Hey Qory,
thanks for your reply.
The question you're mentioning should have an option to put your own individual answer, if you feel it's missing. :)
Please keep in mind that we are just two students. We don't make surveys peofessionally and just wanted to get a bit of an understanding what opinions about VNs are out there. It is highly likely that answers that many people would share are not there as a pre-typed option. We are humans, there is no way that we could pre-type every possible opinion out there. We just put what was at the head of our minds (wich included answers about diversity, since we, personally, care about it).
If it is your choice not to include a diverse cast in your VN that is entirely valid too, your idea sounds cool and we wish you the best of luck with your project :)