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The tsundere third Rozen Maiden doll.
The third of the Rozen Maidens and older twin to Souseiseki, these two are referred to as "the Gardeners" because of their weapons: Souseiseki has scissors for pruning, and Suiseiseki has a watering can for growing. Instead of regular plants, however, these are designed for tending to human "soul trees." Suiseiseki is the first of the dolls to suggest that they don't need to play the Alice Game-- that they can live happily and peacefully as they are. It is probably due to her distaste for the idea of fighting with Souseiseki that led to this conclusion.
MangaSouseiseki originally fights with Suiseiseki in order to acquire her watering can so that she can obey her master's desire, for Souseiseki to invade the dreams of his brother's lover to get revenge for stealing him away. In the end Souseiseki realizes her mistake and sacrifices herself to save her master, which has a profound effect on Suiseiseki. In the confusion, Suigintou steals Souseiseki's Rosa Mystica, enraging Suiseiseki.
AnimeSouseiseki and Suiseiseki live together with an elderly man who uses Souseiseki as a replacement for his dead son. Suiseiseki eventually fears for Souseiseki's sense of self and sanity, and goes to Shinku and Jun to escape and for advice. She remains a regular visitor to Jun's house and eventually moves in with the others.
Suiseiseki has a bossy and uncaring outer demeanor, but it's a thin veneer. She cares deeply for her sisters and particularly for Jun. In spite of her prickly exterior she is perhaps the most fragile of the dolls.
She is also an odd mix of rude and polite, often ending her insults with the word "desu" (which is a relatively formal verb to tack on). This resulted in Suiseiseki's Internet nickname "Desu," and she remains one of the most popular anime character memes online.