Gaspard's eccentric and nosy neighbor who provides comic relief and occasional assistance. She mistakenly believes Lula is Gaspard's girlfriend, accidentally starts a fire with a cigarette, and later impersonates a nurse to help Gaspard rescue the mermaid from the hospital.
Their neighborly connection gives Rossy access to Gaspard's private crisis.
Rossy is Gaspard's next-door neighbor and visits his apartment after Lula arrives.
Rossy moves from comic curiosity to practical support for Lula.
Rossy visits Lula, mistakes her for Gaspard's girlfriend, tells her about the Flowerburger, and later helps her escape.
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