One common theme is the OC trying to fit into the chaotic world of Durarara. They often have to deal with the various gangs and strange characters. Another theme is the OC having some sort of special power or knowledge that changes the dynamics of the Durarara world. And sometimes, there's a theme of friendship or romance between the OC and the existing Durarara characters.
Another theme is the exploration of an unlikely relationship. Since Shizuo is such a complex and often violent character, seeing him interact with an original character creates a unique dynamic. It's about two different worlds colliding, like in some fics where the OC is from a completely different background than the Durarara world.
The theme of identity is often explored in durarara crossover fanfiction. For instance, when crossed with 'Psycho - Pass', the question of what defines a person in a society with strict moral evaluation (Psycho - Pass) and in the chaotic, diverse world of Durarara becomes a central point. Another common theme is the struggle for power. When combined with 'Attack on Titan', the fight for survival and power in both universes makes for a very engaging narrative.
Well, in transformers oc x oc fanfiction, one of the prevalent themes is self - discovery. These original characters are often in a world full of powerful and well - established transformers, and they have to figure out who they are and their place. Power struggles can also be a theme, as the ocs might be vying for a position or trying to prove themselves. Survival in the often - dangerous transformers' world is yet another common theme. For example, ocs might have to face off against powerful enemies or deal with the aftermath of a big battle.
One common theme is the mystery around Izaya. Female characters are often intrigued by his complex and somewhat devious nature. They might try to figure him out, which leads to interesting interactions.
One common theme is friendship. The OC often becomes a friend to Tigress and helps her grow as a character. Another theme is adventure. They might go on quests together in the Kung Fu Panda world.
Power is a common theme. Madara is extremely powerful, so often the oc either has to match his power level in some way or is in awe of it. For example, in some fictions, the oc might be a powerful ninja herself and they engage in epic battles together.
Often, there's the theme of protection. The oc could be a powerful character who protects Hinata from various threats in the Naruto universe. This can range from protecting her from other ninja clans to shielding her from the Akatsuki. And also, the theme of self - discovery. Hinata may discover new aspects of herself through her relationship with the oc. For example, she becomes more confident in her abilities.
One common theme is the exploration of power dynamics. Kaa is often depicted as a powerful and somewhat mysterious character, and the OC may be in a position where they are either at Kaa's mercy or trying to gain some sort of power from their relationship.
One common theme is adventure. The OC and Anko might go on various missions together, facing dangerous enemies and exploring new places. Another theme could be self - discovery. As the OC interacts with Anko, they learn more about themselves, their abilities, and their place in the ninja world.
One common theme is friendship. The oc often starts as a stranger to Mikasa and they gradually become friends, sharing their secrets and fears. For example, in many fics, they bond over their experiences with Titans.