In a Harry Potter and The Loud House crossover fanfiction, it would be cool if the Weasley twins visited the Loud House. They could introduce their magical pranks to the Loud siblings, and together they create the most amazing and chaotic pranks ever. Also, Lily Loud might have a special connection to the magical creatures in the Harry Potter universe, like she can communicate with them, which leads to an adventure to save a rare magical creature.
Well, perhaps Voldemort's soul fragments somehow end up in Royal Woods. The Loud family then has to team up with Harry Potter and his friends to stop the dark magic from spreading. Or, Luna Loud could be a natural at potions and gets an invitation to study at Hogwarts for a semester. She brings along her unique family dynamic and causes quite a stir among the Hogwarts students.
One idea could be that the Loud siblings discover they have magical abilities and are sent to Hogwarts. Lincoln could be sorted into Gryffindor for his courage in dealing with his large family. Another could be that a wizard from the Harry Potter world visits Royal Woods and gets involved in the chaos of the Loud family. Maybe they help the family solve a mystery using magic.
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 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 misfortunes from 'No Such Luck' somehow cross over into an alternate universe in the crossover. For example, Lincoln's bad luck could start affecting the other characters from the crossover world in strange ways, like causing their gadgets to malfunction.
One idea could be a crossover with another popular animated show. For example, the characters from 'Loud House' could end up in a different universe where they have to use their unique skills from 'No Such Luck' to survive. Maybe they meet characters who have similar family dynamics but different challenges.
Maybe the Loud siblings could be transported to the TMNT universe. The boys would be fascinated by the Turtles' ninja skills and gadgets, and the sisters could use their own unique skills to help the Turtles in their fight against the Foot Clan. For example, Lola could use her pageant charm to distract the bad guys, while Lincoln could bond with the Turtles over being part of a big group.
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.
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 exploring a different timeline where the Loud siblings have different careers from a young age. For example, Lincoln could be a successful young artist. Another idea is to focus on a mystery within the Loud house, like a hidden room with a family secret. Or you could do a fanfiction where the family goes on an adventure to a magical world that only they can access.
In this crossover fanfiction, the Hulk's strength could be used to help the Loud family in a big way. For example, there could be a natural disaster about to hit Royal Woods, like a huge flood or an earthquake. The Hulk, with his superhuman strength, could hold back the floodwaters or stop the shaking ground. Meanwhile, the Loud kids could be helping the townspeople evacuate. It would be a story of how two different universes come together to save a town.