Throw "Rain LGBT" on the list.
(Apparently I can't link on my first post.. defuq? Just google it or go to Smackjeeves and put it in as a search)
You could add "Wildflowers - A Transgender Webcomic" on there too.
(Also on smackjeeves, and comicfury)
If nothing else, hit up the 'Other Stuff I Read' on Wildflowers, I linked all of the trans* webcomics I could there.