A prevalent theme is redemption. Sometimes the OC is there to redeem the Riddler from his villainous ways. Also, the theme of identity is common. The OC may be trying to find their own identity while being in the Riddler's world, or they may be helping the Riddler figure out his true self.
His relationship with other villains or heroes is also common. For example, his rivalry with Batman or possible alliances with other Gotham criminals. In Telltale Games' universe, this can be explored in unique ways. Fanfiction may show how the Riddler tries to gain an upper hand over Batman, or how he interacts with characters like Catwoman or Penguin in this particular game setting.
One common theme could be the exploration of the complex relationship between the two characters. Another might be the power dynamics.
A lot of 'Penguin x Riddler fanfiction' has the theme of power struggle. Since they are both strong - willed villains, they could be vying for control in Gotham's criminal hierarchy. And sometimes, there's a theme of unexpected friendship or partnership that develops between them in the face of common enemies.
One idea could be to explore the Riddler's origin story from the perspective of your original character (OC). Maybe your OC is a detective trying to solve the mystery of the Riddler's first crime spree. Another idea is to have your OC be a sidekick of the Riddler, either willingly or by being forced into it. They could then have a complex relationship where the OC tries to influence the Riddler's actions for better or worse.
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 power and its consequences. When an oc becomes a titan, they gain great power, and often the stories explore how they handle it. Another theme is identity. The oc has to figure out who they are now as a titan. And there's also the theme of acceptance, both self - acceptance and acceptance by others in the world of titans.
Survival is a very common theme. Since the Hunger Games setting is often used, both Katniss and the OC usually have to fight for their lives. Another theme is friendship. They form a bond in many stories which helps them get through difficult situations.
One common theme is friendship. Bolt often forms a strong bond with the OC, and they support each other through different situations. For example, they might face a villain together and rely on their friendship to overcome difficulties.
A common theme is mentorship. Often, the OC will be someone Giles takes under his wing, teaching them about the world of magic and mystery. For example, in many stories, Giles helps the OC understand their new - found powers.
A prevalent theme is self - discovery. Both John and the OC may learn things about themselves through their interactions. Also, the theme of acceptance can be seen. The fanfictions may show how the characters accept each other's differences, whether it's in abilities or personalities.