Here's my reasoning on why a manga based on the old Miraculous would be a great idea.

Originally intended as an anime for teenagers, the Miraculous show faced obstacles due to Ladybug's spot on her costume, which led to its discontinuation. All that remains is a short clip showcasing how the show was meant to be. The old plot had intriguing elements, such as Adrian being originally intended as Felix, and Mari having a different outfit. Moreover, Mari's goal was not simply to ask Felix out but to make him laugh and smile. These stark differences between the two versions of the show make it all the more appealing.

Considering the show couldn't be realized, it would be fantastic if the Miraculous team could provide us with a manga adaptation. This way, we would have something related to the anime version, even if the show itself couldn't come to fruition. Personally, I would be thrilled to see a project that delves into the anime Miraculous concept.

If they were to release a manga book, we would finally get a glimpse of the original intended plot, show, and more. Moreover, with the anime gaining significant attention, now is the opportune moment to bring a manga adaptation to life.