Before the word "genderless" had ever left my mouth in any discussion other than grammatical, I hung out with a lot of OtherKin. It wasn't even really intentional - I just gravitated towards people of that character, despite feeling quite human (there was once an unofficial contest of "What is Pneumonica really?" - interestingly, the winning result was "a computer designed to think like a human"). They are much like we are - people who don't feel right in their bodies. In their case, the matter is species rather than gender. In point of fact, technically my fiancee stands among them.
And in many cases it's more than just animal-in-human-form. The Therians are just a subset of a larger group.