Nathalie Sancoeur, known as Mayura, is the secondary antagonist of Miraculous: Tales of Ladybug & Cat Noir.
She helps Gabriel with his business.
She takes her job seriously, and is very strict with Adrien.
As a result, she wears a brooch known as the Peacock Miraculous, which when worn grant Nathalie the ability to transform into Mayura, her supervillian alias.
As the holder of a Miraculous, Nathalie is assisted by a small blue creature resembling a peacock called Duusu, who is a magical being known as a Kwami. As Mayura, Nathalie's signature ability is emotion.
- Entity creation: her special power, Amokization, allows her to create sentimonsters from one's emotions. She does so by infusing a feather with blue energy and sending to infect an object.
- Sentimonster control: she forced the sentimonster created by Wang Fu from eating her miraculous and destroyed her own sentimonster after it turned on her.
- Telepathy: she can speak to her amokized victims, similar to Hawk Moth when he akumatizes someone.
- Power enhancement: she takes an object and infuses it with scarlet energy, enabling her host to become stronger. She can also speak to the ones she's enhanced with a mask appearing on both her and the host's faces, similar to Hawk Moth's telepathy.
- Business intuition: she helps Gabriel in his business.
- Hand-to-hand combat: she took on the Punishers Trio without transforming into Mayura and held them off before being turned into a Reflekta clone and being paused by Lady Wifi.