Barasuishou

Barasuishou is a doll created by Enju, Rozen's apprentice, who introduces herself as the seventh Rozen Maiden doll at the start of Rozen Maiden träumend. This is a lie; she simply intends to dupe the other six Rozen Maiden into entering the Alice Game so that she may obtain their Rosae Mysticae and become the strongest doll.

(Source: Wikipedia)