Another concept is to blend the Assassin's Creed creed and values with the ninja way in Naruto. Maybe a group of ninjas discover an ancient artifact similar to those in Assassin's Creed that holds some sort of power. They then have to protect it from other ninja clans as well as a secret organization similar to the Templars in Assassin's Creed. The ninjas could learn new fighting techniques inspired by the assassins, like using hidden blades in combination with their kunai.
One idea could be to have a character from the Assassin's Creed world end up in the Naruto universe. For example, an Assassin could be sent on a mission that somehow transports them to Konoha. They would have to adapt to the new world with its unique chakra system while still relying on their assassin skills like stealth and parkour. This could lead to interesting interactions with Naruto and his friends as they try to figure out where this strange newcomer is from.
One idea could be that Naruto is somehow transported to the world of Assassin's Creed Odyssey. He could use his ninja skills, like his shadow clones, in the combat system of Odyssey. Maybe he teams up with the assassins to fight against a common enemy, such as a powerful cult that has some similarities to the Akatsuki in Naruto.
One idea could be that Naruto, with his unique ninja skills, is somehow transported to the world of Assassin's Creed Syndicate. He might mistake the Assassins for a new type of ninja clan. He could then learn their ways of stealth and parkour, while also teaching them some of his jutsu. For example, his shadow clone jutsu could be used to create distractions during assassinations.
Another approach could be to create a scenario where the Assassins' Creed's hidden blade technology is discovered in the Black Lagoon world. Different factions in Black Lagoon would then fight over this new and dangerous weapon. A character like Rock could get caught in the middle, trying to prevent all - out war, while an Assassin tries to retrieve the technology to keep it from falling into the wrong hands.
A fanfiction could involve a character from Watch Dogs being drawn into the world of Assassin's Creed. Maybe they accidentally stumble upon an ancient Assassin's hideout while exploring an abandoned part of the city. There, they find artifacts and secrets that lead them on a journey to learn about the Assassins' ways and get involved in their age - old struggle against the Templars.
Another possibility is a time travel where the character goes to the era of Ezio Auditore but as an outsider. They might have to adapt to the Renaissance setting quickly while also trying to figure out how their presence could potentially change the events that Ezio is a part of. Maybe they are there to prevent a Templar plot that was never fully explored in the original games.
Another angle for a fanfic about Xenia could be her relationship with the protagonist. Perhaps they form an unlikely alliance based on mutual respect and a common goal. They could learn from each other's skills and experiences, and this could lead to a strong bond between them as they journey through the game's world together.
One idea could be that Naruto, with his ninja skills, gets transported to the Assassin's Creed world. He might mistake the Assassins for a new type of ninja. He could then start learning their ways, like using the hidden blade in combination with his own jutsu. Another plot could involve Naruto teaming up with an Assassin to take down a powerful enemy that is causing chaos in both the Naruto universe and the Assassin's Creed universe.
A really interesting plot would be if the Akatsuki from Naruto were somehow related to the Templars in Assassin's Creed. Maybe they share a common goal, or there's a power struggle between them. Or, imagine a scenario where Sasuke becomes an assassin. He already has the skills and the brooding personality. He could use his Sharingan to enhance his assassin abilities, like predicting enemy moves better.
It could be really exciting. Imagine the stealth and parkour skills from Assassin's Creed in the complex and dangerous world of Game of Thrones. For example, an assassin could use their skills to navigate the alleys of King's Landing or scale the walls of Winterfell. They might be involved in the power struggles, perhaps trying to assassinate a key figure to change the course of the political intrigue, just like in the games and the show.
One idea could be a story where Kassandra, during one of her adventures, stumbles upon a mysterious portal that leads her to the Underworld. There, she meets Hades. Hades is initially suspicious of her but soon realizes she has no ill intent. They could form an unlikely alliance to deal with a threat that endangers both the mortal world and the Underworld.