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If it doesn't propel the story, there is no need to even mention it. For example, I've heard an interpretation of Sam and Frodo (from J.R.R. Tolkien's Lord of the Rings) as being a bit of a gay ...
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Source: https://writers.stackexchange.com/a/34588 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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If it doesn't propel the story, **there is no need to even mention it.** For example, I've heard an interpretation of Sam and Frodo (from J.R.R. Tolkien's _Lord of the Rings_) as being a bit of a gay love affair. And this was the perspective from a family member of mine who IS gay. Now, the beauty of that perspective, is that, there is nothing to disprove that Sam and Frodo didn't have more than just friendly feelings towards each other. Maybe they spooned a bit when they took a rest? I mean, who's to say? The point is, it really doesn't matter. But it's great that someone can imagine more to the story. And that is the beauty of great writing. Actually the beauty of great art, where people can interpret all the facets of the work from their own perspective. A very famous example of where mention of this DOES propel the story is Annie Proulx's _Brokeback Mountain_ (short story turned into movie). This is more of an in-closet form of sexual expression, but it does address the complexities of emotional attachment regardless of sex. I did read this story (long time ago), and there was quite a bit of detail that get's into the psychological aspects that these two men faced in their lives. That's part of the story. But the great part about it, is that it wasn't trying to be an exclusively "gay" story. It's a love story that is specific to these two characters. * * * Aside from the story, examine what you mean by **LGBT** There's a too much generality in the term LGBT. I don't know anyone who would call themselves that. They are either one or the other... not lesbian, gay, bi-sexual, and also transgendered at the same time. And if you want to get a bit more specific with all 4 groups... there are even "sub-groups" (for lack of a better way to put it). So when you say your characters are identifying as LGBT, that's not really saying anything other than they are not straight. And on the flip side if a character is not lumped into the LGBT category, why would it be interesting to even let it be known that they are straight? Again, it should all come back to the story. It's been mentioned in other comments, but what would be best to focus on is the characters as an individual. Whatever group they identify isn't what makes them an individual. As much as I don't want to make this an opinionated answer, I think an injustice you would do to your characters (any of them) is to put too much focus on their group identity. It'll just make your characters bland and stereotypical. It makes them more 2D and cartoonish because in real life, there is much more to an individual than their sexual preference and gender identity.