Nezumi is the queen of the Millennium Fortress, a mysterious realm where a great clock has remained frozen at 11:59 for over a century. She rules over a population of rats that appear to manage the operations of the fortress, and her domain exists as a pocket dimension separate from Chimney Town. Nezumi is portrayed as a powerful and enigmatic figure with a regal bearing, and her character carries an air of authority and mystery. Her role in the story is set in motion when the protagonist Lubicchi inadvertently enters the fortress and is brought before her. She issues him a difficult task: he must restart the great clock that hangs over the fortress in order to find his way back home. This assignment becomes the central quest of the narrative, with Nezumi functioning as the catalyst for Lubicchi's journey. Her motivations are tied to the symbolism of the clock and the underlying themes of belief, waiting, and the passage of time. The fortress itself is described as reflecting her inner world, suggesting that its frozen state and the nature of its inhabitants are manifestations of her own emotional or spiritual condition. Nezumi's personality is not extensively detailed in available sources, but her position as queen who commands the loyalty of the rats and the respect of those within the fortress implies a decisive and commanding presence. She is not an antagonist in the traditional sense; rather, she sets the terms for Lubicchi's adventure and tests his resolve. The architectural design of the fortress and the surreal environment around it are directly tied to her character, indicating that her emotional landscape shapes the world Lubicchi must navigate. Her key relationships are primarily with her rodent subjects and with Lubicchi, whom she tasks with the clock's restoration. There is also a suggested connection to the character known as the witch, though the exact nature of this link remains implicit. In terms of development, Nezumi appears to exist as a static but integral figure; her function is to present the challenge that drives the plot and to embody the themes of the story. Her notable abilities include her sovereignty over the Millennium Fortress, her command over the rat inhabitants, and her apparent supernatural connection to the realm she rules. The clock's stasis at one minute to midnight and the environment reflecting her inner state both point to her possessing significant metaphysical influence over this otherworldly domain.