Do you ever wonder how Vocaloids were so human-like?
It's because at one time they were human. They were later slaughtered by "Master" and in the place of organs, he put robotic parts. The only human parts of them that remained were the brain and heart. He also changed their appearance a tad bit so no one would be suspicious.
He did this to lesser known singers so no one would miss them. He wiped their memories and gave them different names. He programmed them to do whatever he desired them to. Some of them were given lustful purposes, but that was reserved only for the prettiest of females.
So now you know what Vocaloids really are. This would explain why they don't know who their parents are (as said in Secret by Megurine Luka) and why they still have emotions. In fact, some of the Vocaloids are from the 1800's, for example, Kaito's genderbend Kaiko is very old. She's about 107, to be exact. Now be careful. For all you know YOU could be the next one to be slaughtered.
Don't look behind you.
