Japan calls it "otoko no ko" (Literally translates to "male woman") and it originates from male kabuki theater actors playing the roles of women; It has evolved in a Japanese cultural phenomenon of boys dressing as girls in anime, and in real life.

In the west these are called Traps (Research this topic at your own risk) There's also "futanari", the Japanese equivalent of the "she-male" (do NOT research!)

Keep in mind the Trap concept predates the LGBT movement by over a decade, and they tried to call "Trap" a slur against them, although a much more offensive term would be "Ugly Bastard" (DON'T EVER search that tag on any anime site!)

I think the main point of traps is to add a bit off...."spice" to anime characters that would be considered too generic as just a girl, but the fact that the trans "community" choose to associate a niche concept with the intentional targeting of transgenders by men (yes seriously)

But yeah it's fair to say the transgenderism movement is getting way out of control to the point where it presents a clear danger to society.