Well this likely won't be the last time we'll see Kite and her new Koala lackey so in the future we may just see something along those lines.
It's a different issue when Togashi is the one writing it.
The thing is when LGBT issues are brought up in a Togashi story you can be certain it's almost always intentional. That, and he usually treats them with a caliber of respect or at the very least a tongue-in-cheek joke that doesn't have "he's gay" as the punchline. To date his 3 shonen manga (Yu Yu Hakusho, Level E, and of course Hunter X Hunter) and a few of his unreleased works (according to Togashi anyways) all have played around with LGBT issues to varying degrees and he himself has said something to the degree of having interest in the LGBT community. I'm probably mangling that quote though, I can feel it. Point is he plays around with those themes in his stories so Alluka being a transgendered child and Kite switching gender are pretty much in there just because. Not that there's anything wrong with that.
Naruto either does it unintentionally or as fanservice. Bleach is probably the same way with it leaning closer on the fanservice side from my view but I suppose either of those are up for speculation.
Hmm I wonder what it says about this series or the people who post when the topic of gender identity continually comes back up in this thread haha~?
You forgot to mention Kurapika. ..
or more specifically LeorioXKurapica