This is also the reason why she is the "Hatsune". The creations of the eldest sister Miko Kaine and the eldest brother Haito Kaito failed to bring great influence. It is precisely because of Hatsune Miku's The birth made VOCALOID widely known, so she is the 1 and the starting point. Later, Kagamine’s twin arms were numbered 2, and Megurine’s arms were numbered 3