|Major Spoiler Warning|
This page contains major spoilers from an episode(s) that has not aired in the US yet.
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.
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”.
Mullo can fly, levitate, and phase through solid objects. She can also carry objects that are larger and/or heavier than herself.
As a kwami, Mullo is able to transform the holder of the Mouse Miraculous into a mouse-themed superhero.
Mullo can grant the wielder of the Mouse Miraculous the power of Multitude, which allows them to shrink down and split themselves into multiple miniature clones, and fuse back into one. The smaller individuals can also fuse powers with other kwamis and create hybrid wielders (such as Multifox, Multinoir, and Multibug).
Before Season 2
When the concept of multiplication came into existence, Mullo came into existence. Before the Miraculous jewels were created, she 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.
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. She 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 ended up contacting his wielder instead. Upon hearing his voice, the kwamis shuddered at the thought of being his slave and prevented themselves from being discovered they all cut off the connection. They realized if they contacted Nooroo's wielder, rather than l Nooroo, then someone must have been akumatized and that Tikki's and Plagg's wielders would be in danger.
During Season 3, Mullo was dormant in the Mouse Miraculous.
In "Kwamibuster", after Tikki and Plagg had been captured by the titular villain, Mullo's Miraculous was activated by Marinette so she could become Multi Mouse. Along with the other kwamis, the powers of Multitude, and the fusion of some other Miraculouses, they were able to save Tikki and Plagg, deakumatize Ms. Mendeleiev and keep the heroes' identities safe. Upon dividing Mullo, the other kwamis praised Ladybug as the plan was a success and returned to the Miracle Box and Master Fu.
In "Miracle Queen", Mullo were activated alongside Stompp, Roaar, Ziggy, Daizzi, Barkk, Orikko, and Fluff, by Queen Bee with the intent to use them against Ladybug and Cat Noir. After being commanded to transform her, they collectively withheld their transformation phrases to prevent Queen Bee from abusing their power. Upon hearing Master Fu renounce his title, they and the others protest, but Master Fu does so anyway, resulting in the Miracle Box changing shape and form. After failing to escape, Queen Bee throws off their respective Miraculouses, and they, alongside their kwamis, are returned to the Miracle Box by Ladybug.
In "Truth", Mullo was accidentally released from the Miracle Box when Marinette tried to figure it out. In her eagerness, she stole Tikki's hat with Tikki chasing after her. During a video call on his new guardian's computer, Mullo and the others surrounded the screen in amazement. When Marinette leaves for her date with Luka, Mullo and the other kwamis hid with the Miracle Box. After the titular villain's defeat, Mullo and the others saw that Marinette was sad about breaking up with Luka to the point of tears. She didn't know exactly how to help but joined with the other kwamis in giving their new guardian a group hug.
In "Lies", Mullo was seen with Xuppu and came across an apple by Marinette's computer. Trying to play with it, Mullo dropped it on the keyboard. She and Xuppu couldn't agree on how to move it and stepped on the keyboard changing the screen.
In "Gang of Secrets", Mullo was seen talking with the other kwamis until their guardian arrives home. Later, she hears Marinette voicing her distress about being condemned to a life of secrets and lies forever because of her alter ego. When they hear someone coming, the kwamis hide in the Miracle Box, and after the Gang of Secrets has been defeated, Mullo and the others look on as Marinette unveils her secret to Alya.
In "Furious Fu" hearing that Master Fu was returning, Mullo along with the other kwamis expressed dear desire to see him despite Marinette trying to keep them hidden for their safety, and when his new guardian voiced concerns about leaving the Miracle Box unguarded, Mullo realized if someone stayed to guard the box, the others could go. When they cheated their way out so all of them could go, they were stopped by Marinette. With no other choice, they used the "puppy dog eyes" on her, and Marinette reluctantly agreed. However, Mullo and the kwamis had a hard time keeping quiet while in Marinette's bag but heard that Master Fu is doing well and had become a great painter.
Returning home, Mullo realized that Su-Han had returned to reclaim the box as he was the previous guardian before Master Fu's incident. With Su-Han's strictness, they sadly returned to the box. After seeing Ladybug's valiant actions against the titular villain, Su-Han realized that Master Fu's choice wasn't so bad, allowing Mullo and the others to stay with Marinette.
