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Here's a way to look at it: suppose a Cerberus the size of a horse shows up in the middle of a crowded shopping centre and starts grabbing people. Most "real" people would either run away screaming...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/34383 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/34383 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Here's a way to look at it: suppose a Cerberus the size of a horse shows up in the middle of a crowded shopping centre and starts grabbing people. Most "real" people would either run away screaming, or freeze in horrified shock. These people don't make a good story - they are boring. They are reactive, not proactive. The interesting character is the person who would attempt to face the monster, or help people away from it, etc. Now, this character is not "unreal" - it's not impossible that one such person would be found. Maybe even more than one. But they'd still be the one standing out, right? When a real person is told "don't go to place X, it's dangerous, it could kill you", most "real" people would avoid place X. And then you have no story. Most real people miss clues because they were distracted, make excuses for why they failed at something, lack the determination to relentlessly pursue their goals, are sometimes too tired to do what they know they should - they are blander than they would like to be, blander than you'd want your character to be. That is not to say that there are no people who would be like the characters you would want to portray, but such people are rare. There's a reason not every soldier becomes Napoleon. That is not to say that real people, boring everyday people, shouldn't be an inspiration for you. The kind of character quirks the people you know might have - it's hard to come up with these if you have to invent everything from scratch. Observe people. The stuff that makes a person, any person, interesting, for good or ill - that's great story material.