What are some interesting ideas for Fate Zero OC (Original Character) fanfiction?

You could create an OC who is a master of illusions. This character could use their powers to deceive both enemies and allies, and their backstory could involve being an outcast from their own illusionist clan because they refused to use their powers for evil. In the Re:Zero world, they could help Subaru by creating diversions during battles or by using illusions to uncover hidden truths.

One idea could be Naruto being summoned as a Servant in the Fate Zero world. His unique ninja abilities would make for an interesting dynamic against the traditional Servants. He could use his shadow clones to outnumber opponents or his Rasengan in combat.

One idea could be creating an OC who is a time - traveling mage from a forgotten era. They could have unique spells that interact strangely with the modern Fate world. Another is an OC who is a half - human, half - divine being, struggling with their identity in a world full of pure - blooded Servants and Mages. A third idea is an OC with the power to manipulate emotions, which causes chaos during the Holy Grail War as they can turn allies into enemies and vice versa.

One idea could be an OC who is a long - lost relative of Hawkeye. They show up in his life unexpectedly and have to navigate the world of superheroes together. Another could be an OC with a special power that complements Hawkeye's skills, and they team up to take on a new villain in town. Or perhaps an OC who is a journalist trying to expose Hawkeye's secret identity while also falling in love with his heroic persona.

An OC fanfiction could focus on a character who is an ordinary civilian at the start but gets caught in the middle of the chaos. They gradually develop their own survival skills and form an unlikely alliance with other survivors. Maybe they find a way to use the infected as a weapon against the real threats in the Prototype universe.

An OC who is a hacker-turned-legal -advisor for the firm. This character could have gotten into trouble in the past for their hacking skills but now uses them to help the lawyers dig up evidence and expose corporate wrongdoings in a legal way. They might also have a complex relationship with the IT department at the firm.

Some Fate Zero male OC fanfictions focus on an OC who is an outsider to the traditional mage families but has an extraordinary power. This power might be something that challenges the norms of the Grail War. He could introduce new concepts and ideas into the story, like a different way of viewing the Grail or a new form of magic that the other characters have to adapt to.

One idea could be to have the Servants from Fate Grand Order interact with the events and characters of Fate Zero in unexpected ways. For example, Mash could end up in the middle of the Fourth Holy Grail War and try to prevent some of the tragedies from happening. She might team up with a young Kiritsugu, using her knowledge from the future to guide him. Another could be that a Grand Order Servant like Artoria Alter gets involved in the war and changes the power dynamics completely, as her dark and powerful nature would be a wild card in the already complex Fate Zero setting.

One idea could be that the patient zero OC has a unique ability to heal others despite being the origin of a disease. This creates a moral dilemma within the story as people are both afraid and in need of their power.

One idea could be creating an OC who is a time - traveling mage from a future where the Grail Wars have had catastrophic consequences. This OC could be on a mission to change the past to prevent the disasters. Another idea is an OC that is a hybrid of a Servant and a human, with unique abilities and a complex backstory that ties into the existing lore of Fate Grand Order. Maybe an OC who was experimented on by the mages in Chaldea and gained strange powers as a result.