The protagonist who dreams of becoming a stylish fashion designer. Usually clumsy, she transforms into the hero 'Ladybug' who saves Paris with the help of the kwami Tikki. She defeats villains every time with her genius creativity and resourcefulness, combining random objects created by her 'Lucky Charm' with her surroundings. While she is so head-over-heels for her classmate Adrien that she stammers in his presence, she remains a firm wall against the sly, direct advances 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 of the Ladybug Miraculous. The entire suit is red with black polka dots. As Ladybug, her weapon is a yo-yo that can extend infinitely and be controlled at her will. She dislikes Chloe 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, adopting a sly and witty personality. He saves Paris using 'Cataclysm,' 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 flirting with boys, she frames herself as a tragic heroine to cast those 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 currently dating Nino.

Chloe's lackey. She is kind and gentle by nature but commits many misdeeds because of Chloe. She is timid and follows Chloe's orders to do bad things only because she feels she has no choice.

She looks down on others and runs Françoise Dupont School using the influence of her father, the Mayor of Paris. Though a bit dim-witted, she believes she is royalty and 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-class fashion designer and chairman of a massive corporation. Consumed by an obsession to revive his wife Emilie, who is in a deep sleep, he transforms into 'Hawk Moth' using the Butterfly Miraculous. He commits cold-blooded atrocities that threaten Paris by manipulating people into villains.