Marinette Dupain-Cheng/History

Marinette Dupain-Cheng is a teenage girl who was chosen by Master Fu to wield the Ladybug Miraculous and become the superhero Ladybug. At first, she was reluctant to the job, but she gradually grew into the role.

Season 1
In "Ladybug & Cat Noir (Origins - Part 1)", on Marinette's first day of school in her last year of collège, Marinette woke up late. Worried about Chloé being in her class again for the fourth year in a row, Marinette did not want to go to school. Her mother reassured her that no one can be that unlucky and she would be fine. Marinette then lost what luck she had, spilling her breakfast and making a mess in the kitchen. When Marinette then left for school, she brought with her a box of macarons, nearly dropping them inside the house. As she waited at the crosswalk outside her home, she saw a man crossing the street and pulled him to safety, losing some of her macarons in the process and making her late to school.

Lo and behold, she was in the same class as Chloé once more, immediately being bullied by her to move seats. Alya saw this and helped Marinette, pulling her to sit next to her in class. Before Marinette could make it to her new seat, she tripped, spilling all but one macaron. Marinette split this macaron to share with Alya, the two becoming friends.

After the first class, Marinette and Alya were in the library when they saw the rock monster Stoneheart shouting for Kim. Alya rushed off, leaving Marinette behind. Marinette returned to her home, finding a small box in front of her computer. When she opened it, a flash of light entered the room and she met Tikki, a talking kwami for whom she was immediately afraid. Tikki convinced Marinette to put on the Ladybug Miraculous and to transform into a superhero. Afraid, Marinette did not want to be a hero, but with no way to remove the costume, Marinette left her room, swinging her yo-yo and flying out across Paris.

Still learning how to control the yo-yo, Marinette landed on Cat Noir while falling out of the sky. She followed after him to fight Stoneheart, still afraid and nervous. In the Parc des Princes, Marinette hesitated before joining the fight, accepting her role as Ladybug and helping Cat Noir take down Stoneheart with her Lucky Charm wet suit and turn him back into Ivan. She returned to her room before she detransformed. However, she forgot to capture the akuma. This failure on her end resulted in the akuma multiplying and infecting innocent Parisian citizens. Her confidence plummeted and she rejected the Ladybug Miraculous out of guilt. She took them off, hiding them in her vanity until she could give them away.

In "Stoneheart (Origins - Part 2)", the next day...

In "A Special Christmas", Marinette babysat Manon and helped her parents in their bakery by giving out Christmas logs to the customers who donated to Ladybug's and Cat Noir's charity fund. When Adrien's chauffeur walked in to take a Christmas log, Marinette ran to her room, grabbed the present she made for Adrien, and gave it to the driver to give to Adrien.

Around midnight, she received a phone call from Nathalie, informing Marinette and her family that Adrien was missing. Marinette's family went to search for Adrien while Marinette transformed into Ladybug. She found the results of Cat Noir's cataclysm and the note she left in Adrien's present. She then concluded an akumatized villain was after Adrien and that Cat Noir was protecting him. She followed the footprints she found in the snow and was eventually led to the Agreste mansion, where Adrien was outside the gates with a Santa Claus.

Assuming the Santa Claus was an akumatized villain, she attacked the Santa Claus. Her attacking him made him become an actual akumatized villain known as Santa Claws. Santa Claws dumped a present full of bats on Ladybug before running off, forcing her to chase him. She and Cat Noir chase him across Paris before they are flung into Alya's house. Ladybug summons her Lucky Charm (a box), takes some supplies from the Césaires, and sets up a trap at the Eiffel Tower, tricking Santa Claws and removing his akuma. After the damage caused by Santa Claws is fixed, Marinette and her family eat Christmas dinner at the Agreste mansion.