There was an interesting 'lego ninjago crossover fanfiction' that involved a crossover with 'Avatar: The Last Airbender'. The way the Ninjago characters interacted with the benders was fascinating. For example, the ninja's elemental powers were compared and contrasted with the bending abilities in Avatar. It was a really unique take on a crossover.
I liked the one where Lego Ninjago crossed over with 'Ben 10'. In this fanfiction, the ninjas had to work with Ben to stop an alien invasion that was also affecting Ninjago. The author did a great job of mixing the two universes' lore and making it seem like a natural combination. Ben's ability to transform into different aliens added a lot of variety to the story.
One great 'lego ninjago cole x reader fanfiction' is 'Cole's New Beginning'. It has a really engaging plot where the reader character gets to train with Cole and they develop a deep friendship that could turn into something more. Another one is 'Cole and the Mysterious Reader' which is full of mystery and adventure as the reader character has a special power that Cole discovers.
One great 'kenpachi crossover fanfiction' I read was a crossover with Naruto. It was really interesting to see Kenpachi in the world of ninjas. His brute strength and unique fighting style added a whole new dynamic to the Naruto universe. He interacted with characters like Naruto and Sasuke in a really cool way, getting into some epic battles and also some humorous exchanges.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. They have a wide range of Lego Ninjago Harumi fanfictions. Just use the search bar and type in 'Lego Ninjago Harumi' and you'll get numerous results.
One great Yugioh crossover fanfiction I've read is the one that crosses over with 'Pokemon'. It was really interesting to see the characters from Yugioh interact with Pokemon trainers. The battles were unique as they combined the rules of both universes in a creative way.
One great 'hero academia crossover fanfiction' I read was a crossover with 'Avatar: The Last Airbender'. It was really interesting to see how the characters from Hero Academia would interact with the bending powers and different cultures in the Avatar world. For example, Bakugo trying to learn firebending and getting frustrated with the spiritual aspects.
Perhaps a fanfiction where the female Kai gets transported to an alternate dimension. In this dimension, she meets different versions of the ninjago characters. She has to find a way to get back home while also learning valuable lessons about herself and her powers. This could involve her facing challenges that the male Kai may not have faced in the original story.
There are many hidden stories that can be told in Jay and Nya fanfiction. A simple idea could be a story where they get lost in a mysterious part of Ninjago. This would test their skills and their relationship. They might have to rely on each other more than ever.
Begin by choosing a crossover that interests you. If you pick something like a crossover with 'Dragon Ball Z', think about how the power levels in both universes compare. Then, create a scenario where the Ninjago characters are introduced to the Dragon Ball Z world. Maybe they're brought there by a magic spell or a malfunctioning portal. Outline the story, develop the relationships between the characters from different worlds, and don't be afraid to be creative with the plot.
I liked the 'Games of Thrones' and 'Harry Potter' crossover fanfiction. In this, they brought the magic of Hogwarts into the world of Westeros. The wizards had to deal with the political intrigue and the harsh reality of the Seven Kingdoms. It was cool to see spells being used in battles against knights and the like. And the way the houses in 'Game of Thrones' reacted to this new form of power was really engaging to read about.
The plot is key. It could be a story that takes place during an alternate timeline in the Ninjago universe. Maybe Harumi has a change of heart earlier and teams up with the Ninja against a greater threat. The plot should be engaging and keep the reader interested from start to finish. It should also be consistent with the overall Lego Ninjago lore, while adding something new and exciting.