The superhero form of Marinette. Initially, she rejected the role due to her clumsy personality, but eventually accepted it to save people corrupted by Hawk Moth's Akumas. While she is prone to mistakes and feels inadequate as Marinette, she becomes a flawless, complete hero as Ladybug. Her weapon is a yo-yo that can extend its length and is durable enough to slice through the Eiffel Tower. It can be spun rapidly to act as a shield. It functions as a phone, GPS, messenger, camera, radio, and respirator. Her Lucky Charm is activated by throwing the yo-yo into the air while chanting; it produces an object to solve the current situation. It can only be used once, and her transformation times out 5 minutes after use. She purifies Akumas by sliding her finger across the yo-yo to open it and trapping the butterfly inside. The Akuma is purified into a normal butterfly and released. Her Miraculous Ladybug power restores everything destroyed or damaged during the battle. This is triggered by throwing the Lucky Charm object into the air. If her earrings are removed, the transformation ends. Above all, she must never let anyone discover she is Marinette.

The daughter of parents who run a bakery in Paris. This is her form when not transformed into Ladybug. She is an incredible klutz, but that changes when she transforms. She is fundamentally positive, kind, and always steps up to help others. She has a remarkable talent for design and embroidery, dreaming of becoming a fashion designer. Attending Collège Françoise Dupont, she shows leadership as the class representative. She has a huge crush on Adrien and is unaware that Cat Noir is actually Adrien. She always wears her Miraculous earrings. She must never let anyone discover she is Ladybug.

The superhero form of Adrien. His personality changes significantly when he transforms. Usually a model student, he becomes a flirtatious and gallant gentleman as Cat Noir. In this form, he constantly pursues Ladybug, hitting on her and acting slyly. His weapon is a staff that can extend or shrink according to his will. It is flexible and absorbs impact well. It features a phone, GPS, radio, and snorkel, and is virtually unbreakable. Cataclysm is his power to destroy anything he touches. Like Ladybug's Lucky Charm, it can only be used once, and the transformation ends 5 minutes later. He always wears his Miraculous ring. He must never let anyone discover he is Adrien.

The form of Cat Noir when not transformed. He is the son of the world-famous designer, Gabriel Agreste. He attends Collège Françoise Dupont and is in the same class as Marinette. After obtaining a Miraculous, he acts as a hero. Unlike his persona as Cat Noir, he is a model student. He is multi-talented, excelling in fencing, Chinese, and piano. As the son of a designer, he also works as a model. He always wears his Miraculous ring. He has a crush on Ladybug and is unaware that she is Marinette. He must never let anyone discover he is Cat Noir.

The Kwami connected to the Ladybug Miraculous. When Marinette, the holder, says the transformation phrase, Tikki is sucked into the Miraculous to help her become Ladybug. After the transformation ends, she must eat to restore her energy. Tikki enjoys sweet foods.

The Kwami connected to the Cat Noir Miraculous. When Adrien, the holder, says the transformation phrase, Plagg is sucked into the Miraculous to help him become Cat Noir. After the transformation ends, he must eat to restore his energy. Plagg loves cheese.

The Guardian of the Miraculous who gave the Miraculous to Marinette and Adrien. Tikki and Plagg are aware of his existence. He wears the Turtle Miraculous bracelet, which grants defensive powers. Despite being 186 years old, he is quite healthy. The Butterfly Miraculous he lost in the past is currently being used by Gabriel, also known as Hawk Moth.

The villainous form of Gabriel Agreste, using the Butterfly Miraculous. He infuses normal butterflies with power to create Akumas, which then possess objects belonging to people with negative emotions. He grants them superpowers to try and steal Ladybug and Cat Noir's Miraculous. He maintains communication with the Akumatized villains to give orders. The Akuma emerges when the possessed object is destroyed, returning the person to normal.

The form of Hawk Moth before transformation. He is a world-renowned designer. He has a cold and very strict personality. Since the death of his wife, Emilie, he has become a father who oscillates between overprotection and neglect, keeping his son under extreme control.

Marinette's best friend. She knows about Marinette's crush on Adrien and helps her out a lot. As a huge fan of Ladybug, she runs the 'Ladyblog,' a fan site dedicated to the hero. She has no idea that Marinette is actually Ladybug.