What could be an interesting plot for a Miraculous Ladybug and Dark Souls crossover fanfiction?

Ladybug would be very interesting. Her positive and creative approach in Miraculous Ladybug would contrast greatly with the dark and gloomy world of Dark Souls. She could bring a new perspective to the problems and challenges in the Dark Souls world. Her ability to think on her feet and come up with solutions using her Lucky Charm would be fascinating to explore in a world full of death and despair.

One possible plot could be that Ladybug and Chat Noir are transported to the world of Frozen. There, they meet Elsa and Anna. Maybe they team up to fight a new villain that is causing chaos in both the Miraculous and Frozen universes. For example, a villain might be using the power of the Miraculous to freeze parts of Paris and also trying to take over Arendelle.

A great plot could involve a portal opening between the two worlds. Harry, Hermione, and Ron accidentally stumble through it. In the Dark Souls world, they find that their magic works differently. They meet characters from Dark Souls who are initially hostile but then realize they have a common enemy in the form of Voldemort's forces that are starting to corrupt the Dark Souls world as well. Harry has to learn the ways of the Dark Souls combat and use his wits and magic to form an alliance. They then return to Hogwarts with new powers and knowledge to face Voldemort in a final battle that combines the magic of Harry Potter and the dark and gritty elements of Dark Souls.

In a Miraculous Ladybug wedding fanfiction, it could start with Ladybug having a dream about marrying Chat Noir. She wakes up flustered but realizes she has some real feelings for him. Chat Noir, on the other hand, has been secretly planning a big proposal. When he finally does it, Ladybug says yes. For the wedding, they decide to have it in a secret garden that only they know about. Marinette's family and Adrien's father (who has had a change of heart) come together to help with the arrangements. The wedding ceremony is filled with magic, as their kwamis play little tricks to make the day even more special. And at the end of the day, they transform into Ladybug and Chat Noir and have a private dance on the rooftops of Paris.

Another plot could involve Anna getting a Miraculous. She could be a new hero in Paris, teaming up with Ladybug and Chat Noir. They might face a villain who has the ability to create eternal winter like in Frozen, and Anna's experience with dealing with Elsa's winter could come in handy. Also, the cultural differences between Arendelle and Paris could add some interesting twists to the story.

One idea could be that the Dark Owl discovers a new power within his Miraculous that he has to learn to control. Maybe it makes him see things from the past related to the Miraculous that could change the way he fights villains.

A possible plot could involve the Dragon Kwami falling ill. In the Miraculous world, this is a big problem as the Kwamis are essential. Ladybug and Chat Noir team up with other Miraculous holders. They have to search for a special cure that exists in an ancient, hidden place. Along the way, they face many challenges and learn more about the Dragon Kwami's origin.

Perhaps on Heroes Day, Hawk Moth decides to use the positive energy of the day against Ladybug and Chat Noir. He creates an akuma that can absorb the love and admiration that the people have for the heroes. As the akuma grows stronger, Ladybug and Chat Noir find it difficult to fight. They have to find a way to turn the people's love back into a strength rather than a weakness for the akuma. Meanwhile, they also learn more about their own powers and how they can be enhanced during this special day. They start to involve the citizens more in their fight, making Heroes Day truly a day of heroes working together to defeat evil.

Maybe there could be a special gym competition between different classes. Marinette's class has to work together to win. But there's a problem - Marinette and Adrien keep getting distracted by each other. Marinette wants to impress Adrien, and Adrien is always trying to be near Marinette. Meanwhile, Hawkmoth senses the strong emotions in the gym and sends an akuma to target one of the students who is feeling left out because they're not as athletic as the others. The class then has to deal with the akuma while also trying to win the competition.

A possible plot could be that Nino discovers a hidden underground society in Paris that has a connection to the Miraculous. He gets involved in their affairs and realizes that they have been secretly protecting the city from threats that even Ladybug and Chat Noir don't know about. He has to decide whether to share this information with his superhero friends or keep it to himself to protect the underground society.