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I think humans are more than well-represented in your story so far. Even Sir Arthur Conan Doyle, who eventually crammed pretty much all of Europe plus Asia into a Sherlock Holmes story at some poin...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/33826 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I think humans are more than well-represented in your story so far. Even Sir Arthur Conan Doyle, who eventually crammed pretty much all of Europe plus Asia into a Sherlock Holmes story at some point, could only have so many characters in a single story. The more characters you add, the more development you need (even if the characters are minor, there will be some level of change to keep track of over the course of the story). If you think you can handle it, go for it! Just don't push yourself too far because you are worried about too little diversity. You already have plenty. In answer to your second question, I think most audiences are capable of separating an antagonistic character from their race--unless this character is overtly stereotypical or in poor taste. It this case, you might get some negative attention for that character.