For Lincoln in this crossover, you can focus on his resilience from 'No Such Luck'. Despite all the bad luck he had, he still tried to keep a positive attitude. In the crossover, put him in difficult situations where he has to use that same tenacity. For example, if they cross into a dangerous new world, he could be the one motivating the others.
Luna could use her musical talent in a unique way. Maybe in the crossover world, music has a different power. She could be the one to discover this and use it to help the family. Her carefree and creative personality would shine as she experiments with this new form of music. It would show how her character from 'Loud House' adapts to the crossover scenario.
How about a character from a classic fairy tale? For instance, Cinderella could be accidentally brought into the 'The Loud House' world during the crossover. Her presence could contrast with the chaos of Lincoln's bad luck. She might try to use her positive attitude and her experience with hardships to help Lincoln deal with his situation.
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.
Another plot might involve a character from the 'bad luck' side of the crossover coming to the Loud House world and bringing their bad luck with them. This could disrupt the normal family dynamics. The Loud siblings would then have to figure out how to get rid of the bad luck and restore order. They might try all sorts of wacky plans, like using their own unique skills and talents in a new way to combat the bad luck.
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.
First, focus on the characters' personalities. For example, make use of the Loud siblings' diverse traits. Then, blend the horror elements of 'IT' with the family - centric theme of 'The Loud House'. Maybe have the kids from 'The Loud House' use their family bonds to overcome Pennywise's fear - inducing tactics.
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.
Link is often a silent and determined hero. In a crossover, his quiet determination can contrast well with the more outspoken characters in RWBY. For example, Ruby's bubbly and enthusiastic personality could be a foil to Link's stoicism. Weiss' haughty nature might initially clash with Link, but over time, she could come to respect his skills. Blake's more reserved and mysterious side might find common ground with Link's own quiet demeanor. Yang's bold and brash personality could be a source of both conflict and growth for Link as he learns to be more expressive.
For the Rangers, their interactions with new characters can show different sides of them. If they cross over with a more light - hearted group, like the Smurfs, the Rangers might show a more patient and protective side. They'd have to keep the Smurfs safe while also dealing with the main threat.
For the main Jessies, the Jessie from 'Toy Story' is brave and loyal. The 'Jessie' show's Jessie is resourceful and kind - hearted. In a crossover, they could combine these traits. When facing a challenge like a bully in the penthouse or a mean toy in the Toy Story world, they'd be both brave in standing up to it and resourceful in finding solutions. Their kindness would also help them make friends with the characters from the other universe quickly.