I have a comedy comic with lots of lgbt+ characters, and it's definitely more comedy (and some sci-fi) than romance [on a short hiatus but will be back in about 2 weeks and many episodes are up already ]
My other comic is a lesbian sci-fi romance, with more focus on the romance than sci-fi (in this particular story) so it might not be what you're looking for. Just wanted to mention it since you wrote you like sci-fi
might add some recommendations from my library later, once I've actually read everything^^;