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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LLM 'Cognitive Core' Now Evolving
'Their only check on the growth and development of Vulcan 3 lay in two clues: the amount of rock thrown up to the surface... and the amount of the raw materials and tools and parts which the computer requested.'