So the running joke in my series is that there is precisely one straight guy - and that's pretty much the truth.
Mirrorfall has an ace protagonist (though she's not out yet/doesn't realise it herself yet), and amongst the main and secondary cast we've got bi & pan characters, genderfluid and GNC characters, and more. And our one straight boy, of course.
My series is urban fantasy - with a lot of geeky stuff and a heavy focus on found family.