User:SOTO/Forum Archive/The Panopticon/@comment-44988386-20200416234118/@comment-33762526-20200418082338 Category:Non-heterosexual individuals works well enough. I would support that. A bit clunky, but decent catch-alls are hard to come by in this regard, even outside of the DWU.
Sub-categories for more specific identities could definitely be helpful for readers of the wiki, because there are explicitly gay, bisexual, etc characters, but it's tricky to say where we draw the line, since even characters of the same sexuality can be expressed in a lot of different ways. Take Peter Summerfield ("gay", PROSE: Big Bang Generation), Alan Turing ("homosexual", PROSE: The Turing Test), Bill Potts (interested only in women, TV: The Pilot, described as gay by Pearl Mackie, Steven Moffat, etc), Vitus (interested only in men, TV: The Eaters of Light), Jenny Winterleaf ("butch dyke", PROSE: Verdigris), just for a few examples.
As far as characters who are trans or otherwise not cis, a focus on humans like SOTO suggests is wise. At least to start. Conflating certain alien or inorganic characters that don't fit into a particular binary gender with trans people has potential to be speculative and even offensive. And Time Lord gender is a whole other can of worms (though I can't pretend I don't identify quite a bit with the Doctor in this regard :P)