Nathalie Sancoeur

"Adrien, please reconsider! You know what your father wants!"

- Nathalie

Nathalie Sancoeur is Gabriel Agreste's assistant who manages his mansion and takes care of his son Adrien.

In "Catalyst", which is part of the "Heroes' Day" special, she is akumatized by Hawk Moth into Catalyst, a power enhancing supervillain.

In "Mayura", in order to help Hawk Moth escape from the French Miraculous superhero team, Nathalie uses the Peacock Miraculous and she when the Miraculous is inhabited by Duusu, becomes Mayura, a peacock-themed superhero who helps Hawk Moth create allies for akumatized villains and as Hawk Moth's "boss" in Season 3.

Physical appearance
Nathalie stands at an average adult height, and her eyes are a dull blue. Her hair is black and pulled back into a bun, and the hair on the right side of her head is dyed red.

Civilian attire
On her face Nathalie has glasses with black and red striped frames and on her eyes she has periwinkle eye shadow. She wears a red turtleneck sweater, a black dress jacket, black pants, and black high heel shoes. She also has round creamy white earrings.

As Mayura
Mayura's eyes have pink irises and sclerae that are pink which fade into dark indigo, and there is black liner around her eyes, resembling glasses. Her skin is a light indigo and her hair is dark blue, and part of it curls up underneath her left eye. She wears a peacock feather-like cocktail hat, being blue and tear-shaped with a light pink mark in the center and a light blue, translucent veil over her right eye. She wears a blue dress with a fuzzy black collar and sleeves that end in a point on the back of her hand. The dress appears to have a set hexagonal texture. The bottom of the dress has a front slit skirt, and the end of the skirt has rounded points with dark blue, light pink-centered spots, resembling a peacock's tail feathers. The rounded points are edged with translucent, light blue material. Underneath the dress, she has translucent indigo tights that are opaque from the knees down, making the opaque section resemble high heeled boots. She holds a blue hand fan, which is similar in design to the end of her skirt, and a peacock feather-like object in her other hand.

As Catalyst
Catalyst has periwinkle skin. Over her head, while leaving her mouth exposed, she wears a black helmet with a red visor with black edges and a red spike pointing towards the back of her head. Catalyst also wears a black dress suit with stiff shoulders, including a dark red front and swan neck collar that features a red downward arrow-shaped section in the center. The sleeves cover her entire arms, with the tips of her fingers fading into red. Also, Catalyst has pocket-like ridges on each side of her hips, and her pant legs come down to her feet, having red high-heels, soles, and tips.

Personality
Nathalie is serious and formal, working very diligently as Gabriel's assistant. She has a cold, distant demeanor, and she doesn't openly show her emotions around others most of the time. Smart and sensible, Nathalie is able to reason with Gabriel and Adrien whenever they are acting inconsiderately or emotionally, sometimes in relation to each other. While not warm, she can be cordial and polite. However, in situations where she is dealing with Gabriel, she gets nervous, afraid to disappoint him. Her desire to be on his good side leads her to unfair actions, like giving Adrien a birthday gift and claiming it is from Gabriel when it is actually from Marinette in "The Bubbler". She cares for Adrien, as she requests to Gabriel that his son goes to school on his behalf while she would handle his schedule, and she desires what is best for the Agreste family.

As Mayura
Mayura shares similar abilities with Hawk Moth, as seen in "Mayura". She is able to infuse a feather plucked from her hand fan with her power, which allows telepathic communication with the victim once it had possessed an object. It creates a creature from the victim's emotions that acts as its guardian. While communicating, a blue curved butterfly mask appears in front of both their faces, similar to Hawk Moth. Besides that, Mayura can seemingly create allies for akumatized villains, although how she does this specifically is still unknown.

As Catalyst
Catalyst has the power to multiply/enhance/increase powers, as seen in "Catalyst". When affected, the person gains a red-colored outfit. In Hawk Moth's case, with this power enhancement, he became Scarlet Hawk Moth and it allowed him to akumatize multiple butterflies. She can also communicate with the person she enhanced. While communicating, a red, sharp-edged butterfly mask appears in front of both of their faces, similar to Hawk Moth.

