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.
Another thing that could occur is that their relationship dynamic would completely change. Instead of the usual cat - and - mouse game between Adrien and Marinette (where Marinette is shy around Adrien), Adrien could be more open and direct with her. Since he knows her big secret, he might feel a stronger connection to her and try to get closer in a different way than before.
She would also be very determined to bring him back to the good side. Ladybug might search for a way to break whatever spell or influence has made Chat Noir evil. She could look for a special power - perhaps from another Miraculous or a magical item - that can reverse the change. And in the meantime, she has to be careful not to get hurt by Chat Noir while still trying to protect Paris.
Their relationship would probably become more complex. Adrien might feel a new sense of closeness to Marinette.
A must - read Chat Noir and Ladybug fanfiction is 'Love in the Shadows'. It has a really interesting plot where their love is tested in unexpected ways. 'The Parisian Miracles' is also great as it has a lot of action and at the same time explores the relationship between the two heroes. And 'The Secret of the Miraculous' is a fanfiction that keeps you on the edge of your seat as it reveals some secrets about their powers and how it affects their relationship.
Luka, who has feelings for Marinette (Ladybug), might be heartbroken at first. But he's a kind person, so he might also be a bit relieved in a way, knowing that Marinette has found someone she truly loves. The other kwamis might be all excited, chattering among themselves. Tikki might be a bit worried at first, thinking about how this relationship could change things for Ladybug, but then also be happy for her as she sees how much Ladybug cares for Chat Noir. Plagg, of course, would be making jokes and teasing Chat Noir about it non - stop.
There's also 'Marinette's Hidden Talents'. In this fanfic, Adrien discovers some unique skills that Marinette has been hiding. It's a really interesting take as it builds on their characters and the bond between them. It has a lot of cute moments and a bit of mystery too.
Another amazing one is 'A Different Perspective'. This fanfiction shows the story from Adrien's point of view. It gives new insights into how he sees Marinette and how his feelings for her start to change from just friendship to something deeper.
One idea could be that Adrien initially feels shocked but also a sense of relief. He might have always had a feeling that Marinette was special, and now it all makes sense. So he starts to view her in a whole new light, with more respect and admiration for her dual identity.
Some excellent ladybug and chat noir fanfiction include 'Ladybug's Training Days'. It delves into how Ladybug hones her skills and overcomes challenges during her training. 'Chat Noir's Redemption' is a thought - provoking piece where Chat Noir has to make amends for a big mistake. There's also 'The Team - Up of Ladybug and Chat Noir Against [Villain]', which showcases their great teamwork in a new and exciting way. The world of fanfiction for Ladybug and Chat Noir is vast, and these are just a few gems to start with.
A good fanfiction in this regard should first have a believable character development. For example, showing how Marinette overcomes her shyness around Adrien gradually. Second, it should have interesting plot twists. Maybe something that makes their relationship take an unexpected turn. For instance, a new power or a new character that affects their dynamic.