In some 'dark shirou fanfiction', Shirou could be corrupted by an external force. Maybe a dark mage gets a hold of him and alters his perception of right and wrong. This could lead to him making choices that are completely against his original character, like joining forces with villains to gain more power.
One interesting 'dark shirou fanfiction' could be where Shirou's ideals take a twisted turn. He might start using his powers in a more self - serving way rather than for the good of others. For example, he could become obsessed with a particular goal and sacrifice those who oppose him without a second thought.
One plot idea could be Dark Shirou in a post - apocalyptic world where he uses his skills to survive and rule a small territory. Another could be his journey to find a way to reverse his dark transformation. Or a plot where he has to face his darker self in a psychological battle within his own mind.
One possible storyline could be Female Shirou finding herself in a magical tournament as the Dark Magician Girl. She has to use her newfound powers and skills to defeat opponents and prove herself. Along the way, she might make some unexpected allies and discover secrets about the magical world she's now a part of.
There could be a fanfiction where Archer and Shirou are transported to an alternate dimension. In this story, they must rely on each other more than ever as they face unfamiliar magic and challenges. The relationship between them could deepen as they discover new aspects of themselves and each other. Archer's cynicism might be softened by Shirou's unwavering ideals, creating a really engaging dynamic.
There are fanfictions where Shirou's ideals are tested in the Naruto universe. In this world full of ninjas, he might have to reevaluate his way of helping people. Maybe he gets involved in the conflict between the villages and tries to find a peaceful solution, using his unique abilities. It's fascinating to see how his character from the Fate series would interact with the Naruto characters.
A really cool shirou dragon blood fanfiction could be one where the dragon blood in Shirou has a mind of its own. It tries to take over his body at times, and Shirou has to constantly battle with it while also dealing with external threats to his city or friends. This internal and external conflict would make for a very engaging story.
A different miyu x shirou fanfiction could involve a time - travel element. Miyu accidentally travels back in time and meets a younger Shirou. They form an unlikely friendship that defies the laws of time. As they try to figure out how to get Miyu back to her own time, they develop feelings for each other that are both pure and full of wonder.
In some fanfictions, the story could revolve around Shirou's struggle to control the Book of Darkness. It might be a powerful and dangerous artifact, and Shirou has to face many challenges, both internal and external. He could be tempted by the dark power it holds while also trying to use it for good. This internal conflict can make for a very engaging story.
One interesting story could be where Shirou's gamer ability allows him to see stats in the real world. For example, he can see the 'health' and'strength' of people around him. This leads to him using this knowledge to help those in need, like identifying a sick person by their low 'health' stat and getting them medical help.
In some fanfictions, Shirou might have the power to instantly analyze game strategies. For example, he could quickly break down the mechanics of a complex RPG battle system and come up with the most effective way to win. This gives him an edge in in - game challenges.
There might be a fanfiction where the Dark Dark Fruit is the key to unlocking a hidden realm in the story's universe. The protagonist, having the Dark Dark Fruit, embarks on a journey to explore this realm, encountering strange creatures and uncovering secrets along the way. In this fanfiction, the author could play with the concept of darkness as not just a power, but also a source of mystery and discovery.