Szilard's homunculus, though not his first creation. She was created to unthinkingly execute his every command; recently, however, she has been gaining emotions as well as independent thought, as a result of 'devouring' an alchemist threatening Szilard's life.

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She later helps Firo, giving him the necessary knowledge to destroy Szilard, and afterwards moves in with him as his roommate.

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Ennis eventually reciprocates Firo's feelings, marrying him in the 1980s and taking his surname 'Prochainezo'; two decades later, the couple honeymoon aboard the cruise ship Entrance in 2002, with Czeslaw tagging along.