*Zatsune_miku*? Is it a mistake?
of course.
Of course *not*. But Hatsune is not wrong either.
zatsune is a black hatsune, right?
From Danbooru wiki:
Miku Zatsune is an alter-ego of Miku Hatsune.
She is Miku that is more provocative, in the sense that she is somewhat sexier than the original. She also sings "sexy" songs.