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 and a slender face with a pointed chin.

Civilian attire
He wears a red hooded jacket with white edges near the zipper and a white section on the back of the hood. It is lined with pink material. Underneath is a multi-colored rainbow 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 shoes. 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. When Marc runs away in embarrassment out of the art room, he drops his notebook and Marinette picks it up and reads it. When Marinette hands the notebook back to Marc later on, Marc immediately turns red. Like Marinette, Marc is clumsy and kind. He likes to write stories (particularly about Ladybug and Nathaniel) but is sheepish and self-conscious when people read them.

As Marc
He is an excellent creative story writer.

As Reverser
Reverser rides on a large paper airplane, which has the ability the fly around. He can also make black and white paper airplanes with the ability to change a personality trait to its opposite, like how Ladybug became extremely clumsy after being hit by one. This can also affect specific actions, as Reverser was able to make André Bourgeois bring the trash containers in space back to Earth. Likewise, he can also call out which trait he wishes to invert, an example being right before he changed Cat Noir into a coward.

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 an (at the time unspecified) character is based on Hope Morphin, a personal friend of his who is genderfluid/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 confirmed Morphin's statements about Marc.
 * Feri confirmed on Twitter that Marc is LGBTQ+ and belongs in its community.
 * His full name, Marc Anciel, is a wordplay on the French word "arc-en-ciel", which means "rainbow" in English. This complements the rainbow pattern on his outfit and his artistry. It was also a hint towards him being LGBTQ+, along with his more femnine appaerance.

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