~Desu!

The third Rozen Maiden doll, and Souseiseki's older twin, they 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, she does care a great deal for him, and her attempts to cover that up usually manifest in the form of more insults. In Rozen Maiden träumend, Suiseiseki stands out among the dolls in that she values her sisters' love more than the goal of becoming Alice. She is one of the few dolls who opposes the Alice Game, and has no intentions of becoming Alice if it means taking her fellow sisters' Rosa Mystica. Suiseiseki and Jun attempt, without much success, to convince the other Rozen Maidens that the Alice Game is a meaningless endeavor. In her brief appearance in the OVA, she makes the same appeal to her twin several times.

Suiseiseki tries to avoid participating in the Alice Game as much as possible, but she can use her watering can to make plants emerge from the ground and manipulate them. Her artificial spirit is named after the popular Anna Sui perfume. Suiseiseki was also the winner of the Anime Saimoe Tournament in 2006.

Suiseiseki is a very prominent and popular character in the series. This is supported by the Internet meme involving images of her and the (over)use of the word "desu" (です, desu?). This meme came about because Suiseiseki ends almost all of her sentences with "desu". Most possibly for the sake of the meme, one fan has counted over 527 utterances of the word by Suiseiseki throughout the entire Rozen Maiden anime.