Well, for Assassin's Creed crossover fanfiction, you could do a crossover with 'Final Fantasy'. The different races and magic systems in Final Fantasy would make for an exciting backdrop for an Assassin's story. For example, an Assassin could be part of a group trying to stop a powerful Summoner from summoning a dangerous creature. Or a crossover with 'The Legend of Zelda'. The Assassin could be exploring Hyrule, using their parkour skills to traverse the vast landscapes and dungeons, and perhaps getting involved in the fight against Ganon.
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 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.
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 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.
One interesting idea could be exploring the backstory of a minor character in the game. For example, you could write about the early days of a random assassin in training, their struggles, and how they overcame them. Another idea is to create an alternate universe where the Templars and Assassins have a different kind of relationship, like a truce that changes the whole dynamic of the story. Or you could focus on a specific historical event that was only briefly touched upon in the games and expand it from an Assassin's Creed perspective.
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 possible plot could involve a group of ponies accidentally traveling to the Assassin's Creed world. They would be out of place and have to adapt quickly. They might team up with an Assassin to stop a powerful enemy. The ponies could use their unique magical abilities, like Rainbow Dash's speed or Fluttershy's ability to communicate with animals, to help the Assassin in their quest. And in return, the Assassin could teach the ponies about their history and fighting techniques.
Maybe there's a hidden Templar plot that has ties to a military case the NCIS is investigating. An Assassin discovers this connection and has to work with the NCIS agents, who are initially skeptical of this person with such strange abilities and knowledge. They gradually learn to trust each other as they uncover the Templar conspiracy together.
A great plot for Assassin's Creed 3 fanfiction could be an alternate ending. For example, what if Connor had managed to convince Haytham to join the Assassins? This would completely change the story's dynamic. Or, a story could be written about Connor's adventures in a different part of the world, like exploring Europe during the same time period. He could encounter new Assassins or Templars there and have to adapt his skills. Also, a fanfiction could center around the impact of Connor's actions on the future of the Assassin Brotherhood in America.
One idea could be creating an OC who is a descendant of a lesser - known historical figure involved in the Assassin - Templar conflict. For example, an OC descended from a local resistance leader during a particular era. Another idea is to have an OC with a unique skill set, like being able to communicate with animals which gives them an edge in stealth missions. Or an OC who is a double agent, initially thought to be a Templar but is actually an Assassin with a very complex backstory.