I have one to add:
Jim C. Hines' Princess series features a lesbian as one of the main characters.

I also noticed you have some duplicates:

Flewelling, Lyn - Lucky in the Shadows

Should be Flewelling, Lynn - Luck in the Shadows, which is the first book of the Nightrunner series you already have listed.

Lackey - Magic's Pawn, Magic's promise, Magic's price and Lackey, Mercedes - Last Herald Mage are the same series.

McGuire, Seanan - October Daye series & McGuire, Seanan - One Salt Sea - which is part of the series above

I'd be happy to help clean up the list if you need some research help. :)