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.
One idea could be that the Loud family somehow gets transported to Gotham City. Lincoln could befriend Robin and they team up to solve a mystery that involves both Gotham and Royal Woods' villains. Maybe the Joker has a plan that involves stealing a special item from Royal Woods, and the Louds have to work with Batman to stop him.
One way it could work is by having Spiderman visit Royal Woods for some reason. Maybe he's chasing a villain who has some connection to the town. Once there, he meets the Loud family and gets involved in their wacky antics.
One example could be a crossover where the characters from 'The Loud House' meet the characters from 'IT' in a strange town. Maybe the Loud siblings end up in Derry and have to face Pennywise together with the Losers Club. It could be interesting to see how the different personalities from 'The Loud House' react to the terrifying situations in 'IT'.
In such a fanfiction, the characters from 'The Loud House' could find themselves in Spyro's world. Maybe Lincoln Loud might team up with Spyro to fight some common enemies. For example, they could face a villain who is causing chaos in both their worlds. The Loud siblings' unique personalities could add a new dynamic to Spyro's adventures.
One possible plot could be that Casper, the friendly ghost, gets lost in Royal Woods where The Loud House is located. The Loud kids discover him and at first are scared, but then they realize he's friendly. Together, they help Casper find his way back to the Ghost World while having all sorts of wacky adventures in Royal Woods, like trying to hide Casper from their parents and getting into spooky yet funny situations at school.
The plot could involve the Hulk being shrunk down to the size of the Loud House family. He would then have to live with them and adapt to their chaotic household. The Loud kids would be fascinated by his strength and the Hulk would learn about family values from the Louds. There could be comical scenes where the Hulk tries to fit in, like sitting on the tiny furniture or trying to eat normal - sized food.
A cool plot could be that Mr. Krabs discovers a new market in Royal Woods. So he sends Spongebob and Squidward there to set up a Krusty Krab branch. The Loud kids are excited about the new restaurant, but Squidward is miserable as always. Lincoln and Spongebob team up to make the new Krusty Krab a success, facing challenges like dealing with local competition and getting used to the different customers in Royal Woods.
Well, maybe there's a portal that opens up between Royal Woods and Bikini Bottom. Spongebob and Patrick come through to the Loud House world. Patrick could be really confused by all the human stuff and keep getting into funny situations like trying to eat the furniture thinking it's food. Meanwhile, Spongebob and Lincoln team up to solve a mystery that involves a missing item from both their worlds. It could be something like a special kind of jellyfish that has magical powers and it has ended up in Royal Woods.
If you're doing a crossover with 'Scooby - Doo', Scooby and Shaggy are must - includes. They could bond with the Loud family over food and then get caught up in a mystery in Royal Woods. Velma could use her smarts to solve the mystery, and Fred could lead the way with his trap - making skills. Daphne could also befriend the Loud sisters and add some charm to the story.