In many fanfictions where Marinette can fly, it often gives her a new level of confidence. For example, she might use her new ability to quickly get to akuma battles and surprise the villains. She could also use flying to have some peaceful moments above Paris, away from the daily chaos. It adds a really interesting dynamic to her character as she already has so many responsibilities as Ladybug.
One possible scenario in such a fanfiction could be that Marinette discovers her flying ability by accident. Maybe it's a side - effect of a new Miraculous power she gains. Flying would allow her to better protect Paris as she can reach any location faster. She could also use it to visit her friends more easily, like dropping in on Alya's balcony without having to climb up.
Well, in fanfictions about Marinette flying in Miraculous Ladybug, it might change the power dynamics between her and Chat Noir. With the ability to fly, Marinette as Ladybug could potentially take on more solo missions. This might lead to some interesting storylines where Chat Noir feels a bit left out at first, but then they find a new way to work together with Marinette's new - found flying skills.
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