Shirosaki

The salesperson at the doll shop. He has a genuine passion for the dolls, even explaining dolls' feelings to Jun and Tomoe, but there is a sinister air about him. He is actually Laplace no Ma, the demon of Laplace. In Rozen Maiden öuverture, it is revealed that he has been in Enju's company since before Shinku and Suigintou's rivalry began, and was searching for Rozen Maidens even then, though it is not said why.

Source: Wikipedia