Perhaps there could be a crossover where an enemy from Naruto's world follows him to the Loud House world. This enemy wants to steal a special power that the Loud family unknowingly has. Naruto then has to team up with the Loud siblings to protect their family and the world from this new threat.
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 a crossover where the Loud family members gain ninja abilities. For example, Lincoln could be a skilled shadow clone user like Naruto. Another could be that the Naruto characters end up in the Loud House world and have to adapt to the strange family dynamics there. Maybe Naruto tries to teach the Loud siblings some of his ninja values like perseverance.
One idea could be a crossover where Naruto characters end up in the Loud House world. For example, Naruto and his friends could attend the Loud siblings' school and get involved in their daily shenanigans like dealing with bullies or school competitions. Another idea is a story where the Loud House kids discover ninja powers similar to those in Naruto. They could start training and use these powers to solve problems in their town.
One idea could be Naruto visiting Royal Woods. He could meet Lincoln and they could learn from each other. Naruto might teach Lincoln some ninja skills like tree climbing, while Lincoln could show Naruto how to deal with a large family. Another idea is that some of the Loud sisters get involved in a ninja - style tournament in the Naruto universe. They use their unique personalities and skills to compete.
One idea could be Naruto getting teleported into the Loud House world. He might be really confused at first by all the chaos and the large family. Then he could start to show off his ninja skills, like climbing the walls or doing some cool jutsu to impress the Loud kids.
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 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.
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.