User blog comment:AngelWings13/Is there any vocaloids that are a only child?/@comment-4238265-20130715215445/@comment-5057772-20130716003922

She looks 15 in her reference sheet. And I guess if you count VOCALOIDs that are from the same company as family then VOCALOIDs that don't have siblings are; Piko, Rion, SeeU, MAYU, and if Akikoloid-chan and Ueki-loid count then them too.