Maybe a group of Vikings from For Honor could team up with characters from another game or movie universe that also has a strong warrior - based culture. For example, they could join forces with the Spartans from 300. They would have to learn to work together, despite their differences in fighting styles and beliefs. This could lead to some epic battle scenes and character development as they learn from each other.
One idea could be a story about a young knight from one of the factions who gets separated from his comrades during a battle. He then has to survive in enemy territory and in the process, he discovers a hidden conspiracy within the enemy's ranks. He must then decide whether to use this knowledge to his advantage in the ongoing war or to try and expose it to bring about peace.
One idea could be a crossover with another military - themed game like Call of Duty. You could have characters from both universes team up on a special mission. Maybe a group of Medal of Honor soldiers join forces with Call of Duty's Task Force 141. They could face a common enemy that is threatening global security. This would bring together different playstyles and weaponry from both games.
A possible plot for 'rwby for honor fanfiction' could be centered around a tournament. Characters from both RWBY and For Honor participate in a grand tournament. The tournament has unique rules that combine elements of both worlds. The RWBY characters would have to face opponents with different fighting styles from For Honor. This could lead to some interesting character development as they learn from each other and form new alliances.
One idea could be to have Apollyon cross over into a different time period within the For Honor universe. Maybe she finds herself in a more peaceful era and has to decide whether to disrupt it or adapt. Another could be a crossover with a character from another game where she has to battle for supremacy in a new and unfamiliar land.
There are also some For Honor fan communities on Discord. People often share their fanfictions there, including Viking crossovers. You can join these communities and ask if anyone has any recommendations. This way, you can get some hidden gems that might not be as easily found on the larger platforms.
One idea could be a story where the Warden is on a quest and gets injured. The Nobushi, who is initially an enemy, decides to help him out of a sense of honor. As they spend time together, they start to understand each other's cultures and values, and a bond forms between them.
Another interesting approach is to change the setting of the 'a matter of honor' story. For example, instead of the usual medieval - like setting, set it in a modern - day corporate world where honor in business deals and professional relationships becomes the central theme of the fanfiction. This can bring a whole new perspective to the concept of honor.
One possible plot could be Naruto and his friends being summoned to the world of For Honor. Naruto, with his ninja skills, could team up with the samurai and Vikings in For Honor. He might teach them some of his unique jutsu, like the Shadow Clone Jutsu to create diversions in battles. And in return, he could learn the combat styles of the For Honor warriors. They could then face a common enemy that threatens both the ninja world and the For Honor world.
One interesting concept could be the merging of Honor Harrington's universe with another well - known science fiction universe like Star Trek. Imagine Honor's naval tactics being applied in the context of the Federation's exploration and defense missions. Another concept might be a crossover with the Battlestar Galactica universe, where the Honorverse's ship - building technology could interact with the Cylons' advanced robotics.
Maybe a crossover with a magical anime. The nanbaka characters could suddenly find themselves in a world full of magic. Some of the nanbaka characters might be really good at using magic in unexpected ways, like Jyugo using his shackles in a magical battle.