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Up to the writing. If you create characters with whom your audience can identify in some fashion, someone to root for, then their species doesn't matter. Diane Duane has many non-human protagonis...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/17686 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/17686 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Up to the writing. If you create characters with whom your audience can identify in some fashion, someone to root for, then their species doesn't matter. Diane Duane has many non-human protagonists and hero characters in her various books: sentient fish and trees in her Young Wizards series, Romulans and Vulcans in her Star Trek books, a series about sentient magic-wielding cats — it's all possible.