One possible plotline could be that Lila spreads false rumors about Marinette at school, causing Marinette's friends to doubt her at first. For example, Lila might say Marinette stole something from her, which makes everyone look at Marinette suspiciously.
In some fanfictions, Lila might try to steal Marinette's friends completely. She could organize exclusive events and not invite Marinette, while also bad - mouthing her to the others. This would make Marinette feel isolated and she'd have to fight back to regain her friendships.
Marinette, as Ladybug, could use her wits and courage. She could outsmart Lila in a public situation. Let's say Lila tries to embarrass Marinette at a big event, but Marinette, using her Ladybug - like charm and intelligence, turns the tables and reveals Lila's true nature to everyone.
Well, it could be that Lila has managed to turn the teachers against Marinette too. In fanfiction, she might be so good at manipulating that she convinces the school staff that Marinette is a troublemaker. This, combined with the students' negative attitude towards Marinette due to Lila's lies, could lead Marinette to decide that moving schools is the best option.
Perhaps Pepper, in an attempt to protect Tony from himself, takes extreme measures. For example, she could sell off Stark Industries' technology that Tony was using for his Iron Man suits without his consent. This would be a huge betrayal in Tony's eyes as his technology and the Iron Man identity are so closely tied to him. It could lead to a rift between them that is difficult to mend as Tony feels violated and Pepper believes she was doing the right thing to keep him safe.
Another plotline could be based on a misunderstanding. There could be some false information spread about Elizabeth that makes Meliodas believe she has betrayed him or the group. So, in his anger and disappointment, he hurts her. For instance, if he hears that she's made a deal with an enemy, without getting all the facts straight, he might confront her harshly and his actions could cause her emotional or physical pain. But then, as the truth comes out, he has to deal with the guilt of what he's done.
One possible plotline could be that Alucard's actions towards Seras are a result of his complex nature and his struggle with his own vampiric instincts. Maybe he accidentally hurts her during a training session that gets out of hand.
One common way for Marinette to get revenge in fanfiction could be through her fashion skills. She could design something that makes Lila look foolish. Like creating a dress for an event that has a hidden message or design that mocks Lila's lies when she wears it. It's a more creative and less confrontational way of getting revenge, but still very effective in showing Lila that Marinette is not one to be trifled with.
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.
Maybe in some 'wanda hurts tony fanfiction', it's more of an emotional hurt. Wanda could accidentally reveal some of Tony's deepest secrets or traumas, causing him mental anguish. This could lead to a rift between them and the other Avengers having to deal with the fallout.
In Marinette x Lila fanfics, a frequent theme is the exploration of their complex relationship. Since they are often at odds in the original show, fanfics might focus on how they overcome their differences. There's also the theme of hidden feelings. Maybe Marinette has some unacknowledged feelings for Lila beneath her initial dislike, or vice versa. And sometimes, there's the theme of a shared adventure that brings them closer together, like facing a common enemy in the Miraculous Ladybug universe.