TheCosmicKid
Hero
I believe it exists somewhere in 3E. Book of Exalted Deeds, perhaps.is Peace Domain too hippie?
And running with that, as a worldbuilding point, I'm more likely to look for the elemental emotional concept underlying the intent here than to tie the domain to a community and culture that are very much specific our own world, time, and society. In different worlds with different histories, who knows how people whom we would think of as LGBT think of themselves? Whether they identify with each other or regard what they feel as being markedly different from the rest of the population? A god, I think, is going to be dealing in "Love" rather than "three particular types of love, plus a form of gender identity", or "Peace" rather than "four particular groups of people historically in need of peace". That's usually how they roll.