Plagg, Chat Noir's kwami, would surely be important. He could offer advice to Chat Noir on how to deal with Gabriel. Maybe he has some knowledge about Gabriel that he hasn't shared before. Also, Adrien could be a significant character in the background. Since he is Gabriel's son, his presence or the threat to his well - being could influence the confrontation. And don't forget Nooroo, the kwami of the Butterfly Miraculous that Gabriel uses. He could be a wildcard in the confrontation, perhaps trying to break free from Gabriel's control.
In the 'Chat Noir Confronts Gabriel Agreste' fanfic, Chat Noir might finally expose Gabriel as Hawkmoth. He could use his cataclysm to threaten Gabriel into revealing his true identity and his motives for being Hawkmoth. This would be a huge turning point in the story as it would end the mystery that has been building up throughout the series.
One idea could be that his dad initially reacts with shock and disbelief. He might start to question how he didn't notice all the signs before. Then he could try to use Adrien's identity as Chat Noir to further his own business or social standing in some way, creating a lot of internal conflict for Adrien.
Well, in Adrien Agreste depressed fanfiction, it often delves deep into his complex character. His depression could be due to his strict family life, especially his over - controlling father. Fanfiction writers might explore how he copes with his dual identity as a model and a superhero. They may show his isolation and how he tries to hide his true feelings from his friends.
On the other hand, it could bring them closer. His dad might start to see Adrien in a new light, as a brave and capable hero. This newfound respect could lead to a more open and trusting relationship between them.
The theme of unrequited love can also be present. He might feel that Ladybug will never truly love him for who he is, especially when he is in a depressed state. This adds another layer of sadness to his character and the story.
In many fanfics, female Adrien is portrayed as having a strong sense of justice, just like the male version. However, she may show it in a more empathetic way. For instance, when dealing with akuma - victims, she might be more in tune with their emotions and try to help them on a deeper emotional level. Also, her relationships with other characters, especially with Chloe, can be more complex. Since they are both girls, there could be more of a cat - fight - like dynamic in some stories.
Marinette is often a popular character. Since she has a relationship with Adrien in the original series, in the fanfiction, she could interact with the sister in various ways. Maybe they become friends, or there could be some initial jealousy from Marinette if she thinks the sister is getting too much of Adrien's attention.
They could also start training together more often. Since Adrien is aware of Marinette's identity, they can practice their superhero skills without the worry of revealing themselves. This would make them a more formidable team. They could learn from each other's strengths and weaknesses, and Ladybug and Chat Noir would be able to defeat akumas more quickly and efficiently.
One interesting plot could be the sister helping Adrien deal with his double life as a model and a superhero. For example, she might accidentally discover his secret identity and then work behind the scenes to keep it safe from Hawk Moth.