she's not an ANIME woman
she's from a voicebank from a voice-synthesizing software although she was developed originally by Crypton studios but then bought by the producers of Vocaloid
she's technically only a voice so the image that is commonly associated with Miku is just a hold-in widely-recognized persona that is virtually interchangeable
her voicebank[s] have multiple languages but the main ones are Japanese, English, and Chinese