One common theme is the discovery of new powers. Often, the OC will have some sort of power or ability that they are either unaware of or are just learning to control, and Barry helps them with that. Another theme is love against all odds. Their relationship usually faces some sort of obstacle, like Barry's duties as The Flash or some external threat.
One idea could be that the Krypton OC has some unique powers due to their Kryptonian heritage that Barry Allen initially doesn't understand. For example, they might be able to manipulate a different form of energy that interacts strangely with the Speed Force. This could lead to a series of adventures where they have to figure out how to work together without their powers interfering with each other.
Barry Allen x Savitar fanfiction often plays with the idea of alternate universes. Writers may create scenarios where they are not enemies but rather allies or even something more. This can lead to interesting character developments. For example, Savitar's time - related powers combined with Barry's speed could be used in unique ways to solve problems or face new threats that were not present in the canon storyline.
Well, 'Barry Allen's Unlikely Bond' is a good 'barry allen x oc fanfiction'. In this story, the OC is a scientist who accidentally gets caught up in one of Barry's experiments. Their relationship starts off rocky but then evolves into a deep connection. There's also 'A Flash of a Different Kind' where the OC has a secret that could change everything between her and Barry.
One great Barry Allen OC fanfiction could be 'The Flash and the New Ally'. In this story, the original character might have some unique speed - related powers that complement Barry's. Another one could be 'Barry Allen and the Mysterious OC', where the OC has a connection to Barry's past that he doesn't know about. There are also stories like 'OC's Adventure with the Flash' which focus on the OC joining Barry in his battles and adventures in Central City.
It could start with Barry Allen noticing a strange energy signature in Central City. When he investigates, he finds the Krypton OC. The OC might be disoriented, having just arrived on Earth. Barry, being the hero he is, tries to help the OC understand where they are and what has happened.
There's also 'Barry's Unlikely Ally'. In this fanfic, the OC is from a different dimension and their encounter with Barry Allen leads to a series of exciting adventures. It's full of action and some really sweet moments between them.
Another theme is power exploration. Since Barry has his speed - based powers, the OC usually has some unique power too. The fanfics often explore how these powers interact, whether they complement each other or cause conflicts. For example, if the OC has a power related to time manipulation, it can create really interesting storylines when combined with Barry's speed. It can also lead to moral dilemmas about how to use their powers responsibly. And in some cases, the OC's power might be something completely new and different, like the ability to communicate with animals, which then leads to different kinds of adventures in Central City.
Typically, it focuses on the relationship between Barry Allen and the reader in a romantic and often more adult - themed way. It might include detailed descriptions of their interactions, emotions, and physical closeness.
The 'what - if' trope is quite prevalent in barry allen x savitar fanfiction. What if Savitar was never the villain? What if Barry and Savitar were friends from the start? These kinds of 'what - if' scenarios allow writers to rewrite their relationship and the entire story around them. Another trope could be the secret identity trope, where one or both of them hide their true identities from each other for a while during the development of their relationship.