The third Rozen Maiden doll, and Souseiseki's older twin. She and Souseiseki are both referred to as "gardeners" for their ability to communicate and tend not only to regular plants, but also to the "soul trees" of humans.Despite her attitude towards Jun, Suiseiseki does care a great deal for him, and her attempts to cover that up usually manifest in the form of more insults. In fact, she cares deeply for everyone in her life, even if she does not show it outwardly.
Source from Wikipeida
third, souseiseki's older twin, gardener, soul trees