I've thought about this a lot. I guess you could classify almost all my characters as LGBT, but at the same time, I'm more interested in imagining a reality where those sort of concepts just don't apply. The MC in "Zoo" is part of a unisex race that shits out eggs, for example. So I don't know if that's something other LGBT people can really connect with, even if it's the sort of character I actually want to see as an LGBT person.
And as far as age, I think my stuff is probably too crude and stupid on the surface for most adults/young adults, and definitely way too dark and heavy for anyone younger. I am pretty much making it for myself with no expectation of outside interest. If I can make myself laugh while I'm drawing the page, it's a perfect success.