What the fuck is anonymus.. Maybe god?
This is just my interpretation, but I think Anonymous is supposed to represent the limits of our ability to understand other people. The point isn't that we have to totally understand everything about everyone, we just have to be able to accept them even if we don't understand them, and not try to force them to be something else. And as shown with Misora and Touma, a lot of the time people don't even really understand themselves. I think that this is a super important theme of this manga, and a really good point to make today when LGBT acceptance is increasing. Some people (e.g. Touma's dad) are just homophobic, but Koyama is an example of a character who wants to support queer people but tries too hard to inject herself into other people's lives. While outright homophobia and transphobia is obviously wrong, a certain kind of misguided progressive attitude can also lead people to treat queer people like trophies. Anonymous doesn't just represent an asexual or agender person, but in a way kind of represents all queer people: she defies others' abilities to try and fit her into a category for their own comfort, but if you accept that, she can be a great friend.
I'm not suggesting that you should never try to understand people. I just think that the pressure to understand people and the pressure to fit an identity can both lead to the exact opposite of their desired outcome. But yeah, I don't really get the whole flying thing.