Power-ups and new abilities are also a theme. Writers might give a character a new skill or a stronger version of their existing powers. For example, Shirou could discover a new way to project his weapons that gives him an edge in battle. And the theme of moral dilemmas often appears. Since the original work has complex moral issues, fanfiction can expand on these. Characters may face even tougher choices about using their powers and the consequences of their actions.
The theme of redemption is seen in some Unlimited Blade Works fanfiction. A character who made mistakes in the original might be given a chance to make amends. It could be a villain trying to turn good or a hero who has to atone for something they did wrong. This adds more depth to the characters and the overall story.
Love and relationships are also quite common. The OC might develop romantic relationships with the main characters or form deep friendships. This can add an emotional depth to the story. For example, an OC falling in love with Shirou could create a love triangle situation with Rin, adding drama to the plot.
The 'Alternate Universe' trope is very much used. For example, an alternate universe where the events of Unlimited Blade Works and Highschool DxD are intertwined from the start. Maybe the Grail War is a regular occurrence in the Highschool DxD world. Another trope is 'Identity Reveal'. A character might be hiding their true identity from one universe while in the other, and when it's revealed, it causes a stir. Also, the 'Forbidden Love' trope can be interesting. If there are rules against a relationship between a character from Unlimited Blade Works and one from Highschool DxD, like a magical or social taboo, it can create a lot of drama and tension in the fanfiction.
One popular plot twist could be a crossover of Percy Jackson characters with Unlimited Blade Works' magic system. For example, Percy discovers he can use magic in addition to his water powers. This would completely change the power dynamics in his battles and his relationships with other characters.
Well, a cool 'unlimited blade works crossover fanfiction' idea might involve crossing it with a sci - fi setting. For example, Shirou finds himself on a spaceship and has to use Unlimited Blade Works against alien threats. It could also be interesting to cross it with a historical - fiction world, like the samurai - era Japan. He could have duels with famous samurai using his blade - creating ability. And then there's the idea of crossing it with a magical girl universe. His serious and practical magic would be an interesting contrast to the more flamboyant magic of magical girls.
The plotlines in such fanfiction can vary greatly. Some might focus on alternate universes where the events of 'Unlimited Blade Works' take a different turn due to the actions of the OC. For instance, the OC could change the outcome of a battle, which then has a domino effect on the rest of the story. It could also explore new concepts that were not fully explored in the original work, like a different type of magic or a new backstory for a familiar location.
Another concept is the exploration of different timelines within the crossover. Maybe there's a timeline where Shirou makes different choices due to the influence of the crossover elements. This can lead to a whole new set of battles and relationships. Also, the combination of different magic systems from the crossovers can create really cool and unexpected effects in the story.
Perhaps in this fanfiction, Naruto enters the Unlimited Blade Works realm and has to face his own inner demons represented as clones within that world. This would be a great way to explore his character deeper as he battles his fears and insecurities.
One idea could be Izuku discovers he has the ability to use Unlimited Blade Works in a moment of extreme danger. He starts training with it secretly, trying to master the different blades and their unique powers.
Well, there could be a fanfiction where the OC user is a time - traveler who enters the Unlimited Blade Works. This OC might try to change certain events in the story. They could interact with the existing characters in unexpected ways, like teaching Archer a new combat technique that he then incorporates into his fighting style, which in turn affects the overall battles and relationships in the Unlimited Blade Works world.
One Piece's Luffy is also quite popular. His carefree and determined personality contrasts with the more serious tone of Unlimited Blade Works at times. His devil fruit powers can introduce some really wacky and interesting elements into the story. Additionally, characters like Goku from Dragon Ball Z are frequently used in crossovers. His super - strong fighting abilities and Saiyan heritage can lead to epic battles against the Servants in the Unlimited Blade Works world.