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As long as the change is obvious that sounds like an interesting take on naming your character. You should think about how the exact change happens - it's probably unnatural if your narrator sudden...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/33053 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/33053 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
As long as the change is obvious that sounds like an interesting take on naming your character. You should think about how the exact change happens - it's probably unnatural if your narrator suddenly completely switches from one name to the author. Old habits die hard. You could for example make it pretty obvious by letting the narrator start with the first name and interrupt himself: > You know, Doo- I wanted to say _Doodler_ again, sorry - You know, Rebecca, that's a very fine idea. And after one or two such mistakes it becomes normal to use the latter name.