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I think it's a good approach! As a reader, I would enjoy the sense of mystery, and I don't think you should change it at all. As for what he should be called before he's introduced, what about his ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/24321 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I think it's a good approach! As a reader, I would enjoy the sense of mystery, and I don't think you should change it at all. As for what he should be called before he's introduced, what about his eye color? There's nothing special about, for example, brown eyes. It would be hard to make that a spoiler. If not that, what about giving him a habit- for example: "the smoker;" "the fidgeter;" "the foot-tapper;" "the whistler." While I can't recall any books that use the nameless approach, ( though there are probably a good amount of them out there) I have used it in my own writing by referring to a man according to the color of his cloak and "the hooded man." There's so little ways to use this approach, which makes it pretty difficult, but I do like it a lot. I hope you can work it out, and the very best of luck to you! (I hope I was helpful, and I apologize if I wasn't)