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You didn't say why you want to keep the gender ambiguous. That might help in giving a good answer. One possibility that doesn't deceive the reader would be to write 1st person and make your main c...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27730 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You didn't say **why** you want to keep the gender ambiguous. That might help in giving a good answer. One possibility that doesn't deceive the reader would be to write 1st person and make your main character himself confused about his gender. Maybe he grew up outside his society where androgynity was normal. Or maybe for him it was normal all his life, now he met other species and wonders which gender he is - he never wondered about it before, doesn't understand his species is different, etc. (\*) using the male pronoun for readability. If you seriously write this story, you absolutely need to invent an androgynous pronoun.