Board Thread:Off-Topic Discussion/@comment-24888118-20141222222136/@comment-5051846-20141222223918

It's not unexpected that voices and colours are going to be the most common things people ship Vocaloids for, without canon they're all we have to go on. orz If you're going to make up two fitting personalities for Vocaloids, why not make them up for Vocaloids with avatars which look good together, or sound good together? This is particulally relevant if you're a producer.

The most important aspect of a Vocaloid is its voice, at it's heart Vocaloid is a technical piece of software, so shipping for reasons which stem from qualities of sound is in a way shipping based on Vocaloid's essense. But other more random reasons for shipping aren't wrong either. c:

Basically, since we don't have much canon to give fans any 'deep' reasons to ship, you can choose couples for whatever reason you want. :D