Nathalie Sancoeur, later known as Mayura, is the secondary antagonist of the Miraculous franchise, appearing as the secondary antagonist of the French superhero cartoon series Miraculous: Tales of Ladybug and Cat Noir, a supporting antagonist in the Miraculous World specials, and will appear in some capacity in the upcoming musical film Ladybug & Cat Noir Awakening. She is the assistant of Gabriel Agreste/Hawk Moth, and aids him in his quest to steal the Miraculouses of Ladybug and Cat Noir. She later starts using the Peacock Miraculous to further assist Hawk Moth, gaining the ability to create Sentimonsters; creatures made from the emotions of those she targets. In the episodes "Catalyst" and "Ladybug", she is Akumatized into Catalyst, a villain capable of enhancing Hawk Moth's powers.