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The sinner you are referring to is a female demon who once allied with pandaemonium but later betrayed them. despite being a skilled scientist and having created the pocketwatch that sealed chrno's powers, she remains loyal to aion despite not agreeing with his methods. she enjoys spending time with children and is known for her cheerful demeanor. although she cares deeply for chrno, her loyalty towards aion prevents her from assisting him in any way.