Late to say this, but oh well. There was a time in my past that I didn't really understand the matter, and couldn't really picture representation of LGBT characters being in media without feeling forced for the mere sake of having an LGBT character and nothing more.
Getting into shows like Steven Universe helped open up my eyes.
Personally I'm not convinced that forced diversity isn't a thing. But whether you believe in it or not, can you really deny that giving LGBT characters more depth, flaws, humanity and drives is a much more positive and beneficial portrayal of LGBT characters than just solely focusing on the LGBT aspect?
Simply put, don't make the character one-dimensional. And especially avoid making them some kind of Mary Sue; honestly, that's a trait any character of any sort should always avert, and should frankly be obviously averted. The audience will have a hard time caring about or sympathizing with someone who can do no wrong, never runs into obstacles or issues in the story they're in, and always gets their way, no matter whatever other traits the character has. The reputation of LGBT people is more likely to improve if you make them and their story believable and someone the audience can really sympathize with.