Board Thread:General Discussion/@comment-77.104.247.254-20141101133815/@comment-53539-20150512063310

"counterparts" is what your looking for... Which just means they were built to compliment each other. Like Prima/Tonio, Leon/Lola and the VY duo.

Miku is from the CV series and is not based on the shame direction as them... In fact, the pair weren't CFM vocaloids originally.