Gabriel Agreste reveals that the Miraculous was damaged under unknown circumstances.
As of "Miracle Queen", Gabriel has repaired the Miraculous with the aid of Master Fu's tablet.
In its camouflaged form, the brooch looks like a peacock with the shape of a peacock's body and head at the bottom center and with nine light sea-green tail feathers coming out from it.
When charged, the brooch changes from nine feather segments to five. Its main color is dark blue, while the crystals on the top of each segment are pink. The lower part of the Miraculous also changes from the body of a peacock into a single teardrop.
As seen in "Ladybug", the actual damage to the Peacock Miraculous itself includes visible cracks on the back of the Miraculous.
The Peacock Miraculous grants its wielder superhuman characteristics of speed, endurance, and strength.
Its main ability consist on bring someone's emotions to life in the form of a sentimonster, who is often resembled as a magical beast created and controlled by a feather turned into an amok. The cause of this is mostly to get the target out of a crisis. The wielder can form a telepathic connection between themself and their target. The wielder of the Peacock has the power to retrieve the Amok, making the sentimonster it created disappear as fast as it had appeared in the first place, and to purify the feather they originally charged with energy.
Peacocks are a symbol of integrity, vision, and vibrancy.
As seen in "The Collector", the Miraculous spellbook has a depiction of the Peacock Miraculous in which is blue and has five tail feathers. However, in "Mayura", the Peacock Miraculous uses the five-feathered design when inhabited by Duusu, and the nine-feathered design when in its disguised form.
As noted during an event with the writers, it was "weird" that Plagg didn't recognize it when he and Adrien looked inside the safe in "Volpina".
It has been confirmed that the jewel stored in the safe at that time wasn't the real Peacock Miraculous, merely a copy created by Gabriel. However, the Peacock Miraculous shown in "Mayura" is clearly the real Miraculous, shown by it being in its charged state, which is activated by having a kwami in its Miraculous.
The Peacock Miraculous is currently "damaged," according to Gabriel Agreste, which results in it causing an adverse effect upon its holder when being used. This is demonstrated by Nathalie coughing and fatigued as result of using it.
Since Miraculous jewels are negatively impacted when a Kwami transforms its owner while holding another object, it could be possible Duusu was absorbed with another object.
In "Reflekdoll", the Peacock Miraculous malfunctions between its camouflage and charged state when Nathalie activates it before her transformation.