I really like Batman Grail fanfics. They often add new and exciting elements to the Batman universe. Some of them explore the relationship between Batman and the Grail in really unique ways, like how the Grail's mystery might attract Batman's detective instincts.
A good Batman Grail fanfic should have a strong plot. It can't just be about Batman randomly finding the Grail. There needs to be a build - up, like clues leading him to it. For example, the Grail could be tied to a series of murders in Gotham.
Another approach might be through a diplomatic solution within the fanfic. If the Masters were to realize the futility and destruction of the Grail War, they could come together and decide to end it. This would likely involve complex character development and plot twists, such as a shared enemy or a greater good that they all come to recognize.
One ethical reason is the amount of innocent bystander harm. In a Grail War, the battles often take place in populated areas, endangering ordinary people. Stopping the war would prevent this needless endangerment.
A fanfic like this might start with Shiki's sudden summoning. He'd be confused at first, but then quickly adapt. His skills in combat, especially his ability to see the 'lines of death' on his opponents, would make him a formidable Master. He could encounter Servants from different mythologies and have to use his wits as much as his powers to survive in the war. For example, he might face a Servant with powerful magic and have to find a way to counter it using his unique perception.
Servants are also often main characters. For instance, Saber, with her noble and powerful presence. In the fanfic, she might have different relationships with other characters compared to the original. Her backstory and her connection to the Grail War are important elements that make her a main character.
The Legend of the Holy Grail had many options. One of the recommended novels was " The 100-fold Cultivation System Instantly Upgrades to 999 ". This novel described how the protagonist, Jiang Chen, obtained the 100-fold Cultivation System after crossing over to another world and became stronger through continuous upgrades. In addition, there was also the novel " Naruto Holy Grail System ". After the protagonist passed through the Naruto World, he obtained the Holy Grail System and used the Holy Grail Space to infinitely strengthen and increase his attributes. These two novels are about the legend of the Holy Grail. They can satisfy your reading needs.
One possible plot could be that with 49 servants, the Grail War becomes extremely chaotic. There could be multiple alliances and betrayals among the masters and servants. Maybe some servants with unique abilities form a group to try and change the rules of the Grail War, as they realize that with so many participants, the traditional way of winning the Grail might lead to too much destruction.
The relationships between the characters can also be an interesting concept. In the fanfic, characters who may not have interacted much in the original could form strong alliances or rivalries. It can show how different personalities clash or complement each other in unexpected ways.
One main theme is heroism. Shirou has his own concept of being a hero, and the fanfic often explores how he tries to uphold that in the chaotic Fourth Grail War. For example, he might face difficult choices where his idea of heroism is tested.