Mercury

The unused blue superhero was a character from an old concept of Ladybug and Cat Noir (the Felix version) being in a team of superheroes with him, the unused male superhero, and the unused female superhero. Currently, it is unknown if the character exists in the Quantic Universe.

Trivia

 * The blue superhero's assumed civilian appearance has many similarities to Nino's appearance, including skin color, eye color, and headphones worn around the neck.
 * While an image of the blue superhero appeared in the first version of the Super Lady Luck slot game, he doesn't appear in the current version.