Marc Anciel

"But what if [Nathaniel] doesn't like it? I'll be so embarrassed. I'll have to change schools so I'll never run into him again."

- Marc Anciel

 is a student at Collège Françoise Dupont. In "Reverser", after Nathaniel disregards him and his writing, he is akumatized by Hawk Moth into Reverser, an inverting supervillain.

Physical appearance
Marc is at average height with messy black hair, jade green eyes, thick eyebrows, pink lips, and a slender face with a pointed chin.

Civilian attire
He wears a red hooded jacket with white drawstrings and a white section on the back of the hood. It is lined with pink material. Underneath is a multi-colored rainbow V-neck shirt. He also appears to wear black fingerless gloves, ripped dark grey jeans with silver studs along the pockets and around the waist with a silver buckle, and black boots. His nails are painted black and he has a black choker around his neck.

As Reverser
Reverser is in a checkerboard patterned outfit. The left side of the outfit has solid black markings, like on the upper head, arm, fingers, chest, torso, and leg. On the right side, the lower head, palm, teeth and half of a circle on the chest are black. Reverser's weapon is a white and black paper plane that can reverse the abilities or the personality of the person who is hit. He rides on a triangular paper plane-like object.

Personality
Like Juleka, Marc is very shy and nervous around others. This is shown when Marinette pulls Marc into the art room to introduce him to everyone. He is also quite shy in front of his first friend at the school, Marinette, refusing to show her his stories. He likes to write stories (particularly about Ladybug and Nathaniel) but is sheepish and self-conscious when people read them. When he runs away in embarrassment out of the art room, he drops his notebook and Marinette picks it up and reads it. When she hands the notebook back to him later on, Marc immediately turns red. Like Marinette, he is clumsy and kind.

As Reverser, Marc is demanding and clever: realizing that Ladybug's graceful agility made her difficult to strike, he endangered civilians in order to make Ladybug an easy target when she went to help the affected cyclist. He is also confident, leaning on a bit overconfident: after he struck Ladybug and Cat Noir with his arrows, he saw them as no threat and believed he had time to obtain his revenge on Nathaniel and Marinette before dealing with them.

As Marc
He is an excellent creative story writer. His Ladybug stories, based on Nathaniel's drawings, impress Marinette (the real Ladybug) so much that she pushes him to work with Nathaniel to make the Ladybug/Mighty Illustrator comic. Since the two of them complete the comic, it is implied that his writing skills are strong enough for him to write well in script style as well as in short story style.

As Reverser
Reverser rides on a large paper airplane, which has the ability to fly around at will. He can also make small black and white paper airplane "arrows" with the ability to change a personality trait to its opposite, by calling out what trait he wishes to reverse. Primary examples are when he made Ladybug become extremely clumsy after hitting her with a paper plane, or when he made Cat Noir a coward. This can also affect specific actions, as Reverser was able to make André Bourgeois bring the trash containers in space back to Earth.

Nathaniel Kurtzberg
Marc often looks at Nathaniel's drawings online and uses them for inspiration for his stories. He is delighted when he gets a chance to see them in person. When Marinette suggests showing Nathaniel his writings so they can make a comic book together, Marc fears what might happen if Nathaniel doesn't like his stories, so he takes Marinette's offer of showing the book without saying who wrote it. But when Nathaniel angrily rejects Marc's offer of making a comic book together after mistakenly believing that the latter was playing a joke on him, Marc gets so upset that he is akumatized by Hawk Moth. However, after he is deakumatized, the misunderstanding is cleared up and the two create a comic book together. They can be seen together in later episodes such as Frozer and Mayura. In Frozer, as Adrien is looking at each of the school's couples, Nathaniel and Marc are seen sitting on the staircase together looking at a book. In Mayura, Nathaniel places his hands on Marc's shoulders as they all cheer for Marinette which shows that their bond has deepened and that there is a high level of trust between the two. It was also confirmed on twitter by Feri that it is obvious that Marc has a "fondness" or feelings for Nathaniel by the way he acts around him and talks about him.[8] [9]

As Reverser, he seeks revenge on Nathaniel for the emotional pain caused by his rejection. His intent is to reverse Nathaniel into being willing to make the comic book.

Marinette Dupain-Cheng/Ladybug
Marc appears to be on good terms with Marinette, but he is shy about showing his writings to her. Regardless, he takes her advice of teaming up with Nathaniel to create a comic book and allows her to give Nathaniel his writing without saying who wrote it. However, after a misunderstanding, Marc believes that Marinette is meddlesome and a liar. After he is deakumatized, though, he is no longer mad at her and along with Nathaniel dedicates their first Ladybug comic book to her.

As Reverser, he targets Marinette, believing (partly correctly) that it is her fault that Nathaniel rejected him. His intent is to reverse her into being hated by everyone, though when Marinette dodges his reversion airplane, Xavier Ramier gets reversed so that his pigeons hate him.

Marc appears to be a fan of Ladybug and often writes stories inspired by her fights against akumatized villains. In "Frightningale," he wears a Ladybug mask, confirming that he is a fan, though it is unknown when the events of "Frightningale" occur relative to the events of "Reverser" and "Queen Wasp."

As Reverser, however, he doesn't like her interfering with his plans. His strategic talent leads him to realize that he can force her into a vulnerable situation by targeting innocent bystanders, making her defend them.

Trivia

 * Marc makes his first appearence in "Frightningale" as a dancer for Clara Nightingale's music video alongside Nathaniel, Mylène, Ivan and Sabrina.
 * His first name was revealed in a UK episode synopsis on May 19, 2018.
 * His akumatized form was first seen in a photo taken by Jeremy Zag of the show's production for Season 2.
 * On May 21, 2018, Thomas Astruc revealed on Twitter that a (at the time unspecified) character was based on Hope Morphin, a personal friend of his who is genderfluid and bisexual.
 * A few hours after "Reverser" premiered on Family Channel, Morphin revealed that the character Astruc was referring to was Marc, and also that Marc is androgynous. Feri González also confirmed Morphin's statements about Marc.
 * Feri confirmed on Twitter that Marc identifies as part of the LGBTQ+ community and has "fondness" for Nathaniel.
 * Marc been akumatized because of Marinette Dupain-Cheng and Nathaniel Kurtzberg.
 * His full name, Marc Anciel, is a wordplay on the French word "arc-en-ciel", which translates as "rainbow" in English.
 * This word play references the rainbow pattern on his outfit and hints towards him being a part of the LGBTQ+ community.
 * Aside from his resemblance to Morphin, Marc's feminine appearance was used to indicate that he is androgynous and was also a hint towards him being LGBTQ+.

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