Agatha is a young monster girl. She often acts playful, childish and friendly, but can switch to being sadistic and mean in moments. Agatha has a strong hatred towards Bierce, who feels the same, because Agatha was the maid's daughter Bierce sacrificed. She lives in her school in the underworld. She is capable of being nice when she feels like it. She looks up to the demon Malak, who is her father figure.