I could see
Hook switching teams.
And then of course, there's Peter Pan and his love of little boys, but, I don't think that's an image we want to propagate.
Rumplestiltskin seems like a bit of a swishy Queen, despite being father to Baelfire (Though, prior to becoming the Dark One, he didn't seem to be quite so swishy, just a bit of a coward)
And, Sydney the Mirror? I never did buy into his Heterosexuality
We know very little about most of the Dwarves, almost any one of them could be brought forward to be Gay