Yes, there are quite a few. You can find them on popular fanfic platforms like Archive of Our Own. Some are really well - written, exploring the relationship between Felix and Adrien in unique ways, like how they might interact outside of the main plot of the show or how their family ties could influence their bond.
Well, Lila could be exposed when she tries to claim credit for something that the Miraculous heroes did. For instance, she says she helped Ladybug defeat an akuma when in fact she did nothing. Then, Tikki, Marinette's kwami, could find a way to let everyone know the truth. Maybe she uses her magic in a subtle way to make Lila blurt out the truth.
One possible scenario in a fanfiction could be that Lila finally realizes the error of her ways and decides to make amends with Marinette. She might see how Marinette's kindness has always been genuine despite her lies, and they could gradually become friends. This would be a big character development for Lila.
A really interesting fanfiction idea could be that Lila and Marinette switch personalities for a day. This would be a comical yet thought - provoking situation. Lila would have to deal with Marinette's responsibilities and kindness, while Marinette might struggle with Lila's devious ways. It could lead to both of them having a new perspective on each other.
One great Felix fanfiction is 'Felix's New Role'. It shows Felix in a new light, interacting with the other characters in a very interesting way. The author does a wonderful job of developing his character further than what we see in the show.
One possible scenario in a fanfiction where Lila is exposed could be that Marinette finally gathers enough evidence of all of Lila's lies. Maybe she records Lila admitting to her lies when she thinks no one is listening. Then Marinette presents this evidence to Adrien and their friends. They are initially shocked but then realize how they've been manipulated by Lila all this time.
One great Lila fanfiction could be one where she has a change of heart. Maybe she realizes the error of her ways after being exposed to real friendship. For example, in a story, Ladybug and Chat Noir could show her kindness despite her lies, which makes her question her actions and start to become a better person.
In many fanfictions about Lila and Adrien, their relationship can be quite complex. Sometimes, Lila tries to manipulate Adrien to get closer to his famous family or for her own gain. But Adrien, being the kind-hearted person he is, might initially be deceived by her lies, only to gradually realize her true nature as the story progresses.
There are multiple factors. First, the mystery surrounding Felix. His actions and motives are not always clear, and when paired with Adrien, it creates a lot of intrigue. Second, the contrast in their lifestyles. Adrien is a model and a superhero, while Felix has his own secrets. Fanfic writers can use this to create exciting plotlines, like Felix getting involved in the superhero world because of Adrien. Additionally, the emotional connection that can be built between them, whether it's friendship or something deeper, is also very appealing in these fanfics.
I really like 'Felix's Redemption'. In this fanfic, Felix starts off as a rather antagonistic character, but as the story progresses, his relationship with Adrian evolves. It's interesting to see how they come to understand each other better, especially in the context of the Miraculous Ladybug universe with all its magic and mystery.