In "Queen Banana", Mullo along with Daizzi was helping Marinette as she added the finishing touches to a pair of costumes she was making for a class movie project.In "Optigami", when Marinette received an invite to Audrey's event; Mullo and the other kwamis were excited to go to but was reminded by her guardian no owner, no leaving.
|Miraculous: Tales of Ladybug & Cat Noir Theme Song:||Absent|
|1. "Santa Claws":||Absent||14. "Frightningale":||Absent|
|2. "The Collector":||Absent||15. "Syren":||Absent|
|3. "Prime Queen":||Absent||16. "Zombizou":||Absent|
|4. "Despair Bear":||Absent||17. "Frozer":||Absent|
|5. "Riposte":||Absent||18. "Style Queen":||Absent|
|6. "Befana":||Absent||19. "Troublemaker":||Absent|
|7. "Robostus":||Absent||20. "Queen Wasp":||Absent|
|8. "The Dark Owl":||Absent||21. "Reverser":||Absent|
|9. "Gigantitan":||Absent||22. "Anansi":||Absent|
|10. "Glaciator":||Absent||23. "Malediktator":||Absent|
|11. "Sapotis":||Absent||24. "Sandboy":||Appears|
|12. "Gorizilla":||Absent||25. "Catalyst":||Absent|
|13. "Captain Hardrock":||Absent||26. "Mayura":||Absent|
|Miraculous: Tales of Ladybug & Cat Noir Theme Song:||Absent|
|1. "Chameleon":||Absent||14. "Stormy Weather 2":||Absent|
|2. "Animaestro":||Absent||15. "Kwamibuster":||Appears|
|3. "Bakerix":||Absent||16. "Feast":||Absent|
|4. "Backwarder":||Absent||17. "Reflekdoll":||Absent|
|5. "Gamer 2.0":||Absent||18. "Ikari Gozen":||Absent|
|6. "Weredad":||Absent||19. "Desperada":||Absent|
|7. "Silencer":||Absent||20. "Startrain":||Absent|
|8. "Oni-Chan":||Absent||21. "Timetagger":||Absent|
|9. "Miraculer":||Absent||22. "Cat Blanc":||Absent|
|10. "Oblivio":||Absent||23. "Félix":||Absent|
|11. "Party Crasher":||Absent||24. "Ladybug":||Absent|
|12. "Christmaster":||Absent||25. "Heart Hunter":||Absent|
|13. "The Puppeteer 2":||Absent||26. "Miracle Queen":||Background|
|Miraculous: Tales of Ladybug & Cat Noir Theme Song:||Appears|
|1. "Truth":||Appears||?. "Mega Leech":||Unknown|
|2. "Lies":||Appears||?. "Crocoduel":||Unknown|
|3. "Gang of Secrets":||Background||?. "TBA":||Unknown|
|4. "Mr. Pigeon 72":||Absent||?. "TBA":||Unknown|
|5. "Furious Fu":||Appears||?. "TBA":||Unknown|
|6. "Sole Crusher":||Appears||?. "TBA":||Unknown|
|7. "Queen Banana":||Appears||?. "TBA":||Unknown|
|8. "Guiltrip":||Absent||?. "TBA":||Unknown|
|9. "Optigami":||Appears||?. "TBA":||Unknown|
|10. "Sentibubbler":||Unknown||?. "TBA":||Unknown|
|11. "Rocketear":||Unknown||?. "TBA":||Unknown|
|?. "Psychomedian":||Unknown||?. "TBA":||Unknown|
|?. "Gabriel Agreste":||Unknown||?. "TBA":||Unknown|
- Mullo was first revealed from a second season trailer on August 31, 2017.
- Mice are symbols for many things, including success, ambition, kindness, and resourcefulness.
- The mouse is the first animal of the Chinese zodiac.
- Mullo's name is a reference to mulot, a French word for "field mouse."
- Mullo's name was originally "Toppo" (based on the Italian word for mouse, topo) before being changed during development.
- Mullo's original name was accidentally used in one scene of the English dub of "Kwamibuster".
- Mullo's Miraculous has the most unification transformations.
- Mullo is currently tied with Tikki who also has three unification transformations.
- Along with Orikko, Mullo is also the only known kwami who does not have a speaking role until Season 4 as she remained in the background in both Seasons 2 and 3.
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