Mullo

 is a kwami who is connected to the Mouse Miraculous. With their power, its wearer can use the Miraculous to transform into a mouse-themed superhero. They are currently dormant in their Miraculous in Wang Fu's Miracle Box, as seen in "Sapotis".

Appearance
Mullo is 10 centimeters (or 4 inches) tall and is light gray with a small body, two whiskers and a thin tail. She has pink eyes and gray ears with the insides being pink.

Abilities
Mullo can fly, levitate, and phase through solid objects. She can also carry objects that are larger and/or heavier than them.

As a kwami, Mullo is able to transform the holder of the Mouse Miraculous into a mouse-themed superhero, although it is unknown what the transformation looks like or what powers the transformed person gains.

Before Season 2
Before the Miraculous jewels were created, Mullo and the other kwamis traveled all over the universe unable to interact with humans. Thousands of years ago, a mage created the Miraculouses. When their Miraculous was not being worn, Mullo was dormant in the Mouse Miraculous, which was stored inside the Miracle Box.

Season 2
During Season 2, Mullo was dormant in the Mouse Miraculous.

In "Sandboy", Mullo was celebrating Nooroo's birthday in the Miracle Box with the other kwamis, and they were excited when Tikki and Plagg arrived. The kwami marveled at the gift Tikki brought, a marker, and played with the other kwamis. When it came the time to find Nooroo, Mullo got into position in an effort to contact him, but the kwamis contacted his wielder instead. Hearing his voice, the kwamis shuddered at the thought of being his slave and prevented them from being discovered when they all cut off the connection. They realized if they contacted Nooroo's wielder, rather than Nooroo, then someone must have been akumatized, and Tikki and Plagg's wielders would be in danger.

Season 3
During Season 3, Mullo was dormant in the Mouse Miraculous.

Trivia

 * Mullo was first revealed from a second season trailer on August 31, 2017.
 * Thomas Astruc revealed their name on Twitter on November 11, 2018.
 * Mice are symbols for many things, including success, ambition, kindness, and resourcefulness.
 * The mouse🐭(鼠) is the first animal of the Chinese zodiac.
 * Mullo's name is a reference to mulot, a French word for "field mouse."

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