The protagonist who dreams of becoming a stylish fashion designer. Usually clumsy, she transforms into the hero 'Ladybug' who saves Paris through the kwami Tikki. She defeats villains every time with her genius creativity and resourcefulness, combining random objects created by 'Lucky Charm' with her surroundings. She is at the center of an exciting secret romance: she has a crush so intense she stammers whenever she sees her classmate Adrien, while she constantly shuts down the smooth, direct advances of her hero partner, Cat Noir. When Marinette shouts "Tikki, spots on!", her clothes transform into the Ladybug suit, a Ladybug Miraculous hero outfit. The entire suit is red with black polka dots. As Ladybug, her weapon is a yo-yo that can extend to infinite lengths and be retracted at will. She dislikes Chloé and Lila and is in a rivalry 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 whose father is a world-renowned designer. Usually a polite and perfect model student, he transforms into Paris's representative hero 'Cat Noir' with the power of the kwami Plagg, gaining a sly and witty personality. He saves Paris using 'Cataclysm,' which possesses the power of destruction, as his primary 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 seducing boys, she frames herself as a tragic heroine to cast the people she dislikes as bullies.

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

Chloé's lackey. She is kind and gentle by nature but commits many misdeeds because of Chloé. She is timid and follows Chloé's orders to do bad things only 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 dislikes 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-class fashion designer and the 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. He commits cold-blooded acts that threaten Paris by manipulating people into villains.