Suigintou (Mercury Lampe / Mercury Lamp) is the first of the Rozen Maiden dolls.
- She likes Megu's singing voice, as she asked her to complete her song.
- She made Megu her Master and vowed to be with her until death, putting a ring on Megu's finger to contractually bind them together.
- She was concerned about saving Megu after she was snatched away by Kirakishou in Rozen Maiden:Zurückspulen.
- She is showing to be concerned after she saw an unconscious Megu being stroked by Kirakishou, and she has a violent outburst and demands to have Megu given back to her when Kirakishou taunts her.
- In episode 6 of Rozen Maiden:Zurückspulen she complemented Megu.
- In Tale 63 of the second Manga, Suigintou and Megu mutually profess their love for each other.
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