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Could you use a pseudonym for the unnamed character, something he can go by that obscures his other details? Something like Strider/Aragorn from LoTR.
Answer
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/29803 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/