|NOTICE: To avoid spreading unwanted spoilers to users outside the US, this page will hold out spoilers of the second half of Season 2 about Nathalie until the special "Heroes' Day" is released in the US. To see the spoilers about the second half, click here.|
|“||Adrien, please reconsider! You know what your father wants!||”|
—Nathalie, "Ladybug & Cat Noir"
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.
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 CatalystCatalyst 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.
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.
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.
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.
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 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".
|Miraculous: Tales of Ladybug & Cat Noir Theme Song:||Absent|
|1. "The Bubbler":||Appears||14. "Princess Fragrance":||Absent|
|2. "Mr. Pigeon":||Appears||15. "Ladybug & Cat Noir":||Appears|
|3. "Stormy Weather":||Absent||16. "Stoneheart":||Appears|
|4. "Timebreaker":||Absent||17. "Animan":||Absent|
|5. "Copycat":||Absent||18. "Simon Says":||Appears|
|6. "The Pharaoh":||Absent||19. "Pixelator":||Absent|
|7. "Lady Wifi":||Absent||20. "Guitar Villain":||Absent|
|8. "The Evillustrator":||Absent||21. "Kung Food":||Absent|
|9. "Rogercop":||Absent||22. "Gamer":||Absent|
|10. "Dark Cupid":||Absent||23. "Reflekta":||Absent|
|11. "Horrificator":||Absent||24. "The Puppeteer":||Absent|
|12. "Darkblade":||Absent||25. "Antibug":||Absent|
|13. "The Mime":||Appears||26. "Volpina":||Appears|
|Miraculous: Tales of Ladybug & Cat Noir Theme Song:||Absent|
|1. "A Christmas Special":||Appears||?. "Zombizou":||Absent|
|2. "The Collector":||Appears||?. "Syren":||Appears|
|3. "Prime Queen":||Absent||?. "Frightningale":||Appears|
|4. "Despair Bear":||Absent||?. "Troublemaker":||Absent|
|5. "Riposte":||Absent||?. "Reverser":||Absent|
|6. "Befana":||Absent||?. "Anansi":||Absent|
|7. "Robostus":||Absent||?. "Sandboy":||Absent|
|8. "The Dark Owl":||Absent||?. "Style Queen":||Appears|
|9. "Gigantitan":||Absent||?. "Queen Wasp":||Appears|
|10. "Glaciator":||Appears||?. "Malediktator":||Absent|
|11. "Sapotis":||Absent||?. "Frozer":||Background|
|12. "Gorizilla":||Appears||?. "Catalyst":||Appears|
|13. "Captain Hardrock":||Appears||?. "Mayura":||Appears|
|"Marinette in Paris":||Absent||"Marinette and Adrien":||Background|
|"Marinette and Fashion":||Background||"Master Fu":||Absent|
|"Ladybug as seen by Adrien":||Absent||"Tikki":||Absent|
|"Adrien's Double Life":||Appears||"Friends":||Absent|
|"Marinette and Alya":||Absent||"Nino":||Background|
|"Marinette's Double Life":||Absent||"Max":||Absent|
|"Cat Noir as seen by Marinette":||Absent||"Mylène":||Absent|
|"My Birthday Party":||Absent||"Rose":||Absent|
|Super Lady Luck:||Absent||Miraculous Mission Ladybug:||Absent|
|Throwdown!:||Absent||Ladybug Contra os Vilões:||Absent|
|Miraculous Ladybug & Cat Noir:||Pictured|
- "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, although Lila Rossi's smirk after her de-evilization implies she may have also been willing.
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