Love and loyalty are also quite common themes. Their relationship might start as a simple alliance but often evolves into something deeper. They develop loyalty towards each other, and in some fanfictions, it turns into a romantic love. This love can be tested through various obstacles like battles against other characters or differences in their beliefs, but they always find a way back to each other.
I've read 'Shirou and Caster's Adventure'. It's a really cool fanfiction where they go on a journey together. It shows how Shirou's ideals and Caster's magic can work in harmony. The author does a great job of building their relationship gradually throughout the story.
One common theme is the exploration of their different personalities. Shirou is often depicted as determined and self - sacrificing, while Jeanne is a strong and noble figure. Their interactions based on these traits are often explored.
Love and redemption can also be common themes. Ishtar may find a new side of herself through her relationship with Shirou, and Shirou might be able to help her in ways she didn't expect, leading to a form of redemption for her. It's often a very interesting dynamic.
One common theme is the exploration of their mutual growth. They often help each other become better versions of themselves. For example, Shirou's determination might inspire Mina to be more persistent in achieving her goals.
One common theme is the exploration of power dynamics. Since Shirou has his own set of abilities and Rider has hers, how they interact in terms of power is often explored. For example, in some fanfictions, Shirou may have to rely on Rider's more otherworldly powers in certain situations.
One common theme is the power of their bond. Whether it's facing a common enemy or just dealing with the challenges of their world, their relationship is central. Another theme could be self - discovery, as they often learn more about themselves through their interactions.
One common theme is the power dynamic. Saber is often a strong and noble figure, while Caster has his own unique magic abilities. Their interactions around power, whether it's sharing it, competing for it, or using it together, are often explored.
One common theme is probably the exploration of their relationship. Given their different backgrounds, how they interact and come to understand each other better can be a central theme.
One common theme is the exploration of loyalty. Shirou is often very loyal to his beliefs and Arturia, whether as a Lancer or not, has her own sense of loyalty. In these fanfictions, they might struggle with conflicting loyalties or find common ground in their loyalty to a cause. Another theme is the power of friendship or love that can develop between them, which often helps them overcome various challenges.
The theme of growth is also prevalent. Both characters usually develop throughout the story. Artoria might become more open and trusting, while Shirou could become stronger and more confident. This growth is often tied to their relationship, as they support and inspire each other in the fanfiction.