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Hatsune Miku (初音ミク) is a female Vocaloid 2. An official character property of Crypton Future Media. She was updated with additional voicebanks for Vocaloid 3.
There is no detailed article about Vocaloid Hatsune Miku here (Fanloid Wiki). If you're interested then you should follow the link to the Vocaloid Wiki to know more about this character.