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It depends on context. Why has the character's name never been mentioned? Why does no one know it? What label, nickname, or epithet are you using to describe the character instead? I would mentio...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/21811 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It depends on context. Why has the character's name never been mentioned? Why does no one know it? What label, nickname, or epithet are you using to describe the character instead? I would mention that as a reader, I'd be surprised and maybe do a double-take or two to wonder _why_ more of a big deal wasn't being made at the reveal. If the other characters have been desperately trying to establish the person's name and it shows up and there's no fuss, that won't work. But if you can make it work, go for it.