I think that fiction gets complicated because people like to extrapolate some of the events that go in them into trying to state people hold positions they may not actually believe.
So like if a character is questioning if they're trans or not, or at one point thinks they're gay, and comes to the conclusion that they're not, I think that's just apart of their journey as an individual. So, just because one character considers it at some point, and comes to a specific conclusion, I don't think the author is saying everyone in that circumstance should come to the same conclusion, just like how if someone may question themselves and realize they ARE trans or gay, that doesn't mean everyone that holds doubts at some point is.
Plus I think you can use textual justifications and evidence from the story to see if a character may actually be LGBT or if they're just going through some stuff that may make them think they are, whether that be they base the notion on outdated stereotypes and so either group themselves into that group based on it, or if they genuinely do have attraction towards members of the same sex or may be trans. I think it could work well if explored.
@gomichandesu