A cool vikings crossover fanfiction idea is to cross it with 'The Witcher'. Vikings could meet Geralt and get involved in his monster - hunting quests. They might see the magic and creatures in the Witcher world as either a threat or an opportunity. Also, a crossover with 'Assassin's Creed' could be interesting. Vikings could encounter the Assassins and Templars, and their own beliefs and values could clash or align with these secret organizations.
One plot idea could be Thor landing in the Viking era and being mistaken for a god. The Vikings might try to either worship or challenge him. Another could be a Viking warrior being chosen by Thor to help him on a quest in Asgard. Or perhaps Thor has to team up with a group of Vikings to fight a common enemy like a giant frost monster.
One idea could be a scenario where the Vikings' raiding parties encounter the Night's Watch from Game of Thrones. Maybe they initially see each other as threats, but then realize they could be useful allies against the White Walkers. Another could be a story about a character from Vikings, like Ragnar Lothbrok, being magically transported to Westeros and having to navigate the complex politics there, similar to how he did in his own land.
There's also 'A Meeting of Two Worlds' which is a well - written fanfic. It delves into how the cultures from both shows would interact. The author does a great job of keeping the characters in - character and creating a believable story where the two universes collide. It has some exciting battle scenes and political intrigue that fans of both shows would enjoy.
One potential pairing could be Naruto and Ragnar Lothbrok. Naruto's optimistic and determined nature could contrast well with Ragnar's more calculating and ambitious side. They could learn from each other's leadership styles. Naruto could show Ragnar the importance of believing in oneself and others without always being so focused on power, while Ragnar could teach Naruto some strategic thinking when it comes to large - scale battles.
One idea could be a crossover where a Viking warrior somehow ends up in Westeros. Maybe he gets shipwrecked on the shores near King's Landing and has to navigate the complex politics there, using his Viking fighting skills to his advantage. Another could be a story where a character from 'Game of Thrones' travels to the Viking lands and has to adapt to their way of life, facing challenges like raiding and their different religious beliefs.
One idea could be an OC who is a healer from a far - off land and gets caught up in the Viking raids. She uses her unique healing skills to save an important Viking warrior, like Alfred's ally. This creates a bond between the two groups and she has to navigate the cultural differences.
One idea could be a Jessie crossover with a superhero universe. Jessie could use her skills and charm to team up with superheroes, perhaps helping them understand the value of friendship like she does with her friends in her own show. Another could be a crossover with a fairy - tale world where she brings her modern - day smarts to solve problems in a magical realm.
One idea could be a crossover between Usopp and the world of Harry Potter. Usopp could be a wizard who uses his creativity and skills to create unique magical items and tricks, much like his inventions in his own world. Another could be a crossover with the DC universe, where Usopp teams up with the Green Arrow. They both have skills with ranged weapons and could learn from each other. A third idea is a crossover with the Final Fantasy series. Usopp could find himself in a world full of magic and strange creatures, using his wits to survive and help the characters there.
For a Matilda crossover fanfiction, consider a crossover with The Secret Garden. Matilda could help bring the garden back to life with her unique abilities. Or, a crossover with Charlie and the Chocolate Factory. She could use her smarts to solve some of the strange mysteries in Willy Wonka's factory. Also, a crossover with Peter Pan would be interesting. Matilda could befriend Peter and the Lost Boys and use her powers to fight Captain Hook.
One idea could be an Ansem crossover with a popular fairy - tale world. For example, crossing Ansem with the world of Alice in Wonderland. Ansem's dark and mysterious nature could contrast well with the whimsical and often illogical world of Wonderland. He could be on a quest for some dark power hidden within the Wonderland, interacting with characters like the Cheshire Cat or the Queen of Hearts in his own devious way.