What are some interesting plot ideas for a Dr Fate crossover fanfiction?

One idea could be that the Servants from Fate are transported to the Halo universe. For example, Saber could find herself in a battle against the Covenant. Her noble phantasm could be a powerful weapon against the alien foes. Another plot could involve Master - Spartan team - pairings. A Spartan could be paired with a mage to fight a common enemy that threatens both the Halo and Fate worlds.

One idea could be that Naruto is summoned into the Fate universe during the Holy Grail War. He might be mistaken for a Servant at first. His unique ninja abilities would disrupt the normal flow of the war. For example, his Shadow Clone Jutsu could be used to confuse the enemy Masters and Servants.

For 'fate crossover fanfiction', you could consider a crossover with 'One Piece'. The Servants might be pirates or marines, sailing the Grand Line. A 'Fate' and 'Fullmetal Alchemist' crossover would also be cool. Picture Servants trying to solve the mysteries of alchemy. There's also potential in a 'Fate' and 'My Hero Academia' crossover, with Servants having Quirks.

Maybe a time - travel based crossover. A character from Fate Kaleid Liner accidentally travels back in time and meets the younger versions of other characters in the series. This could lead to changes in the timeline and they would have to work together to fix any potential disasters that their meeting has caused, all while trying to find a way back to their own time.

Maybe Arthur Pendragon gets transported to the Fate world and his presence disrupts the normal balance of power. The mages in the Fate universe might see him as a threat or an opportunity. He could end up being a wild card in the Grail War, not bound by the normal rules of Servant summoning. His noble phantasm, Excalibur, could be a game - changer in battles against other powerful Servants.

A possible plot for this crossover fanfiction could be centered around the concept of the 'ideal'. In Fate Stay, each Servant has an ideal they fight for, and in RWBY, the characters also have their own beliefs and goals. So, a story could be crafted where the characters from both universes have to compare and contrast their ideals. Maybe some of the Fate Stay characters are confused by the concept of the Grimm and the Huntsmen/Huntresses' role in RWBY, while the RWBY characters are intrigued by the Servant - Master relationship in Fate Stay.

A possible plot could be that Jack the Ripper's true identity in the fanfiction is actually a corrupted form of an otherwise noble Servant. Maybe he was a heroic figure in the past but was corrupted by a powerful dark magic. A group of Fate characters could then be on a quest to find a way to reverse this corruption. They would have to face not only Jack the Ripper's deadly attacks but also the political and social unrest in the London setting of the story. The fanfiction could also explore the psychological aspect of how the Ripper's mind works and how the Fate characters react to his extreme violence.

Maybe a character from Blue Exorcist gets summoned into the Fate universe by mistake. They then have to adapt to the new rules and magic there, and form alliances with the Fate characters to find a way back home. Along the way, they discover new aspects of their own powers.

One idea could be a crossover with 'My Hero Academia'. Characters from Dr Stone could gain quirks and have to navigate a world with both scientific challenges and superpowers. For example, Senku could use his scientific knowledge to analyze and perhaps even replicate quirks.

Well, in scp fate crossover fanfiction, there could be crossovers where the containment procedures of SCPs are challenged by the chaotic nature of the Fate universe. Some fics might explore the idea of SCPs being summoned as Servants, which would bring a whole new level of danger and unpredictability to the story. It could also involve the SCP Foundation trying to either use or stop the Holy Grail War depending on how they perceive it as a threat or an opportunity.