Duusu

Duusu is a minor antagonist/anti-hero in the animated series Miraculous: Tales of Ladybug and Cat Noir. She is the kwami of the Peacock Miraculous, who helps anyone who possesses it to transform into a peacock-themed superhero. Although desiring to use her powers only for good,

Past
Thousands of years prior to the series, Duusu and the other Kwamis travelled the universe, unable to interact with any creatures, particularly humans. This was until a mage forged the Miraculouses, so Duusu and the others could both interact with mankind and grant them the ability to transform into heroes; Duusu and the Peacock Miraculous able to give a person the ability to grant other people superpowers. However, Master Fu eventually ended up making an (unspecified) mistake that resulted in the Guardian's Temple being destroyed and the Moth Miraculous, Peacock Miraculous and Miraculous Spellbook being lost, Duusu along with them. Decades later, through unknown means, Gabriel Agreste acquired all three items.

Season 2
In "Sandboy",

Season 3
In "Reflekdoll",

Trivia

 * She and Nooroo are the currently the only known kwamis who have fallen into the hands of a villain.
 * She's the only kwami known at the time who didn't appear in Season 2.
 * Her name may be based on the Serbian and Croatian word "duša", meaning "soul."