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Realism is just another style, fiction is never reality. With that said, unrealistic characters can make it harder to suspend disbelief, identify with the characters or care about them, regardless...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/20803 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Realism is just another style, fiction is never reality. With that said, unrealistic characters can make it harder to suspend disbelief, identify with the characters or care about them, regardless of genre. If you are discarding realism, you need to have a good reason. Most adults don't find characters and plots that are pure wish-fulfillment to be very interesting or compelling. We can all create our own wish-fulfillment fantasies if that's all we're looking for in a book or a story. The dominant impression when you read something like that is that the author is writing just for his own satisfaction.