Well, the theme of acceptance is quite common. They come from different backgrounds and have different personalities. Fanfics show how they accept each other's flaws and differences. Another theme is the power of hope. Their relationship gives them hope in a world full of chaos and danger. They see each other as a source of hope and motivation. And there's also the theme of the past haunting the present. Their past experiences, both good and bad, influence their relationship in the present, and fanfics often explore how they deal with these ghosts from the past.
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.
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.
One possibility is that it could explore their complex relationship. Since Shirou becomes Archer, he has a different perspective. He might be more jaded and less idealistic. With Arturia, their relationship could be filled with tension. Archer Shirou might initially push Arturia away, seeing his past self's naivete in her. But eventually, they could come to understand each other better. Their shared experiences in different timelines could also be a big part of the story, like how they both fought in the Holy Grail Wars but in different ways.
One common theme is the exploration of their relationship in a different gender dynamic. It could be a romantic relationship, where they navigate the feelings in a new way compared to their original male - female counterparts. Another theme is their individual character development as female characters, facing different challenges perhaps due to the change in gender in the Fate universe.
One common theme is the growth of their relationship. Whether it's from strangers to friends or from friends to something more, the development of their bond is often explored. Another theme could be adventure. They might be on a journey together, facing various challenges that test their relationship. Also, self - discovery is a theme sometimes. As they interact with each other, they learn more about themselves.
Love against all odds is also a frequent theme. Given their different origins and the circumstances they are in, fanfics often depict their love as something that has to overcome many obstacles, whether it be from other characters' disapproval or the chaos of the world they are in.
One common theme is the growth of their relationship. Starting from their initial interactions which might be a bit rocky, they gradually come to understand and care for each other more deeply. Another theme is their shared journey in the magical world. They face various challenges together, and this strengthens their bond.
One possible plot could be that Irisviel summons Archer Shirou in a world where Arturia already exists. Maybe Irisviel has a specific plan to use Archer's abilities to help Arturia in some great battle or quest. Archer might initially be reluctant to work with Arturia due to their past differences, but as the story progresses, they start to understand each other better and form a strong alliance.
One popular shirou x arturia fanfic is 'Avalon's Dream'. It beautifully weaves their relationship with elements from the Fate series lore. The story delves deep into their emotions and the challenges they face together. Another great one is 'Swordbound Hearts'. It focuses on their journey after the events of the main series, exploring how their bond grows stronger over time. There's also 'Fate's Bond' which is known for its detailed characterizations of both Shirou and Arturia, making their relationship feel very real and engaging.
The idea of sacrifice also pops up a lot. Given the nature of the Fate series, the characters may be in situations where they have to sacrifice for one another. In fanfics, this can be explored in different ways, like Saber sacrificing her power to protect Rin and Shirou.