An interesting 'Assassin's Creed Crossover Fanfic' concept could be a crossover with the Legend of Zelda series. The Assassins could find themselves in Hyrule, using their climbing and stealth skills to traverse the land. They might have to work with Link to defeat Ganon, or they could be on a separate mission to retrieve a piece of Eden that has somehow ended up in Hyrule.
One idea could be a crossover with the Lord of the Rings universe. The Assassins could be sneaking around Middle - earth, using their skills to navigate the dangerous terrains and perhaps even facing off against the forces of Sauron. Another idea is a crossover with the Harry Potter world. Imagine an Assassin infiltrating Hogwarts, using their hidden blade to protect the wizarding world from dark forces that the wizards might not be able to handle with just magic.
For an Assassin's Creed crossover fanfic, consider a crossover with the Legend of Zelda series. The Assassins could explore the vast lands of Hyrule, facing off against Ganon's minions. They could learn some of the unique abilities and use the weapons in the Zelda world. Also, a crossover with the Pokemon world would be interesting. The Assassins might be on a quest to stop an evil organization that is misusing Pokemon for their own dark purposes, and they would have to catch and train Pokemon to help them in their journey.
One idea could be a crossover with the Witcher series. Kassandra or Alexios could meet Geralt in a world where the Isu technology has somehow intersected with the magic of the Witcher world. Maybe they team up to fight a common enemy that is using both magical and ancient technology to cause chaos. Another plot could involve a crossover with the Lord of the Rings universe. The hero from Assassin's Creed Odyssey could be transported to Middle - earth and get involved in the War of the Ring, using their combat skills and stealth abilities to help the Fellowship in unexpected ways.
A great Assassin's Creed crossover fanfiction idea is to cross it with 'Game of Thrones'. Picture an Assassin in Westeros, trying to navigate the complex web of political intrigue and assassination plots that are already rife in that world. They could be hired by different houses to carry out assassinations or be on a mission to uncover some dark secrets. Another interesting one could be a crossover with 'Cyberpunk 2077'. An Assassin in a high - tech future world, using their traditional skills along with new - age technology to take out targets in the neon - lit streets of Night City.
How about a crossover with the Star Wars galaxy? The Assassins could find themselves in a far - off planet in the Star Wars universe. They might get involved in the fight between the Jedi and the Sith, using their stealth and combat skills in a whole new environment filled with blasters, lightsabers and strange alien species.
One idea could be to explore the backstory of a minor character in the game. For example, a nameless assassin who has a unique skill but was never fully developed in the official story. Another could be to create an alternate timeline where the Templars and Assassins form an alliance against a greater threat.
One idea could be a crossover with Pirates of the Caribbean. The Assassin could team up with Jack Sparrow to find a hidden treasure that is also related to an ancient Piece of Eden. They'd face challenges like sea monsters and rival pirates.
You could write a fanfic about how the Syndicate interacts with other Assassin's Creed groups around the world. The Frye twins might receive a message from an Assassin cell in another country asking for help. This could involve traveling to a new location, facing new enemies, and learning about different Assassin traditions. It would expand the world of Assassin's Creed Syndicate and show how the fight against the Templars is a global one.
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.
A more character - driven plot could be about the relationship between Kassandra or Alexios and their family members. You could write a fanfic that delves deeper into their feelings towards their mother, father, or siblings. What if there was a secret that their family was hiding from them all along? This could add a whole new layer of drama and mystery to the story.