Hatsune Miku's backstory is that she is an android (gynoid?) and she certainly does perform as a projected video image (sessile robot.)
If Miku was a machine she would not experience the pleasures and pains of embodiment, but Wokada puts back the missing elements to depict a fully embodied Miku, starting from the detailed study of anatomy and putting it together with the "slice of life" situations that one might find in a game like Project Diva.