Talk:Otori Kohaku/@comment-71.112.187.47-20190708035148/@comment-53539-20190708100357

The unity-chan models have been supplied by the company for free for a while and many use her for this reason unrelated to Vocaloid.

This isn't the only case of a non-Vocaloid becoming a Vocaloid, Lily and Macne Nana, as well as Macne Petit all were not Vocaloids first. Its a bit expanded upon if you also include the Voiceroid Tohoku Zunko.