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 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.
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 a story where a character from 'Game of Thrones' is transported into the world of 'For Honor' and has to adapt to its combat styles. For example, Jon Snow finding himself in the middle of a battle in 'For Honor' and using his skills to survive. He might form alliances with the different factions in the game, much like he did in Westeros.
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.
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.
In a Naruto - For Honor fanfiction, the Akatsuki members could be a part of the story. They could form a sort of mercenary group within the For Honor world. Their unique abilities and personalities would make for interesting interactions with the native For Honor characters, like the Samurai and Vikings.
One idea could be an OC who is a scientist trying to uncover the secrets of dark matter and accidentally stumbles upon a portal related to it. Another could be an OC with special powers that are somehow connected to dark matter, like the ability to manipulate it in small ways. Maybe an OC who is from a different dimension where dark matter is more visible and they come to our universe to study it.
First, re - read the original work related to 'a matter of honor' to get a solid understanding of the characters, the world, and the concept of honor within it. Then, pick a starting point. It could be right after a major event in the original or a completely new scenario that still ties into the overall theme of honor.
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.
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.