Fatigue could be a reason. All those battles and saving the day can be physically and mentally exhausting. He might reach a point where he just can't take it anymore. For instance, if he has to fight back - to - back villains without much rest in between.
One possible reason for Adrien to quit being a hero in fanfiction could be the toll it takes on his personal life. Constantly having to balance his superhero duties with his normal life, like school and relationships, might become overwhelming. For example, he might miss out on important events with his friends or family due to his hero responsibilities. Another reason could be a moral conflict. Maybe he discovers some dark secrets within the hero community that make him question whether he wants to be part of it anymore. Also, he could be forced to quit if his identity is exposed and it puts his loved ones in danger, so he decides to step away to protect them.
One reason could be that he gets tired of the constant danger and the toll it takes on his personal life. He might have lost too many loved ones due to his superhero identity, and he just can't bear the pain anymore.
Yes, it likely will. Quitting as the hero can lead to major plot changes and character developments.
The 'quitting time fanfiction' might be centered around the emotions and experiences associated with quitting time. It could explore the relief, excitement, or sometimes the dread that characters feel as they reach the end of their work or task time. In a business - themed fanfiction, it could show office politics that come to a head during quitting time, or relationships between colleagues that change as they leave work. It might also be a creative exploration of how different fictional characters deal with the transition from work/activity time to personal time.
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.
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.
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.
A great element in such a fanfiction could be the family aspect. Maybe they start thinking about having children. How would they raise their kids? Would their children inherit their superhero powers? And how would they protect their family from the villains in their world? Their friends like Alya and Nino could also play important roles in their married life, perhaps as godparents or just as good friends who are always there to offer advice and support.
You can find 'Adrien and Nathaniel Fanfiction' on websites like Archive of Our Own (AO3). It has a large collection of fan - created stories. Just search for their names in the search bar and you'll get a list of relevant fanfics.