Hope you can find a good balance. It's a neat concept, but I think it's going to be hard to balance, because you kind specific of need the hints too. I ran into "having both male and female traits." I tried Hermaphrodite, herm, Non-binary, nonbinary, intersex, futa, and androgynous, all of which were valid answers, but because it was behind the Patreon portion I couldn't even get the first letter and had to give up.
My best suggestion would be just pay gating portions of the content that aren't even accessible to the free version.