One plot idea could be that Lila tries to frame Adrien for something he didn't do, but Adrien manages to prove his innocence with the help of his friends. This would create a lot of drama and tension in the story.
Adrien might initially be a bit confused. Since fanfiction can deviate significantly from the 'official' story, he'd have to adjust to seeing his world and himself in new and unexpected ways. But as he reads more, he could become intrigued and start to really enjoy the unique interpretations.
If Adrien Agreste reads 'Le Papillon Rising' fanfiction, it could have several implications. Firstly, it might give him new perspectives on his own character and the events in his life. He could see how fans interpret his actions and relationships. Secondly, it might influence his self - perception, either positively or negatively depending on how the fanfiction portrays him. For example, if the fanfiction shows him in a heroic light, it could boost his confidence, but if it misrepresents him, it could be a bit disconcerting.
Their relationship could be developed uniquely by having Lila actually start to feel guilty about her lies when she sees how kind Adrien is. She might slowly try to change her ways, and Adrien, being the good - hearted person he is, could help her become a better person. This would be a very different take on their relationship compared to the usual animosity.
Maybe a mysterious new character in the fanfiction. This character could be from Adrien's family's past, someone with a vendetta against his family, and decides to start by getting Adrien arrested to disrupt the family. For example, if Adrien's family wronged this character's family long ago, they see Adrien as a target to take revenge on the whole family.
It could be Ladybug. If Adrien turns villain, Ladybug would be the natural antagonist as she represents the good side. Their relationship would be completely flipped from what it was before. She would have to try to stop him from causing more harm, all while probably still having some feelings for the old Adrien.
These fanfictions usually show Adrien with a lot of flaws. He might be painted as being manipulative, using his charm to get what he wants without considering the feelings of those around him. Sometimes, he is shown as being irresponsible, not taking his role as a superhero seriously enough. They really dig into the idea that he is not as perfect as he seems in the original series. They may also show him as being overly jealous, which can cause problems in his relationships. For instance, if he is jealous of another character getting close to Ladybug, he might act out in a negative way.
Nathalie might be a character in these fanfictions too. Given her role in Adrien's life in the original series, she could be involved in the events leading up to his akumatization. Maybe she accidentally triggers his negative emotions. And then there's Gabriel, Adrien's father. His actions or lack of actions towards Adrien could be a major factor in Adrien getting akumatized. So, he could be a key character in the fanfiction, either as someone who realizes his mistake and tries to help or as someone who makes the situation worse.
Well, it depends on various factors. If the fanfic is appropriate and within the bounds of legality and good taste, it could be seen as a normal form of enjoying fan - created content related to a character or story he likes. However, if the fanfic involves inappropriate or unethical content, then it would not be normal or acceptable.
If Adrien were Hawkmoth in fanfic, it could change the dynamics of the story completely. It might explore his internal conflicts and the impact on his relationships with other characters.