Well, a great plot could involve the Loud family going on a Pokemon journey together. They could split up into teams and compete in a special Pokemon tournament held in their town. Or perhaps a mysterious Pokemon appears in their neighborhood and causes chaos, and the Louds have to use their Pokemon to calm it down. It would be interesting to see how they combine their different Pokemon skills to solve the problem.
Maybe there could be a story where the Loud house is transported into the Pokemon world. Lincoln could be the leader in trying to find a way back home. Along the way, they meet various Pokemon trainers and Gym Leaders. Each of the Loud siblings forms a unique bond with different Pokemon. For instance, Leni might bond with a Pikachu because of its friendly nature, and they all learn important lessons about friendship and teamwork from their Pokemon adventures.
One idea could be that Lincoln Loud discovers a rare and powerful Pokemon in Royal Woods. He then has to keep it a secret from his sisters while training it. Another could be the Loud sisters each getting a Pokemon that reflects their personalities. For example, Lola might get a Jigglypuff because it's cute and girly.
A cool plot for 'the loud house crossover fanfiction' might involve a crossover with 'My Little Pony'. The ponies could come to Royal Woods, and the Loud sisters could be fascinated by their magic and cuteness. Lincoln might have to figure out how to get the ponies back to Equestria while also dealing with his sisters' excitement. Or perhaps the Loud family travels to Equestria and has to adapt to a world ruled by ponies.
One idea could be that Naruto somehow ends up in the Loud House world. Maybe he's on a mission and a strange jutsu goes wrong, transporting him there. He could use his ninja skills to help the Loud siblings out with their daily problems, like getting rid of a bully at school using his shadow clone jutsu.
One idea could be that the Loud family members gain superpowers similar to the Avengers and have to team up to save Royal Woods from an alien invasion. For example, Lincoln could be like Captain America, leading the group with his strategic mind.
One idea could be a story where the Loud siblings discover a hidden attic in their house that leads to a magical world. Another could be a fanfiction focusing on Lincoln's adventures in a parallel universe where he has different superpowers. Maybe a story about the sisters teaming up to start their own band.
Another plot could involve a love triangle among the Loud siblings' friends. They all end up at the Loud House often, and the love triangle causes some tension. But through various events at the house, like parties or family outings, they start to understand each other better and resolve their differences in a really sweet way.
Perhaps there's a misdelivered message that causes chaos among the Loud siblings. For example, a love letter meant for someone else gets into the wrong hands, and they all start assuming different things about who likes who, leading to a series of comical misunderstandings.
Perhaps a plot where the Loud house gets transported to a different dimension. In this new dimension, all their normal rules and relationships are flipped, and they have to find a way to get back home while dealing with these changes. It could lead to some really funny and heart - warming moments as they adapt and learn about themselves in this new situation.
Perhaps Albert gets caught in a time - loop situation during the events of 'No Such Luck'. He has to relive the day over and over again, each time trying different things to break the loop and change the outcome for the better. He could interact with the Loud siblings in new and unexpected ways each time.
One idea could be that Spongebob and Patrick end up in the Loud House world. They could be really confused by all the human stuff and the big family. Maybe they try to make a Krabby Patty in the Loud House kitchen but use the wrong ingredients and chaos ensues.
One idea could be that the Loud family forms a rock band inspired by AC/DC's 'Back in Black'. They could have to overcome various challenges like finding a place to practice without disturbing the neighbors. Another could be that there's a mysterious black - themed event in Royal Woods that the Louds get involved in, and they use the energy of 'Back in Black' to deal with it.