This page is for a concept/character/etc. that didn't become, isn't considered, or hasn't been confirmed canon in the Miraculous Ladybug Quantic Universe continuity.
Mercury was a character from the old, unused concept of Ladybug and Cat Noir being in a team of superheroes called the Quantic Kids. He is seen with Melodie and Sparrow, the other members of the team. However, the concept was discarded, and so Mercury never appeared outside concept art.
As a superhero, Mercury had dark blue/purple skin with white lightning bolt-like markings on where his eyebrows would be and on top of his head. In Thomas Astruc's early designs for him, his body had lightning bolt-like lines with light blue edges all over his body, meeting up and through dots on the back of his hands, shoulders, elbows, torso, and knees. His feet appeared to have had white shoe soles.
In concept art, it appears that Mercury had super speed.
|Miraculous: Tales of Ladybug & Cat Noir Theme Song:||Absent|
|1. "Chameleon":||Absent||14. "Stormy Weather 2":||Absent|
|2. "Animaestro":||Absent||15. "Kwamibuster":||Absent|
|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":||Toy Version||24. "Ladybug":||Absent|
|12. "Christmaster":||Absent||25. "Heart Hunter":||Absent|
|13. "The Puppeteer 2":||Absent||26. "Miracle Queen":||Absent|
|Super Lady Luck:||Older Version||Miraculous Mission Ladybug:||Absent|
|Throwdown!:||Absent||Ladybug Contra os Vilões:||Absent|
|Miraculous Ladybug & Cat Noir:||Absent||Miraculous Crush:||Absent|
- While an image of Mercury appeared in the first version of the Super Lady Luck slot game, he doesn't appear in the current version.
- He appeares as an action figure in "Party Crasher". Since Majestia, Knightowl, and Sparrow also both have action figures and exist in the Quantic Universe, it is possible he maybe a superhero existing in this universe.