In some 'Adrien gets akumatized fanfiction', his akumatization could be caused by a misunderstanding with his father. This could lead to his akumatized form having powers related to control or isolation, like being able to trap people in a sort of prison made of his negative emotions. The story could then focus on how Marinette, as Ladybug, tries to reach out to the real Adrien inside the akumatized form. She might have to dig deep into their relationship and use memories they've shared to break through to him.
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.
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.
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.
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.
One possible plot could be Marinette getting akumatized because she feels constantly overshadowed by Ladybug's responsibilities. She might turn into an akuma with powers that are a twisted version of her creativity, like creating chaotic and unmanageable 'designs' that cause havoc in Paris.
One possible plot could be that Ladybug is betrayed by someone she deeply trusts, like Chat Noir accidentally revealing her identity to Hawkmoth. This shatters her world and makes her vulnerable to Hawkmoth's akuma. As Ladybug gets akumatized, Paris is in chaos as she starts using her powers in a negative way. The other heroes, like Rena Rouge and Carapace, try to find a way to save her and break the akuma's hold.
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.
In certain fanfictions, Dumbledore could get caught in a lie. Maybe he told the students one thing about a particular magical artifact, but then was caught when it was revealed he knew more than he let on. This would create a lot of drama as the students and other faculty members might lose trust in him for a while.
In some 'Nightwing gets captured' fanfictions, he might be captured by a powerful villain like Deathstroke. This could lead to intense fight scenes when his friends come to rescue him. For example, Batman and Robin might team up, using their detective skills to find Nightwing's location.
One plot development could be that Hiccup discovers an ancient technique for building stronger dragon saddles. This new saddle design not only gives him better control over Toothless but also allows him to perform more advanced maneuvers. As a result, he becomes a more formidable rider and his reputation as a dragon trainer grows.