Humans can express so much through just our eyes alone. For example, in Japan, there’s the sanpaku (三白, lit. three whites) look, where the whites of the eyes are visible above or below the iris. This look gives characters a bit of a cool edge, and you’ll often see it for characters who are a bit taciturn. Hatsune Miku certainly has a different aura than usual with this effect, don’t you think?
Do any of the other characters below make you do a double take?