One interesting plot point could be Luka's internal struggle. Even as an akumatized villain, his good nature might be trying to break through. For instance, he might hesitate to cause real harm to Ladybug or Chat Noir. Another point could be the way his friends try to reach out to him. Juleka might be especially desperate to bring her brother back, and this could lead to some really heart - wrenching scenes. Also, his akuma form's powers evolving as his emotions intensify during the fight would be an exciting plot element.
In a fanfiction where Luka is akumatized, the plot could involve his akuma form having a connection to his family. Since his mother is Anarka, there could be some backstory related to her that is brought into play. Maybe the akuma enhances his protective instincts towards his family in a wrong way, and he starts seeing Ladybug and Chat Noir as threats to them. This would create a complex situation where Ladybug and Chat Noir not only have to deal with his powers but also try to make him see that they are not enemies of his family.
A great plot point would be how Hawk Moth convinces Luka to accept the akuma in the first place. Maybe Hawk Moth preys on Luka's love for Marinette and his confusion about her relationship with Adrien. Then, as Luka is akumatized, his powers could start to affect the city in strange ways. The city's music scene could be completely disrupted, with all music turning into a weapon for him. And Ladybug and Chat Noir would have to figure out how to use their own powers in a musical - themed battle to defeat him.
Well, a fanfiction about Luka getting akumatized might start with a misunderstanding. Maybe he sees Marinette and Adrien together and misinterprets their relationship. As an akumatized character, he could have a really cool and menacing design. His akuma form might be named something like 'Melodic Mayhem' and his powers could involve disrupting the harmony around him, not just in a musical sense but also in people's relationships. This would force Ladybug and Chat Noir to think differently when fighting him.
In an akumatized Ladybug fanfiction, the akuma might enhance her powers in unexpected ways. For example, her Lucky Charm could become a more powerful and unpredictable object. Her akumatized form might also have a darker and more menacing look, perhaps with a more aggressive fighting style. Writers could explore how the heroes and villains interact with this changed Ladybug.
In a fanfiction of this kind, the akumatized reader could be a huge fan of Ladybug, but after being rejected one too many times when trying to offer help or get an autograph, they get akumatized. Their akumatized form might have powers related to disappointment, like creating illusions of the worst - case scenarios for Ladybug and Chat Noir, making their battles more difficult. To defeat this akumatized reader, Ladybug and Chat Noir would need to show the reader that they do value their support.
The plot could involve Adrien being akumatized after a big fight with his father. He might feel extremely alone and angry. His akumatized form could have the ability to freeze time in certain areas. Ladybug would struggle to figure out how to defeat him without hurting him too much. She might have to team up with some of the other Miraculous holders like Rena Rouge and Carapace to come up with a plan.
Another plot could involve Chat Noir being akumatized by an akuma that was specifically designed to target him. Hawkmoth could have studied Chat Noir's behavior and weaknesses. Once akumatized, Chat Noir could start to turn Paris against Ladybug. He could spread false rumors or use his charm in a negative way. Ladybug would then need to prove her innocence and save Chat Noir from the akuma's control. This would require her to dig deep into their relationship and find a way to reach the real Chat Noir.
A possible plot idea is that Marinette is akumatized after being wrongly accused of something at school. Her akumatized form could have the power to manipulate people's memories, making them believe false things about their friends. This would cause a lot of chaos and mistrust in Paris. Chat Noir would have to find a way to reach the real Marinette inside the akumatized shell and convince her to break free. It would be a story full of drama and action.
The plot could involve Luka's snake powers being stolen. He then has to team up with Ladybug and Chat Noir to get them back. Along the way, they discover that the thief has a connection to an ancient Miraculous holder. Luka has to rely on his wits and his natural snake - like instincts to track down the thief.
One possible story could be that Adrien gets akumatized because he feels constantly overshadowed by Ladybug. In this fanfiction, Hawkmoth might prey on his insecurities. As an akumatized form, Adrien could have enhanced physical abilities like super strength and speed. His akumatized look might be a dark version of his Chat Noir costume, with a more menacing appearance.
One common plotline is about Luka helping Marinette deal with her feelings for Adrien. He becomes her confidant and through that process, they start to develop deeper feelings for each other.
A popular theme is Luka's role as a support figure. Fanfictions often show him being there for Marinette when she's down or in trouble. Also, the theme of Luka's discovery of his own identity within the Miraculous universe is quite common. He might find out he has a hidden power or a special connection that he wasn't aware of before.