A cool concept for a Miraculous Team fanfic could be a crossover with another popular superhero or magical world. Imagine the Miraculous Team meeting the Avengers or characters from the Harry Potter universe. This would bring new dynamics and interactions. Also, a fanfic could focus on the relationships between the team members outside of their superhero duties. Like how they support each other during normal school days or family issues.
One idea could be exploring the backstories of the Miraculous Team members in more depth. For example, how did they first discover their Miraculouses? Another idea is to create a new villain that challenges the team in a completely different way than before. Maybe a villain who can manipulate time, forcing the team to think and act quickly in a very disrupted timeline.
One idea could be a story where the Miraculous powers are combined with Pokemon abilities. For example, a character with the Ladybug Miraculous can use it to enhance the powers of their fire - type Pokemon, making its flames more powerful and able to withstand water - type attacks better. Another idea is to have the Pokemon world in chaos due to an evil force, and the Miraculous holders have to team up with powerful Pokemon trainers to save it. They could travel across different regions, facing challenges and discovering new Pokemon along the way.
One idea could be a fanfic where Team Naruto goes on a mission to a hidden, magical forest that has the power to bring out their deepest fears and they have to overcome them to complete the mission. Another could be a story where they time - travel back to the days of the First Hokage and get involved in the early battles and politics of Konoha. Maybe a fanfic where they have to team up with their enemies from past missions to fight a common, greater evil that threatens the entire ninja world.
One idea could be an OC who has a unique Miraculous that is related to a different aspect of nature, like a firefly Miraculous. The OC could struggle with controlling its powers at first. Another idea is an OC who is from a different country and brings in new cultural elements to the Miraculous world. For example, they might have a special fighting style based on their native martial arts.
One idea could be a crossover with the DC universe. Ladybug and Cat Noir could team up with Superman to stop an akumatized Lex Luthor who has somehow gotten his hands on a Miraculous. Another plot could involve a crossover with the Harry Potter world. Maybe Hawk Moth tries to steal magic from Hogwarts, and Ladybug and Cat Noir have to work with Harry and his friends to stop him.
In a 'naruto solo team fanfic', Naruto could be sent on a diplomatic mission alone. Since he's known for his ability to make friends, the village elders think he can handle it. He meets different ninja clans and has to convince them to form an alliance with Konoha. Without his team, he has to rely on his own charm and wits. He tells them stories of his past battles and how Konoha has always been about peace and unity. Along the way, he also discovers some secrets about the clans that could be beneficial for Konoha in the future.
Well, you could write a fanfic about the Cuddle Team Leader having a day off. She goes to a normal town and tries to blend in, but her cuddly nature keeps causing funny situations. For example, she might accidentally make everyone in a coffee shop start hugging each other because of her positive energy. Or a story where she has to train a new recruit to be part of the Cuddle Team, teaching them the importance of hugs and kindness.
One idea could be exploring the backstories of the Miraculous holders in more depth. For example, how did Marinette first discover her powers and what was her initial reaction? Another idea is to create an alternate universe where the roles of the heroes and villains are reversed. This would bring a whole new dynamic to the story. Also, a fanfiction could focus on the relationship between the kwamis and their holders, like how they communicate and influence each other's decisions.
One idea could be that the cats in the Miraculous Ladybug world are somehow affected by a new curse that makes them lose their agility. This would cause problems for Cat Noir as he tries to fight villains. Another could be a curse that makes all the cat - related items in Paris turn into something else, like the catacombs becoming a maze of thorns, and Ladybug and Cat Noir have to find a way to reverse it.
One plot idea could be that Ladybug and Chat Noir have a huge fight due to a misunderstanding, which leads to a 'hate' phase. But as they face a powerful villain alone, they realize they need each other and slowly start to rekindle their friendship and the underlying love. For example, Chat Noir could be wrongly accused by Ladybug of working with a new villain. As they work separately to defeat the villain, they see the struggles each other faces and remember why they were partners in the first place.
One idea could be a fanfic where Ladybug and Cat Noir get trapped in an alternate dimension. They have to work together in new and strange ways to find a way back home. Another could be a story where their identities are revealed to each other accidentally, and they have to deal with the new dynamic between them. Maybe a fanfic where they have to team up with some of the akumatized villains to fight a greater threat.