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.
Sure. 'Fate/Zero: Shirou's Perspective' is a great one. It offers a unique take on Shirou's role in the Fourth Grail War, showing his growth and internal struggles in a more detailed way compared to the original work.
If Shirou is the master in the Fourth Holy Grail War fanfic, the whole dynamic of the war would change. Shirou's strong sense of justice and his willingness to sacrifice himself would likely influence his actions as a master. He might not be as cut - throat as some of the other masters, but instead focus on protecting the innocent. This could lead to him making some very unorthodox decisions during the Grail War, like trying to negotiate with other masters instead of fighting them right away.
His character would become more assertive as a master. He'd have to take charge and make decisions quickly, which would be a change from his sometimes indecisive self. He'd also have to be more cunning to outwit the other masters.
Well, the 'holy grail war of shirou fanfiction' is all about taking the basic premise of the Holy Grail War from the original work and adding a unique spin with Shirou. For example, it might explore what would happen if Shirou had a different upbringing in the context of the Grail War. Maybe he has different ideals that change how he interacts with the other Masters and Servants. It can also be about exploring his relationships in more depth, like his connection with Saber in new and interesting ways.
First, you can give Shirou a new backstory. Maybe he has a different family history or a unique experience that shaped him. This will make his character more distinct. For instance, if he was raised in a different part of the world, his views on heroism might be different.
Another plot idea might be to focus on Shirou's internal struggle during the Grail War in more depth. Show how his ideals are tested not just in battle, but also in his interactions with other Masters and Servants. Maybe he has to make some really tough moral choices that could change the course of the war.
Some fanfictions might focus on Shirou's struggle with his ideals in a more extreme way. For example, he could face a situation where his ideal of being a hero for everyone conflicts with the reality of the Grail War, and he has to make difficult choices that really test his beliefs.
Shirou is obviously a main character. Often, Saber would still be a major part as well, since she has a strong connection with Shirou in the original story. Other Servants and Masters from the original Holy Grail War concept might also appear.
One interesting plot twist could be Shirou having a different Servant. Instead of the usual ones, he might summon a Servant from a completely different era or mythology, which changes the dynamics of the Grail War. For example, a Servant from an African mythology who has unique abilities that no one in the traditional Grail War has seen before.