Gabriel Agreste/Hawk Moth


Nathalie works professionally as Gabriel's assistant. She makes sure to take care of all of his requests and looks after his son, Adrien. Occasionally, she tends to get nervous when dealing with him, such as when she forgot to buy a gift for Adrien on his behalf, leading her to lie and tell Adrien that Marinette's gift was actually from his father. Although wary of him becoming disappointed with her, she is willing to stand up to him for Adrien's sake, like voicing her displeasure with him for being too distracted by his missing wife to see his own son's misery during "A Christmas Special".

In "The Collector", it is revealed that Nathalie is aware that Gabriel is Hawk Moth. Furthermore, "Queen Wasp" indicates that she has deep feelings for Gabriel, relieved when he decides to stop being Hawk Moth but devastated when he changes his mind because he loves Emilie too much. Her loyalty is so strong that in "Catalyst", she helps with his plan for taking Ladybug's and Cat Noir’s Miraculouses by allowing him to akumatize her. She is so fiercely loyal to him that in "Mayura (Heroes' Day - Part 2)", she even risks herself by using the damaged Miraculous to transform into the titular villain in order to help Gabriel after he as Hawk Moth gets de-transformed back into his normal villain form.

Adrien Agreste/Cat Noir
Nathalie is usually serious around Adrien, not being very warm or close to him. Despite this, she does care for him, which she shows when she requests to Gabriel that Adrien should be allowed to go to school after seeing how much he wanted to attend. She also shows that she cares for Adrien in "A Christmas Special" when she sees how sad he is about his father not celebrating Christmas and asks Gabriel to spend time with his son. She even softly smiles at Adrien's joy at his friends being allowed into the mansion on Christmas.

Nathalie is unaware that Adrien is Cat Noir. However, she is fully willing to help Gabriel take Cat Noir's Miraculous for his own desires.

Marinette Dupain-Cheng/Ladybug
Nathalie has never met Marinette personally, only seeing her in person during the derby hat competition in "Mr. Pigeon". However, on Adrien's birthday in "The Bubbler", she treats Marinette formally when on a speaker, and she disregards Marinette by claiming Marinette's gift for Adrien was a gift from Gabriel.

Nathalie seems to respect Ladybug. She follows Ladybug's orders and assists her in protecting the Agreste mansion in "Simon Says". However, Nathalie is fully willing to help Gabriel take Ladybug's Miraculous for his own desires.

Trivia

 * "Sans cœur" means heartless or "without a heart" in French.
 * Nathalie appears to be left-handed, as she does most things with her left hand and is shown holding a stylus in her left hand during "Ladybug and Cat Noir (Origins - Part 1)".
 * Nathalie's akumatized form, Catalyst, was first revealed in a promotional video for Season 2 from TFOU.
 * Catalyst also shares a resemblance with to the Collector's design, as both have purplish skin, red glass over their eyes, and black dress suits with stiff shoulders.
 * Nathalie is the first character to explicitly be willingly akumatized (with Gabriel Agreste akumatizing himself in The Collector), although Lila Rossi's smirk after her de-evilization implies she may have also been willing to serve his scheme.
 * Catalyst is so far the only akumatized villian not to be defeated by the French Miraculous superhero team and the only one they are not aware of.
 * Mayura is the Sanskrit word for peacock, which is one of the sacred birds in Hindu mythology. It is also a contemporary Hindu name used in many parts of India.
 * While the villain is female, mayura is specifically the term for males, while mayuri is the term for females.
 * Mayura was revealed at the Miraculous panel at New York Comic Con 2016 under the name "Le Paon" (French for "The Peacock").
 * Earlier, at a panel at San Diego Comic Con, Thomas Astruc pointed to an image of her in the sneak peek collage image, commenting that she will be a new recurring supervillain that will be Hawk Moth's ally.
 * In a video interview held on August 25, Jeremy Zag mentioned that the new main villain will make Hawk Moth appear like "a baby" in comparison.
 * Her final name was revealed at a TF1 press conference advertising the upcoming Season 3.
 * Mayura's civilian identity was revealed by the end of Season 2.
 * There was also clues about her in the opening theme song for the season.

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