Hatsune Miku will track the user with her head and eyes, follow them around and even interact with both the user and her environment — she casts a shadow, will disappear behind objects in front of her, and the video below shows Alsionesvx patting her, hitting her over the head and flipping her tie.
SF fans remember idoru from William Gibson's 1996 novel of the same name, which popularized Kyoko Date, a computer-generated person created by Visual Science Laboratory in 1996.
"...She is Tei Toei. She is a personality-construct, a congeries of software agents, the creation of information-designers. She is akin to what I believe they call a 'synthespian', in Hollywood."
Update 18-May-2021: See this earlier reference to the idea that computers can be used to create digital persons; Adam Selene from The Moon is a Harsh Mistress (1966) by Robert Heinlein.
End update.
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Gaia - Why Stop With Just The Earth?
'But the stars are only atoms in larger space, and in that larger space the star-atoms could combine to form living matter, thinking matter, couldn't they?'
Microsoft VASA-1 Creates Personal Video From A Photo
'...to build up a video picture would require, say, ten million decisions every second. Mike, you're so fast I can't even think about it. But you aren't that fast.'