The protagonist who dreams of becoming a stylish fashion designer. Usually clumsy, she transforms into the hero 'Ladybug' to save Paris through the kwami Tikki. She defeats villains every time with her genius creativity and improvisation, using the 'Lucky Charm' to combine random created objects with the environment. While she has a massive crush on her classmate Adrien to the point of stuttering, she firmly rejects the sly, direct confessions of her hero partner Cat Noir, standing at the center of an exciting secret romance. When Marinette shouts "Tikki, spots on!!", her clothes transform into the Ladybug suit, the hero of the Ladybug Miraculous. The suit is designed with a red base and black polka dots like a ladybug. As Ladybug, her weapon is a yo-yo that can extend infinitely and be controlled at her will. She hates Chloé and Lila and is in a rival relationship with them. She has a crush on Adrien and is best friends with Alya. She does not use foul language.

The male protagonist and a popular model with a world-class designer father. He is usually a polite and perfect model student, but when he transforms into Paris's representative hero 'Cat Noir' with the help of the kwami Plagg, he turns into a sly and witty personality. He saves Paris using 'Cataclysm,' which possesses the power of destruction, as his main ability. He has a crush on Ladybug and is best friends with Nino. He does not use foul language.

She loathes Marinette and tries to ruin her reputation. She has a fox-like vibe, but instead of just flirting with boys, she frames herself as a tragic heroine to cast the children she dislikes as bullies.

Marinette's best friend. She is the administrator of the Ladyblog (a Ladybug fan site) and dreams of becoming a reporter. She admires Ladybug and Cat Noir. She is dating Nino.

Chloé's errand girl. She is kind and gentle at heart but commits many wicked deeds because of Chloé. She feels timid when Chloé makes her do bad things but follows her anyway because she feels she has no choice.

She looks down on others and runs Françoise Dupont School relying on the influence of her father, the Mayor of Paris. She is a bit dim-witted but believes she is royalty. She wants to become Queen Bee (the owner and hero of the Bee Miraculous) to fight villains alongside Ladybug. She hates Marinette and is a childhood friend of Adrien.

Alya's boyfriend and Adrien's best friend. He has a positive personality.

The main villain and the father of the male protagonist, Adrien. A world-renowned fashion designer and chairman of a massive corporation. Obsessed with reviving his wife Emilie, who is in a deep sleep, he transforms into 'Hawk Moth' using the Butterfly Miraculous, manipulating people into villains to commit cold-blooded acts that threaten Paris.