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VY1 (ぶいわいわん, ブイワイワン, Yamaha Vocaloid 1) is a feminine voiced Vocaloid 2. An official character property of Bplats, Inc. and Yamaha. VY1 was updated for compatibility with Vocaloid 3 (ぶいわいわんぶいすりー).
There is no detailed article about Vocaloid VY1 here (Fanloid Wiki). If you're interested then you should follow the link to the Vocaloid Wiki to know more about this character.