The Moth Miraculous, also called the Butterfly Miraculous, is a brooch that, whenever Nooroo inhabits it, transforms the wearer into a moth-themed superhero with the power of generosity. The brooch is currently owned by Gabriel Agreste, who uses it to transform into Hawk Moth for evil purposes — specifically, creating supervillains who attempt to steal Ladybug's and Cat Noir's Miraculouses.
When not transformed, the brooch is oval-shaped and its front is purple. It opens up like a locket, in which an image can be placed. The edges of the brooch and the back of the front part are gray metal, some of it branching out on the outer area of the front of the brooch. When Nooroo inhabits the Miraculous, it becomes a dark purple button, with four light pink strands of fabric coming out from it, making it resemble a butterfly or moth.
The Moth Miraculous grants its wielder the ability to sense positive or negative emotions in order to precisely pinpoint a targeted person's identity. Able to sense various people and their emotions, the wielder usually targets a person with the strongest emotions for the best manipulation. While able to sense emotions, the holder cannot read minds.
Akumatization is the Moth Miraculous' superpower. The wielder can energize a butterfly, which turns it black and into an akuma, to be sent to possess an object of the person. Then, the Moth Miraculous holder is able to communicate with the person to offer him or her powers. Once they accept, they transform into super beings. In addition, the wielder can telepathically connect to the akumatized person to talk with them and perceive what that person perceives. If the akumatized person is using their powers wrongly or not the way the holder wants them to, the holder can cause pain to the akumatized person by controlling the person's body to a certain extent, or take away their powers. In "The Collector", it is revealed that Moth Miraculous holders can akumatize themselves; to do it, however, they need to first create an akuma and then give up the possession of their Miraculous.
These powers, however, do have their limitations. Hawk Moth appears to only be able to make one akumatized villain at a time, and it seems that he must wait for some amount of time between creating villains.
In "Ladybug & Cat Noir", the inactive Miraculous is large enough to sit in its bearer's palm and contain a photo, but in "The Collector", the inactive Miraculous is notably smaller, being the same size as the active one is without wings.
The Moth Miraculous is currently the only known Miraculous that is being used for evil.
Although it has yet to be seen, people feeling insufficient emotion can decline to become akumatized, such as those targeted by Hawk Moth if they don't despair enough.
Wang Fu mentions in "Ladybug & Cat Noir (Origins - Part 1)" that he thought the Moth Miraculous had been lost forever.
As revealed by Thomas, Season 2 will explain how Hawk Moth found the Miraculous after it was lost.
The Moth Miraculous' user is seemingly immune to the effects of the Akumatized villains, as he was not trapped in one of the Bubbler's bubbles despite being an adult, nor was he turned into a knight from Darkblade's barrier.
However, this does not apply when the Miraculous is inactive, as shown in Simon Says.