Another theme is the idea of destiny. Often in these fanfictions, their being summoned together is seen as part of a greater destiny. For example, in some stories, they are meant to save a certain world or defeat a powerful enemy. It gives a sense of purpose to their relationship. Also, the theme of self - discovery is quite prevalent. As they face challenges together, they learn more about themselves and their own powers. This is especially true for Shirou as he often discovers new aspects of his abilities when paired with Arturia.
A great place to find 'naruto x arturia' fanfiction is Archive of Our Own (AO3). There are various works with different themes. Some fanfictions may be more action - packed, like battles against powerful foes. Others could be more character - study - like, delving into how Naruto and Arturia would view each other's cultures and values. You can also check the reviews and ratings to find the more popular and well - written ones.
A plotline might involve a magical or chakra - based accident that binds Naruto and Arturia together in some way. They have to figure out how to break the bond while also facing challenges that come their way. For example, they might be hunted by a group who wants to use their combined power for evil. In some fanfictions, there could also be a love triangle situation involving one of their friends or comrades from their respective worlds.
One plot idea could be that Arturia is summoned to the Naruto world during a great battle. Her skills and chivalrous code might shock the shinobi. She could team up with Naruto to fight a common enemy, like a powerful new Akatsuki member with some kind of magic - related power.
Well, in such a fanfic, perhaps Archer sacrifices his arm while saving Arturia from a great danger. Maybe it could be a powerful enemy attack and Archer jumps in the way, taking the brunt of it on his arm to protect Arturia. This would be a very heroic and selfless act on Archer's part.
One great 'arturia summons shirou fanfiction' is 'A Different Summoning'. It explores a unique take on their relationship when Arturia summons Shirou in an alternate scenario. The story is filled with interesting character interactions and a plot that keeps you hooked.
Well, another place to look could be Reddit. There are subreddits dedicated to fanfiction where users might share or recommend Naruto and Arturia fanfictions. Also, some Naruto or Fate (where Arturia is from) fan forums could be a good source. You might have to dig a bit, but you can often find some hidden gems there.
Perhaps in this fanfic, Archer's family is cursed. Archer, with his archery, has to go on a quest to find a way to break the curse. Arturia could join him on this journey. She might have some knowledge of magic or ancient spells that could be related to the curse. Along the way, they face many challenges and Archer uses his archery to fight off various threats to his family.
It could be that Archer's loss of an arm makes him more determined. He might start to train harder with his remaining abilities, and in the process, discover new skills. This could also make him more respected among his comrades. Arturia, on the other hand, might start to see Archer in a new light, not just as a fellow fighter but as someone she deeply cares about on an emotional level.
A good way is to establish a common ground. For instance, if both universes have a form of magic, find a way to make those magics interact. Maybe Arturia's magic can be seen as an ancient form that has been forgotten in the Harry Potter world. Another way is through character relationships. Harry could look up to Arturia as a mentor figure, learning from her noble and chivalrous ways.