One interesting concept could be a crossover with a fantasy world like Middle - earth. Imagine an assassin having to navigate the perils of Mordor while still maintaining their creed. Another concept might be a crossover with a historical event not directly related to the main Assassin's Creed timeline, such as the sinking of the Titanic, where assassins could be on board for a secret mission.
Writing a good Assassins Creed crossover fanfic is all about balance. You have to balance the elements of Assassin's Creed, like the hidden blade and the assassin's parkour skills, with the elements of the crossover. Let's say it's a crossover with a detective story. You can't overshadow the detective's investigation skills with the assassin's combat abilities. Also, create believable relationships between the characters. If an assassin teams up with a detective, there should be some initial mistrust that gradually turns into respect and cooperation as they work towards a common goal.
The main story of Assassin Creed Unity is set in Paris during the French Revolution. The player controls Arno Dorian, an assassin. He is on a journey to uncover the secrets behind the revolution and the Templar conspiracy, all while seeking revenge for the death of his adoptive father.
Well, Assassin's Creed begins with the first game that sets the foundation. Next is Assassin's Creed II, a fan - favorite. It has a great story set in Italy. After II, there's Brotherhood that expands on Ezio's story. Revelations follows Brotherhood in Ezio's tale. Then Assassin's Creed III jumps to a different time and place, the American Revolution. As the series progresses, each game's story is linked to the overall Assassin's Creed narrative in some way, whether it's through the Animus concept or the ongoing battle between Assassins and Templars.
The story in Assassin Creed Unity develops through Arno's exploration of Paris during the French Revolution. He meets different characters, some of whom help him and some who oppose him. His investigations into the Templar activities lead him to new locations and revelations. For example, as he digs deeper into the mystery of his father's death, he uncovers a web of lies and power struggles that shape the story's progression. He also has to adapt to the changing political situation in Paris, which affects his missions and the overall development of the plot.
There are many main storylines in Assassin's Creed. For example, in Assassin's Creed II, the story follows Ezio Auditore as he seeks revenge for his family's betrayal and murder. He gradually discovers the secrets of the Assassins and their fight against the Templars.
Well, one main plotline is the eternal struggle between the Assassins and the Templars. The Assassins fight for freedom and peace, while the Templars seek control. Another plotline often involves the search for powerful ancient artifacts. For example, in some games, they look for Pieces of Eden which have extraordinary powers.