Mullo is one of the supporting character from Miraculous: Tales of Ladybug and Cat Noir, and the kwami that is connected to the Mouse Miraculous and with her power, its wearer can use the pendant necklace to transform into a mouse-themed superhero, the current wearer being Mylène Haprèle.
She is voiced by Deneen Melody in the English version.
Mullo is a small mouse-like creature with gray ears, her eyes are pink.
Like the other kwamis, Mullo is very playful and immature. However, she can sometimes be compassionate, as shown in “Truth” and “Gang of Secrets” when she attempted comforting Marinette. Mullo can also take things seriously, as she tries communicating with Nooroo to help him in “Sandboy”, and sees akumatized villains as serious matters in “Truth”.
An example of her mischievous behavior is her delight in scaring others, as shown when Ladybug gives her Miraculous to Mylène and Mullo gives her a scare when summoned and laughs at it.
Like all kwamis, Mullo can fly, levitate, phase through solid objects, and carry things that are bigger than her.
Mullo can transform the holder of her Miraculous into a mouse-themed superhero by going inside their Miraculous.
As a kwami, Mullo gives the wearer the power and transforms them into a mouse-themed superhero by entering the Mouse Miraculous. Although unable to communicate to the wearer while they are transformed but can communicate to their transformed holders through their weapon-phones, Mullo usually knows what is going on during that time. Whenever the wearer uses Multitude, Mullo begins losing power and eventually can't retain the transformation any longer, leaving the pendant necklace and reverting the wearer back to normal. Mullo is exhausted and out of energy afterwards, so to be able to transform the wearer again, it must refuel by eating food.
Thousands of years prior to the series, Mullo and the other Kwamis traveled the universe, unable to interact with any creatures, particularly humans. This was until a mage forged the Miraculouses, so Mullo and the others could both interact with mankind and grant them the ability to transform into heroes; Mullo and the Mouse Miraculous able to give a person the ability to grant other people superpowers.
In "Kwamibuster," she temporarily uses the Mouse Miraculous to become "Multimouse" and becomes many forms like "Multifox," the fusion form of Marinette with both the Mouse and Fox Miraculous, "Multicat," the fusion form of Marinette with both the Mouse and Cat Miraculous, & "Multibug," the fusion form of Marinette with both the Mouse and Ladybug Miraculous, Master Fu remarks on how exceptionally, physically and mentally strong Marinette is to have used so many Miraculouses at once.
In "Strike Back", Félix summons Ladybug's yo-yo, allowing his uncle to steal Mullo's Miraculous and other of the Miracle Box (minus the Ladybug and Cat).
- Mullo is the kwami of Multiplication.
- She shares her English voice actress with fellow kwami Kaalki and miraculous holder, Vesperia.