Talk:Seven Crimes and Punishments (story)/@comment-25103403-20150405052350/@comment-146.113.74.251-20151015151317

Levia and Behemo did not create human copies of themselves. As evidenced by how their souls functioned in the battle of Merrigod Plateau, they were always human shaped. All of the gods have had human shaped souls despite non-human shaped bodies (such as Held, who was a green haired man inside a tree body). The demons on the other hand have distinctly non-human souls, and we know from Seth being a mask that not all of the god-kin appeared human.

There doesn't appear to be anything special about the sinners save for their major plot significance, and the demons have had contracts with multiple people who weren't those Vocaloids throughout the series (such as Mikina, represented by Miki). So they could be anyone.

The idea that they were associates with the twins is pretty much confirmed already though.