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Hatsune Miku does not have a brother as far as officials say. If Miku does have any brothers, it is most likely that you saw a fanmade. Sometimes the Vocaloid product line (E.g. Miku, Rin, Len, Luka etc) is regarded as being a family.

The following may be
  • Hatsune Mikuo (初音ミクオ) - A genderswap of Miku created by the fandom, his design is similar to Miku, only he has short hair and wears pants.

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