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For money. Crypton started the 'Character Vocal' series, the first product being Miku. Crypton intended for her to be a cute female vocal that professionals can create from. Being the first young Vocaloid and having a cute design, she was a huge sucess leading Crypton to make Rin, Len, Luka, future appends, and the upcoming male vocal, CV04. This also resulted in making games based off her and having some apperances in animes.