This might not be totally related to what you're saying, but I do love me some coded gay villains (I'm lookin' at you, Disney). It is such the cliche, though it'd be great if more villains could be outwardly LGBT+ without their villainy and sexuality/gender identity being inherently tied together. It can be done, people! (I hope lol) Also, they should maybe not come off as predatory either? That might be nice? I guess it depends on the story...
But like, let's say the Evil Empress could just happen to have an equally evil GF by her side, nbd. She doesn't wanna seduce her ex-stepdaughter, aka. the chosen hero/rightful heir to the throne. That is creepy and also she is so not her type, and she already has an awesome evil GF, hello! xD
And it would help if in this same hypothetical story there were some equally not-cis/straight heroes and side characters. Because it is 2018 and we should have LGBT+ villains AND heroes and whatever the heck else, goshdarnit.