1) Good example: Ellie in The Last of Us: Left Behind
Bad example: Ellie in The Last of Us: Part II
2) There shouldn't inherently be more of anything because I feel like on a broader scale the gaming industry allows for most game creators to make the kind of game they want. It's really up to the artists and developers what they want to portray. I say this, but I don't think we're quite there yet. There probably still needs to be some more diversity allowed specifically in the Triple A sphere.
3) Not including Mass Effect, I really only know one LGBT game character. So no, not really.
4) I'm a B