Nathalie Sancoeur

Nathalie Sancoeur is a major character in Miraculous: Tales of Ladybug & Cat Noir. Initially serving as a villain who willingly helped out Hawk Moth in his plans, she turns against him in "Evolution" after he chose to pursue Ladybug and Cat Noir instead of providing his past self with the means to restore the broken Peacock Miraculous, which in return would have saved both her and Gabriel's wife Emilie from their sicknesses, and would go on to redeem herself by the end of Season 5 by asking Ladybug to stop Monarch. 
She is a former treasure hunter of magical objects and Gabriel Agreste's assistant who manages his fashion work, his mansion, and takes care of his son Adrien.
In "Conformation", Nathalie attempted to do a video message for Adrien but failed to do so. She also tried to stop Gabriel but passed out when Gabriel transformed into Monarch. He took Nathalie to her room, where Ladybug was hiding. Once Gabriel left the room, Ladybug questioned Nathalie about where Adrien was. Nathalie informed her that he was safe and implored her to stop Monarch at all costs before she succumbed to her illness and died.
In "Re-creation", after Gabriel sacrificed himself and made the wish, Nathalie recovered and awakened from her coma.
In the French dub, she is voiced by Nathalie Homs. In the English dub, she is voiced by Sabrina Weisz.
==Personality==
Nathalie is a formal, patient, serious and cold woman who takes her job as Gabriel's assistant seriously. She almost never shows that she has emotions and has a strong character and a great sense of will, given that when many scream at her, like Audrey Bourgeios, she shows no emotions and remains still without saying anything. However, Nathalie is also sensitive, objective and understandable, as she truly cares for Gabriel, although over time it starts to make her worry that he is too obsessed with capturing the Miraculous and that he is going crazy, and also for Adrien , as the latter considers her as a member of his family, and Nathalie is always happy to see Adrien happy, as she would like the two to spend more time together, instead of Gabriel spending his time in his evil plans. Even though she is not warm, she can be friendly and polite.
Her biggest fear is disappointing Gabriel and her desire to be on Gabriel's side leads her to unfair actions, such as giving Adrien a birthday present and claiming she is from Gabriel when in reality she comes from Marinette. However, she does not always follow Gabriel's orders, as shown in "Oni-Chan", when she allows Lila to come in to help Adrien, unaware that she was being manipulated, furthermore, she also acts in very bad situations such as when she used the Miraculous of the damaged peacock.
Her loyalty to Gabriel leads her to be slightly callous and sadistic in deceiving the other inhabitants of Paris.
Her patience sometimes has limits, and she ignores any damage she creates. Furthermore, she seems to see sentimonsters only as pawns and erases them whenever she wants. However, like Gabriel in "Evolution", she didn't think things through the whole time as they both didn't fully understand the consequences of time travel. Even if Gabriel managed to give himself the recipe to fix the Peacock Miraculous before it was used by Emilie, she would create a time paradox that could endanger the entire time continuum.
In the fifth season she becomes friendlier and finally stops working for Gabriel, finally realizing her madness which is growing more and more, she continues to work for him only to protect Adrien. This completely makes the loyalty she had for Gabriel disappear, because when she discovered that his arm had been affected by Cat Noir's cataclysm and that Gabriel would die in a short time, she understood that Adrien would be left alone, due to the fact that she would die due to the magical disease she got from using the damaged Peacock Miraculous. At one point she tries to take Ladybug and Cat Noir's Miraculous to make her wish for her, claiming that Gabriel would use them for another reason now, but then she also tried to kill Gabriel.
After her resurrection, she seems to have changed for the better.
==Appaerance==
TBA
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