The Cat Miraculous is a ring that, whenever Plagg inhabits it, transforms the wearer into a black cat-themed superhero with the power of destruction and bad luck. The ring is currently owned by Adrien, who uses it to turn into Cat Noir.
The ring has a thick band with a circle surface surrounded by a lining with four pointed diamond shapes on each diagonal side. When Adrien isn't Cat Noir, the ring is silver and the circle is blank. But when Plagg enters the ring while Adrien transforms, it becomes black and a glowing green cat paw print appears in the circle. After Cat Noir starts running out of power, each toe of the paw print will disappear one at a time as an indication of how much power and time he has left until he turns back.
The Cat Miraculous grants its wielder incredible powers of superhuman speed, endurance, and strength. Its special weapon is a staff, which can be utilized as both a weapon and a communicator. Its special superpower is Cataclysm, which gives the user the ability to damage or destroy an object, like structures or metal bars. As long as the superpower isn't used, the wielder can remain transformed. However, as soon as the superpower is used, the wielder loses power and the transformation usually wears off in five minutes.
If the Ladybug Miraculous and the Cat Miraculous are used together, the holder will achieve ultimate power.
The person wielding them can make a wish that can alter reality. However, because universe must maintain balance, every action has a reaction, like a wish to become human resulting in someone losing their humanity.
List of owners
Ancient Chinese Cat Miraculous holder
A Cat Miraculous holder displayed in the Miraculous book.
A French teenage boy and the current Cat Miraculous holder. Given to him by Master Fu, Adrien is working to stop Hawk Moth and his supervillains.
The Great Guardian. He was storing the Cat Miraculous in the jewelry box before giving it to Adrien.
Order of the Guardians
The guardians of the Miraculouses. The order protected the Cat Miraculous until it fell apart.
In the theme song, the Cat Miraculous is in the raised center of the Miraculous jewelry box with the Ladybug Miraculous, both their sections creating a yin-yang symbol inside the box.
The Cat Miraculous is in the yang section (like in every yin-yang symboles there’s also both of them in each of them). Some of the things that yang represents is heat, light, dominance, and logic (which interpreted the Ladybug Miraculous).
Black cats are a symbol of bad luck, although they do symbolize good luck in some countries, like in ancient Egypt.
The ring can fall off while the user is transformed, which causes the user to revert back to normal.
In the original Ladybug PV, the ring has a very different design. It is entirely black with a cat face, the cat having green jewels as eyes and a red diamond-shaped jewel on its forehead.
Also, during the time the PV was produced and before the Miraculous theme was introduced, the ring brings bad luck to its holder — even when he or she is not transformed. Additionally, the ring can't be removed, but Félix Agreste is able to if he kisses Ladybug.
According to the official Miraculous Ladybug Tumblr blog, there will be more holders of the Cat Miraculous revealed.
If the person possessing the Cat Miraculous used it for evil, it would be "even more than [extremely dangerous]."
For a staged battle for Mr. Damocles as the Owl in "Dark Owl", Marinette creates a fake replica of the Cat Miraculous, which she later uses to trick Mr. Damocles' akumatized form and Hawk Moth.