I know this has been brought up countless times before (namely topic #16143, topic #15770, topic #10990, etc) but I want to bring it to attention once more.
I've noticed several transgender characters (mtf) like Aoi Futaba, Grell Sutcliff, and Alluka Zoldyck have been historically tagged as "male".
In Grell's case, she always refers to herself as female, even as far as saying she wants a "sex change." And despite all that, every image I checked of her has her listed as "1boy" and "otoko no ko".
There's a clear difference between transgender characters and characters that are otoko no ko. For otoko no ko, they're just boys that crossdress with no deeper meaning. Including transwomen in a search for otoko no ko is misleading, harmful, downright stupid, and also literally not what the term means.
Also, I've heard that Kino is nonbinary, but I haven't seen the show myself to confirm it. If so, then that would make Kino another character that has been mistagged to hell and back.