Hi!
Actually, that is an interesting question. And I am looking for those books, too, for I need them as input for a story I am writing.
Well, I never came across a fantasy book with gay main characters. But some were bisexual, I would say.
Like Kushiels'Dart: Phédre is doing it with both men and women. And she is even very smitten with one special woman.
Or the trilogy by Allison Spedding, 'A Walk in the Dark'.
Then there was 'Havenstar' by Glenda Normaly in which the main protagonist meets a pair of female lovers. Only mentioned, yet better than nothing.
And the German fantasy books based on the RPG-World of Aventurien. In some of the (more than 60) novels it is not unusual to come across someone gay.
The only translations I know of are three books. The series is called 'Realms of Arkania' and I don't know much about those three books. Generaly I don't like these books, anyway.
More I do not know . . . ah, I do! Freda Warrington's 'Jewelfire'-Trilogy. There is a gay relationship in it! And not an too unimportant one.
But that's it.
Bye!