Bill is forgetful, he better forget something. If you tell me nothing about Chuck's height or build, I expect him to be average, and don't expect him to turn out to be six foot eight. If you tell me he is six foot eight, I expect that to figure into something at some point. What you write is there for a reason, and this is unlike real life in that sense. IRL you can be friends with some giant person and that never has any dramatic consequence. In a story, such an unusual characteristic makes the reader expect some consequence.