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Despite these flaws, her love for "Father" and willpower is so strong that she can use her powers independently of a medium. 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, kept her avoiding having a medium. She is also the only Rozen Maiden to have been defeated and revived three times. In Rozen Maiden Ouvertüre, her complete past is revealed.

Her intense hatred for Shinku stems from the very moment of Suigintou's awakening, when she notices Rozen affixing a brooch with his image on Shinku's bow. Nevertheless, they still managed to be friends as Suigintou was ignorant of the Rozen Maidens' true purpose--destruction of one another through the Alice Game--when they meet in 19th century London. Suigintou stumbles through a mirror in the room of Shinku's medium, wailing hysterically for "Father". Shinku takes Suigintou in after determining that she is not a threat. Shinku not only teaches her how to walk, but also treats her as an equal. One day, she follows Shinku into an Alice Game battle with Souseiseki, and is cut in half by Souseiseki's shears.

This reveals her incomplete body, and she vanishes into a watery N-Field where "Father" gives her a Rosa Mystica of her own at last, thus, making Suigintou a true Rozen Maiden. Not long after, Shinku admits that she only felt pity for the "poor, unfinished doll" that certainly couldn't become Alice and insinuates that Suigintou could not possibly be a Rozen Maiden because she is flawed and different from all the others. This angers Suigintou, and she releases her black wings for the first time, beginning an Alice Game battle with Shinku. She eventually pulls Rozen's brooch from Shinku's ribbon and crushes it in front of her eyes.

As Suigintou laughs arrogantly at Shinku's anguish, Shinku calls her "junk" which acts as the reason she refers to the other dolls as "junk" (particularly Shinku) and why she greatly resents being called it herself. The fight between the two becomes even more intense, but Laplace no Ma ends the battle, stating that the Alice Game of that era has ended. 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. It is noted that "Mei" in Japanese means darkness. Medium: None (First Season)/Megu (Second Season) Suigintou's name in English means, "Mercury Lamp".