The superhero form of Marinette. Initially, she rejected the role, citing her own clumsiness, but eventually accepted it to save those infected 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 with an extendable string that is durable enough to slice through the Eiffel Tower. It can be spun rapidly to serve as a shield. It functions as a phone, GPS, messenger, camera, radio, and rebreather. Her Lucky Charm is activated by throwing the yo-yo into the air and chanting the spell, producing an object to solve the current crisis. It can only be used once, and her transformation ends 5 minutes after use. She purifies Akumas by sliding her finger across the yo-yo to open it and capturing them inside. The Akuma is purified into a normal butterfly and released. Her Miraculous Ladybug power restores everything destroyed or damaged during the fight. It 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 her identity as Marinette be discovered.

The daughter of parents who run a bakery in Paris. This is her appearance when not transformed into Ladybug. She is incredibly clumsy, 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 designer. Attending Collège Françoise Dupont, she shows leadership as the class representative. She has a crush on Adrien and is unaware that Cat Noir is actually Adrien. She always wears her Miraculous earrings. She must never let anyone find out 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 sly. His weapon is a staff that can extend and retract at will. It is flexible, absorbs shock, and includes functions like a phone, GPS, radio, and snorkel. It is incredibly durable and unbreakable. Cataclysm is his power to destroy anything he touches. Like Ladybug's Lucky Charm, it can only be used once, and his transformation ends 5 minutes later. He always wears his Miraculous ring. He must never let anyone find out he is Adrien.

The civilian form of Cat Noir and the son of 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. Being 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 find out he is Cat Noir.

The Kwami connected to the Ladybug Miraculous. When Marinette, the wearer, says the transformation phrase, Tikki is pulled 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 wearer, says the transformation phrase, Plagg is pulled 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 and the one 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, utilizing the Butterfly Miraculous. By infusing normal butterflies with power to create Akumas, he sends them to inhabit objects belonging to people with negative emotions. He grants them superpowers to try and steal Ladybug and Cat Noir's Miraculous. He maintains constant communication with the Akumatized villains to give orders. The Akuma emerges when the object is destroyed, and the person returns to normal.

His form before transforming into Hawk Moth. 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 extreme overprotection and neglect, keeping his son under tight 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.