A third plot could be a time - travel - related story. Shirou somehow gets sent back in time and meets a younger Medusa. He has to navigate this new situation while also trying not to change the future too much. Along the way, they develop a bond that is different from their relationship in their original timeline.
One interesting plot could be Shirou and Medusa teaming up to face a powerful common enemy. Maybe an ancient evil that threatens the world they are in. They would combine their unique abilities, with Shirou's projection magic and Medusa's powerful combat skills and snake - based powers.
A plot could be centered around Shirou summoning Morgan to help him in a magical tournament. Morgan, being a powerful figure, has her own motives for participating. Along the way, Shirou discovers that Morgan has a connection to his past that he was unaware of. As they compete in the tournament, they face opponents who force them to work together and rely on each other's strengths, leading to a deeper understanding between them.
A really unique plot could be that Poseidon and Medusa's love is a way to bring about change in the world of the gods. Their union could be seen as a symbol of breaking free from the traditional norms. Medusa, with her unique powers, and Poseidon, with his vast influence over the seas, could team up to create a new era. However, they face many obstacles like the jealousy of other gods and the strict rules of the divine hierarchy.
There could be a fanfiction where Shirou Emiya discovers a long - lost family member who is also a powerful mage. The story could revolve around their relationship, how they learn from each other, and how they face challenges together. Or perhaps a plot where he has to use his powers to enter a magical realm and retrieve a powerful artifact to save his world from destruction.
A great plot might involve Medusa having a change of heart. For example, instead of being purely evil, she could be forced into her actions by some greater power. Percy then discovers this and has to decide whether to still fight her or help her. In a fanfic, this could add a whole new layer of moral complexity to their relationship. It could also lead to an alliance between them against a common enemy, which would be very different from the traditional view of their encounter.
One interesting plot could be Saber Lily and Shirou teaming up in the Camelot era to face a powerful, previously unknown threat. Maybe a dark sorcerer who is trying to corrupt the very essence of Camelot. They would have to rely on each other's strengths, with Shirou's determination and Saber Lily's combat skills.
Another plot could involve a love triangle where Shirou is caught between his feelings for Fem Gilgamesh and another character. This would add a layer of drama and conflict as he has to navigate his emotions and the complex relationship dynamics. Fem Gilgamesh, with her pride, would also have to face the idea of competing for Shirou's affection.
'Shirou and Medusa's Adventure' is a great one. It has an exciting plot where they embark on a quest to find a magical artifact that can save their world. The story does a good job of developing their relationship as they face various challenges together.
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.
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.
A possible plot is that Shirou as a girl gets caught up in a romantic sub - plot that was not possible before. For example, she might be the object of affection for a character who previously only saw her as a friend when she was male. Also, she could struggle with her identity, trying to hold on to the values she had as Shirou while adapting to her new physical form. This internal conflict could drive the story forward.