Statistically speaking, Star Trek
already has a number of gay characters. They're various members of the Enterprise
crew, citizens of Earth, Vulcan, Romulus, and so on, and they serve in other areas of the Federation. You just don't know it because simply being gay isn't automatically some kind of openly telegraphed behavior, but they're there.
I tried to make a deal with the Devil, once. Turns out I didn't have anything he wanted.
You will never find a more welcome hive of love and humility.