Suigintou is the first doll of the Rozen Maiden collection. Her desire to win the Alice Game is the strongest of all the dolls, and is primarily driven by her wish to gain the attention of their "Father", the fantastic dollmaker Rozen. Sadistic, spiteful, and arrogant (all due to her spectacular inferiority complex), Suigintou has no inhibitions when it comes to the Alice Game. She will use any method available to her, regardless of how brutal it may be, to reach victory. Although she avoids socializing with all of her sister dolls, she has a particularly strong hate for Shinku. However, upon meeting Megu, her medium, Suigintou's attitude and motivations begin to shift; she begins to feel a strong affection for someone other than "Father", and a will to fight for something other than the honor of becoming "Alice", the perfect girl. Suigintou's desire to protect Megu begins to even overpower her wish to meet "Father," and she hopes to use the collected Rosa Mystica, not to become Alice, but to heal Megu's heart ailment instead. However, Suigintou fails in this endeavor, discovering to her horror that she has used up Megu's energy.
Initially, Suigintou's will to exist was so strong that she was able to move without actually possessing a Rosa Mystica. Suigintou did not consciously make a contract with Megu, rather, Megu came upon Suigintou as she was reawakening. Suigintou's strong sense of independence, as well as disdain towards humanity, had her avoiding the perceived weakness of having a medium. She is also the only Rozen Maiden to have been defeated and revived three times.
Suigintou has a number of unique traits and flaws amongst the seven Rozen Maiden. In the anime, she is missing her torso; Shinku explains at one point that before Suigintou was completed, her design was erased, but gives no further explanation as to why or how. In Ouverture, it is shown that Rozen abandoned her half-completed form in two parts on his worktable. She was never assembled--although her clothing was completed--and as such, not initially given the life force that is a Rosa Mystica. It was her love for Rozen that brought her to life, and she crawled off of the table to seek him out. Rozen does later provide her with a Rosa Mystica, only after she is sliced in half by Souseiseki and presumably fated to fade out of existence. Curiously, after Suigintou is destroyed in battle by Shinku at the end of the anime's first season, she is restored midway through Rozen Maiden Träumend. The identity of the person responsible for her restoration is never revealed, however it is strongly implied to be Rozen. In the Rozen Maiden Träumend finale, she tells Shinku that "Father" had told her that even with her flawed body, she is also entitled to a part in the Alice Game. Later, Rozen is seen lovingly fixing her neck ribbon as she is sleeping. He even grips her gently around the waist afterwards, implying that he has mended her incomplete body.
In the manga, her body is flawed by wings--notably, she is the only Rozen Maiden with them--that have ravaged her back with cracks. Despite these flaws, her love for "Father" and willpower is so strong that she can use her powers independently of a medium.
Along with her artificial spirit, Meimei, Suigintou's weapons are her ragged black wings. With their arrow-like feathers, she can conjure up a shield, a large sword, or even twin black dragons. Suigintou can also create destructive blue flames as a last resort in battle. The variety in Suigintou's abilities, particularly when combined with her savagely cunning nature, make her a strong player in the Alice Game.
Her artificial spirit, "Meimei," is named for the Japanese word "Mei", meaning darkness.