A common theme is probably the power of positive thinking. Chat Noir's ability to see the good in everyone can inspire those around him to do the same. This could lead to a more harmonious and positive environment within the story. It might also result in the characters working together more effectively. Another theme could be the exploration of the 'good' in characters that are initially presented as complex or morally ambiguous. Chat Noir's perspective forces the reader (and other characters) to re - evaluate these individuals. And finally, a theme could be the contrast between Chat Noir's view and the more cynical views of other characters, creating interesting conflicts and discussions within the fanfic.
One common theme could be redemption. Since Chat Noir sees the good in everyone, characters who might be considered 'bad' in the original story could have a chance at redemption in the fanfic. For example, a minor villain might start to show signs of changing their ways because Chat Noir believes in them. Another theme could be friendship. His positive view of others might lead to the formation of unexpected friendships. He could befriend a loner or someone who is shunned by society, which would then be a central part of the story's development. Also, self - discovery for Chat Noir himself could be a theme. As he focuses on the good in others, he might also learn more about his own good qualities and how to better use them.
One plot idea could be that Chat Noir meets a new villain who seems extremely cruel at first. But because he likes to see the good in people, he tries to have conversations with the villain during their battles. Eventually, he discovers that the villain was once a victim of a greater evil and is only lashing out. So Chat Noir helps the villain turn over a new leaf.
One common theme is the idea of false accusations. In many of these fanfics, Chat Noir is wrongly accused of criminal acts, which leads to a lot of drama and his struggle to prove his innocence.
One common theme is the struggle between Chat Noir's normal self and the akumatized version. There's often a battle within him as he tries to fight the akuma's influence. Another theme is the reaction of Ladybug and other characters. They are usually shocked and have to figure out how to save their friend.
I'm not entirely sure as I haven't specifically studied 'chat noir sensitive fanfic', but it could potentially include themes like Chat Noir's internal struggles, his relationships with other characters in a more complex and emotional way, or perhaps how he copes with difficult situations in the Miraculous universe.
One common theme is heroism. Chat Noir and his patrol are usually depicted as heroes fighting against evil. Another theme is friendship, as they rely on each other in their missions.
Another theme might be rescue or recovery. The fic could focus on how Chat Noir's friends or Ladybug in particular try to help him when he's in this state. It could also touch on themes of sacrifice, as perhaps he got in this state because of protecting someone. For example, he might have taken a powerful hit from an akuma to save Ladybug, and now he's lying limp, and the story delves into how she deals with that and tries to revive or heal him.
Friendship is also a big theme. Through these fics, their friendship deepens as Chat Noir comforts Marinette. It shows how they can rely on each other even outside of their superhero and civilian identities.
One common theme could be courage. Chat Noir constantly shows courage in battles. Another could be friendship, as his relationship with Ladybug is a big part of his hero journey. And love, not just romantic love, but love for the city and its people.
One common theme is the struggle with identity. Chat Noir might be depressed because he feels torn between his superhero life and his normal life as Adrien. Another theme could be loneliness. Despite having friends like Ladybug, he may still feel alone in his battles and personal issues. And sometimes, it's about unrequited love. His feelings for Ladybug not being fully reciprocated can lead to a sense of depression.
Identity is a common theme. Chat Noir has to keep his identity a secret, and this can lead to a lot of deep thoughts about who he really is. He may question if he's more of his civilian self or his superhero self. Another theme is love, especially his love for Ladybug. It often consumes his thoughts and makes him wonder about the future of their relationship.