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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Nano-Chainmail 2D Mechanically Interlocked Polymer
'Nemourlon armor of reasonable weight resists penetration by most fragments and any bullet that is not both reasonably heavy and fairly high-velocity.'
Humans Love Helping Other Species
'At the ringside opposite them a table had been removed to make room for a large transparent plastic capsule on wheels.'