People identifying as LGBT are not too common in media, but The Simpsons has made an effort to be inclusive. Some of these are quite well written too. Please be aware that some of the characters on this list are not treated as sensitively as others.
The idea was to make a list of relatable LGBT books that weren't about coming out, because that isn't the only part of our lives that's important! The main character had to be the LGBT one, and no biphobic, transphobic etc. books were allowed.