Alya could be a great caretaker in the fanfic. She's smart and resourceful. If she discovered Chat Noir needed help, she would jump at the chance to take care of him and might even try to get an exclusive interview for her Ladyblog in the process. Also, Tikki could be a caretaker. As a kwami, she has magical powers and knowledge. She could use her powers to heal Chat Noir if he was hurt or guide him if he was lost or confused.
Ladybug would be an obvious choice. Since they are partners, she has a vested interest in his well - being. She's also strong and capable, so she could easily take care of Chat Noir if he was injured or in trouble. Another option could be Marinette's parents. They are kind - hearted people. If Chat Noir somehow ended up at their bakery, they would surely take care of him, not knowing his true identity but seeing a young person in need.
Perhaps Chat Noir is trapped in a different dimension where he can't use his powers easily. A kind-hearted character from that dimension decides to take care of him. This character could teach Chat Noir about their world while also trying to find a way to send him back home. Along the way, Chat Noir could learn some valuable lessons and grow as a character, all while being under the care of this new acquaintance.
One possibility is that his father could be an older, more experienced superhero. Maybe he was a hero in the past and has been in hiding or something, and now he comes back to reunite with Chat Noir.
Another possibility is that an old enemy of Chat Noir, perhaps someone he defeated in the past but who has now come back with a vengeance and a new power. This enemy could be using a form of dark magic to try and control Chat Noir, making him do things against his will. Chat Noir would then have to fight not only the physical attacks of this enemy but also the mental control they are trying to exert.
It could be a new villain who has the power to manipulate time. This villain would be constantly changing the past and future to create chaos in Paris. Chat Noir would have to figure out how to stop this power. Maybe the villain is doing it to find a powerful artifact from the past that was hidden to prevent it from being misused.
Another possibility is that Ladybug could become the main antagonist in a sense. If Chat Noir turns dark and Ladybug tries to stop him, from Chat Noir's new perspective, Ladybug could be seen as the one standing in his way. Their relationship would be completely flipped, and Ladybug would have to find a way to bring Chat Noir back to the light while also dealing with his attacks.
Chat Noir is often extremely helpful in fanfics. He uses his superpowers like cataclysm to protect the city and the people he cares about. For example, in many fanfics, he might save a civilian from a falling building by using his agility and acrobatic skills. His helpful nature also extends to his relationships, as he is always there to support Ladybug, whether it's in battles or in dealing with personal issues.
In a fanfic about Chat Noir fighting for control, it could be about his struggle with his own emotions. He might be falling in love with Ladybug too deeply and it starts to cloud his judgment during battles. So he has to fight to regain control over his feelings and focus on their mission to protect Paris. This internal fight could lead to some interesting character development, like him becoming more mature and better at handling complex emotions.
Well, perhaps Chat Noir got seriously injured during a fight with a powerful akumatized villain. His partner Ladybug might be worried sick as she rushes him to the hospital. Maybe his identity is at risk of being revealed there too.
One plotline could be that Ladybug has disappeared for some reason, leaving Chat Noir alone to protect Paris. He might struggle with the increased pressure and loneliness, doubting his abilities without his partner.
A Chat Noir 'Meaning of a Hero' fanfic could be about exploring the deeper significance of Chat Noir being a hero. It might delve into his self - sacrifice, his loyalty to Ladybug and Paris. For example, it could show how he overcomes his personal fears to protect the city, like when facing akumatized villains who are much stronger than him.