Maybe Lila lies about having a special connection to Adrien's family, and Adrien has to figure out a way to expose her lies without causing too much chaos. It could involve some detective - like work on Adrien's part and some sneaky behavior from Lila.
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.
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.
One interesting plot could be the sister helping Adrien deal with his double life as a model and a superhero. For example, she might accidentally discover his secret identity and then work behind the scenes to keep it safe from Hawk Moth.
One common plot twist could be that the kidnapper is actually someone close to Adrien, like a jealous acquaintance who wants to get back at him for some perceived slight. Another might be that Adrien has a secret power or connection that the kidnappers are trying to exploit. Maybe he has a hidden family heirloom that they think is valuable.
Well, a plot could revolve around Adrien being akumatized when he discovers a dark secret about his mother. This could lead to his akumatized form having powers related to uncovering hidden truths and punishing those who have been lying. Or perhaps he's akumatized because he's tired of being in the shadow of Chat Noir. His akumatized self then tries to prove that Adrien is just as important as his superhero alter - ego. Also, he could be akumatized due to a betrayal from a friend, and his akumatized form focuses on isolating that friend from everyone else.
Maybe Emma starts to have dreams that are actually premonitions of future akuma attacks. She then has to convince Ladybug and Chat Noir that her dreams are real without revealing too much about herself. Or, she could find a way to create her own superhero identity and team up with Ladybug and Chat Noir, but struggles with the responsibility that comes with it as she is still a young girl.
Well, in Adrien Agreste depressed fanfiction, it often delves deep into his complex character. His depression could be due to his strict family life, especially his over - controlling father. Fanfiction writers might explore how he copes with his dual identity as a model and a superhero. They may show his isolation and how he tries to hide his true feelings from his friends.
A plot could involve Adrien being given the Peacock Miraculous by a mysterious figure. With this new power, he tries to use it to protect a loved one from a new, powerful enemy. However, the power of the Peacock Miraculous starts to affect his emotions and he has to learn to balance his feelings while using the miraculous effectively.
A possible plot is that Adrien is akumatized after his father is extremely harsh on him for not following the family's strict rules. His akuma form, 'Rebel Son', might have a look that combines his Chat Noir features with a more rebellious and angry look. Marinette could be akumatized when she's framed for something she didn't do at school. Her akuma form, 'Innocent Victim', would have a look of someone who has been wronged and is out for revenge.
Maybe their child gets sent back in time to when Adrien and Marinette were still just friends and classmates. The child then has to figure out a way to get back to their own time without changing the past too much. They might accidentally cause some comical misunderstandings between their parents - to - be in the process.
The theme of unrequited love can also be present. He might feel that Ladybug will never truly love him for who he is, especially when he is in a depressed state. This adds another layer of sadness to his character and the story.