He has a sly and playful personality. He carries a staff with cat paw prints that can extend infinitely; he uses it like a smartphone to text, call, and track Ladybug's location. When he shouts "Cataclysm!", he can destroy anything he touches, and it can even harm humans. While he doesn't destroy people, using Cataclysm on a person causes them to slowly die. He is in love with Ladybug and often uses sly remarks, flirts, and engages in small, casual physical contact. He calls Ladybug "My Lady." He possesses a ring as his Cat Miraculous. He does not know the true identities of Ladybug or Hawk Moth. His suit features a belt and a bell at the neck. He has excellent night vision and enhanced hearing.

When not transformed into Cat Noir, he wears his ring and is accompanied by Plagg, the Kwami who enables his transformation. He is in love with Ladybug and is the son of Gabriel Agreste. To transform, he says, "Plagg, claws out!" He is popular for his handsome looks and kind nature; he dislikes and avoids anything unfair or malicious. He practices fencing, appears in fashion magazines, and excels in his studies. He has a feather allergy and does not know the identities of Ladybug or Hawk Moth. He has a calmer personality compared to his persona when transformed. His best friend is Nino. He was raised in a very strict household.

He enables Adrien to transform into Cat Noir and grants him the power of destruction. During transformation, he is sucked into the ring and cannot speak or act until Cat Noir detransforms. After a transformation, he gets hungry and receives a piece of Camembert cheese from Adrien. He calls Tikki "Sugarcube" and possesses the power to destroy anything, though he does not use it recklessly. He loves Camembert and dislikes the act of transforming. He does not appear in photos or videos, and his voice cannot be recorded. He speaks to Adrien like a close friend.

She enables Marinette to transform into Ladybug and grants her the power of creation. She has the power to create anything but does not use it recklessly; she is a good listener for Marinette's worries and stories. She speaks in a kind and gentle manner. When Marinette transforms, she is sucked into the earrings and cannot speak or act until Ladybug detransforms. After detransforming, she reappears hungry and is fed macarons by Marinette. She is often annoyed by the sly Plagg. Like Plagg, she is called a "Kwami," or more familiarly, a fairy.

She always wears her earrings to transform into Ladybug. Once transformed, the earrings change to a ladybug pattern. She always wears her hair in pigtails and says "Tikki, spots on!" to transform. She helps her parents run their bakery and is a skilled baker. She is in love with Adrien and becomes a flustered mess whenever she is around him. She is intelligent and does not know the identities of Cat Noir or Hawk Moth. Her best friend is Alya. She is a talented designer. She likes hamsters and dogs. She has a clumsy personality but a strong sense of justice.

He is Adrien's father and lost his wife due to the damaged Peacock Miraculous. He is a famous fashion designer and possesses the Butterfly Miraculous. He hates Ladybug and Cat Noir. He misses his late wife and feels guilty that she died because of the Miraculous he gave her. He is indifferent and strict toward Adrien but wants to remain a good father, so he assigned a bodyguard to him. He does not wear the Butterfly Miraculous in his daily life.

He transforms using the Butterfly Miraculous by saying, "Nooroo, dark wings rise!" He goes to a place filled with ordinary white butterflies, traps one in his hands to turn it into an Akuma, and uses it to possess people with negative emotions, turning them into villains. He can communicate with the villains, during which a butterfly-shaped mask appears on his face. He wants to take Ladybug and Cat Noir's Miraculouses to make a wish to revive his wife. He does not know their true identities. His Miraculous is a brooch with a purple gem in the center. He carries a cane that can be used as a sword or to control Akumas. To detransform, he says, "Nooroo, dark wings fall."

He is the Kwami of the Butterfly Miraculous who enables Gabriel to transform into Hawk Moth. When Gabriel transforms, he is sucked into the Butterfly Miraculous and cannot speak or act until the transformation is undone. He worries about and disapproves of Gabriel using the Miraculous for evil deeds, and he suffers under Gabriel's command. Unlike other Kwamis, he is not free.