The idea of destiny also plays a big role. In both Naruto and Fate Stay Night, destiny is a significant concept. In the fanfictions, it could be about whether Naruto characters can change the pre - determined fate in the Fate Stay Night world, or how the Fate Stay Night characters view the idea of 'becoming Hokage' which is Naruto's big goal.
Love and friendship are also common themes. The OC might form deep bonds with the existing characters from 'Fate Stay Night'. They could fall in love with a Servant or develop a strong friendship with a fellow master. In addition, the theme of destiny is often explored. The OC's presence might change the pre - ordained destiny of the 'Fate Stay Night' world, and they have to come to terms with the consequences of their actions on the overall fate of the story.
One common theme is the clash of different power structures. The magic and Servants of 'Fate Stay Night' against the vampiric powers in 'Hellsing'.
A frequent theme in these fanfictions is the exploration of new identities. Kirito, being in a different world, has to re - define himself, and the Fate characters also see him in a new light. Teamwork is another big theme. They have to work together to face the challenges of the Grail War or other threats in the Fate world. And of course, the theme of heroism. Kirito's heroic nature from Sword Art Online and the heroic ideals in Fate/stay night are often compared and combined in these stories. For example, in some fanfictions, Kirito takes on the role of a hero in the Grail War, much like the Servants in Fate/stay night.
The most common themes include the exploration of different cultures. Naruto has its own ninja culture, while Fate Stay Night has the mage and servant culture. Fanfics usually show how these two cultures clash and blend. Destiny is also a big theme. Given the importance of destiny in both series, in the fanfics, characters often question or try to change their fates. Moreover, self - discovery is a theme. Characters from both sides discover new aspects of themselves when exposed to the other world's situations and characters. This can lead to interesting character development throughout the fanfic.
One common theme is the clash of power systems. Since Naruto has chakra - based powers and Fate Stay Night has magic, seeing how these two different types of powers interact or conflict is often explored. For example, in many fanfics, Naruto might try to use his chakra to counter a magical attack from a Fate character.
One common theme is the exploration of Archer's complex personality. The OC often serves as a catalyst for this exploration. Another theme is the power dynamic between Archer and the OC, especially if the OC is a mage or has some special ability. Also, there's often a theme of redemption or self - discovery for Archer through his interactions with the OC.
One common theme is the exploration of their different ideals. Jeanne, being a saint, and Shirou, with his own sense of justice, often clash or come together in interesting ways. Another theme could be the idea of redemption. Maybe Shirou helps Jeanne in some way that makes her see a new side of herself or her purpose.
One common theme is friendship. Despite their different origins and personalities, Rin and Saber often develop a deep friendship in these fanfics. They learn to rely on each other and support one another through difficult times.
One common theme is power and its use. Since the self - insert character is often thrust into a world full of powerful mages and heroic spirits, they have to figure out how to use their own power or lack thereof. Another theme is identity. They need to establish who they are in this new world filled with pre - existing characters and storylines.
One common theme is the exploration of different magical systems. Since both Harry Potter and Fate Stay Night have their own complex magic, fanfictions often explore how these magics interact or compare. For example, how the spells in Harry Potter would fare against the magecraft in Fate Stay Night.